UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
Form 10-K
Annual Report Pursuant to Section 13 or 15(d) of
the Securities Exchange Act of 1934
For the Fiscal Year Ended December 31, 20152018
Commission File Number 000-29187-87
Carrizo Oil & Gas, Inc.
(Exact name of registrant as specified in its charter) 
Texas 76-0415919
(State or other jurisdiction of
incorporation or organization)
 
(I.R.S. Employer
Identification No.)
  
500 Dallas Street, Suite 2300
Houston, Texas
 77002
(Principal executive offices) (Zip Code)
Registrant’s telephone number, including area code: (713) 328-1000
Securities Registered Pursuant to Section 12(b) of the Act:
Common Stock, $0.01 par value NASDAQ Global Select Market
(Title of class) (Name of exchange on which registered)
Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act.
YES  þ    NO  ¨
Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Exchange Act.
YES  ¨    NO  þ
Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    YES  þ    NO  ¨
Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).    YES  þ    NO  ¨
Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K is not contained herein, and will not be contained, to the best of registrant’s knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K.  ¨
Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer”filer,” “smaller reporting company,” and “smaller reporting“emerging growth company” in Rule 12b-2 of the Exchange Act. (Check one):
Large accelerated filer þ Accelerated filer¨
     
Non-accelerated filer¨ (Do not check if a smaller reporting company) Smaller reporting company¨
Emerging growth company¨
If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.  ¨
Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Act).    YES  ¨    NO  þ
At June 30, 2015,29, 2018, the aggregate market value of the registrant’s Common Stock held by non-affiliates of the registrant was approximately $2.4$2.2 billion based on the closing price of such stock on such date of $49.24.$27.85.
At February 19, 2016,22, 2019, the number of shares outstanding of the registrant’s Common Stock was 58,337,680.91,627,738.



 DOCUMENTS INCORPORATED BY REFERENCE
Portions of the definitive proxy statement for the Registrant’s 20162019 Annual Meeting of Shareholders are incorporated by reference in Part III of this Form 10-K. Such definitive proxy statement will be filed with the U.S. Securities and Exchange Commission not later than 120 days subsequent to December 31, 20152018.





TABLE OF CONTENTS
 
  
Forward-Looking Statements
PART I 
PART II 
Item 6. Selected Financial Data
PART III 
PART IV 



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Forward-Looking Statements
This annual report contains statements concerning our intentions, expectations, projections, assessments of risks, estimations, beliefs, plans or predictions for the future, objectives, goals, strategies, future events or performance and underlying assumptions and other statements that are not historical facts. These statements are “forward-looking statements” within the meaning of the Private Securities Litigation Reform Act of 1995. These forward-looking statements include, among others, statements regarding:
our growth strategies;
our ability to explore for and develop oil and gas resources successfully and economically;
our estimates and forecasts of the timing, number, profitability and other results of wells we expect to drill and other exploration activities;
our estimates, guidance and forecasts, including those regarding timing and levels of production;
changes in working capital requirements, reserves, and acreage;
the use of commodity derivative instruments to mitigate the effects of commodity price risk management activities and the impact onvolatility for a portion of our average realized prices;forecasted sales of production;
anticipated trends in our business;
availability of pipeline connections and water disposal on economic terms;
effects of competition on us;
our future results of operations;
profitability of drilling locations;
our liquidity and our ability to finance our exploration and development activities, including accessibility of borrowings under our revolving credit facility, our borrowing base, modification to financial covenants and the result of any borrowing base redetermination;
our planned expenditures, prospects and capital expenditure plan;
future market conditions in the oil and gas industry;
our ability to make, integrate and develop acquisitions and realize any expected benefits or effects of completedany acquisitions or the timing, final purchase price, financing or consummation of any acquisitions;
possible future divestitures or disposition transactions and the proceeds, results or benefits of any such transactions, including the timing thereof;
the benefits, effects, availability of and results of new and existing joint ventures and sales transactions;
our ability to maintain a sound financial position;
receipt of receivables drilling carry and proceeds from sales;divestitures;
our ability to complete planned transactions on desirable terms; and
the impact of governmental regulation, taxes, market changes and world events.
You generally can identify our forward-looking statements by the words “anticipate,” “believe,” budgeted,” “continue,” “could,” “estimate,” “expect,” “forecast,” “goal,” “intend,” “may,” “objective,” “plan,” “potential,” “predict,” “projection,” “scheduled,” “should,” or other similar words. Such statements rely on assumptions and involve risks and uncertainties, many of which are beyond our control, including, but not limited to, those relating to a worldwide economic downturn, availability of financing, our dependence on our exploratory drilling activities, the volatility of and changes in oil and gas prices, the need to replace reserves depleted by production, impairments of proved oil and gas properties, operating risks of oil and gas operations, our dependence on our key personnel, factors that affect our ability to manage our growth and achieve our business strategy, results, delays and uncertainties that may be encountered in drilling, development or production, interpretations and impact of oil and gas reserve estimation and disclosure requirements, activities and approvals of our partners and parties with whom we have alliances, technological changes, capital requirements, the timing and amount of borrowing base determinations (including determinations by lenders)redeterminations and availability under our revolving credit facility, evaluations of us by lenders under our revolving credit facility, waivers or amendments under our revolving credit facility in connection with acquisitions, other actions by lenders and holders of our capital stock, the potential impact of government regulations, including current and proposed legislation and regulations related to hydraulic fracturing, oil and natural gas drilling, air emissions and climate change, regulatory determinations, litigation, competition, the uncertainty of reserve information and future net revenue estimates, failure to realize the anticipated benefits of an acquisition, market conditions


and other factors affecting our ability to pay dividends on or redeem our preferred stock, integration and other acquisition risks, other factors affecting our ability to reach agreements or complete acquisitions or divestitures, actions by seller and buyers, effects of purchase price adjustments, availability of equipment and crews, actions by midstream and other industry participants, weather, our ability to obtain permits and licenses, the results of audits and assessments, the failure to obtain certain bank and lease consents, the existence and resolution of title defects, new taxes and impact fees, delays, costs and difficulties relating to our joint ventures, actions by joint venture parties, results of exploration activities, the availability, market conditions and completion of land acquisitions and dispositions, costs of oilfield services, completion and connection of wells, and other factors detailed in this annual report.

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We have based our forward-looking statements on our management’s beliefs and assumptions based on information available to our management at the time the statements are made. We caution you that assumptions, beliefs, expectations, intentions and projections about future events may and often do vary materially from actual results. Therefore, we cannot assure you that actual results will not differ materially from those expressed or implied by our forward-looking statements.
Some of the factors that could cause actual results to differ from those expressed or implied in forward-looking statements are described under Part I, “Item 1A. Risk Factors” and in, other sections of this annual report.report, and in our other filings with the SEC. Should one or more of these risks or uncertainties materialize, or should underlying assumptions prove incorrect, actual outcomes may vary materially from those indicated. All subsequent written and oral forward-looking statements attributable to us or persons acting on our behalf are expressly qualified in their entirety by reference to these risks and uncertainties. You should not place undue reliance on our forward-looking statements. Each forward-looking statement speaks only as of the date of the particular statement, and, except as required by law, we undertake no duty to update or revise any forward-looking statement.
Certain terms used herein relating to the oil and gas industry are defined in “Glossary of Certain Industry Terms” included under Part I, “Item 1. Business.”

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PART I
Item 1. Business
General Overview
Carrizo Oil & Gas, Inc. is a Houston-based energy company which, together with its subsidiaries (collectively, “Carrizo,” the “Company” or “we”), is actively engaged in the exploration, development, and production of crude oil, NGLs, and natural gas primarily from resource plays located in the United States. Our current operations are principally focused in proven, producing oil and gas plays primarily in the Eagle Ford Shale in South Texas and the Permian Basin in West Texas.
Significant Developments in 2018
Acquisitions. On October 17, 2018, we closed on the acquisition with Devon Energy Production Company, L.P. (“Devon”), a subsidiary of Devon Energy Corporation, of oil and gas properties in the Delaware Basin in WestReeves and Ward counties, Texas (the “Devon Acquisition”). The estimated aggregate purchase price of $196.6 million remains subject to post-closing adjustments.
Divestitures. In the Utica Shalefirst quarter of 2018, we closed on divestitures of substantially all of our assets in Ohio, the Niobrara Formation and a portion of our assets in Coloradothe Eagle Ford for aggregate net proceeds of approximately $381.3 million. In addition, we could receive contingent consideration of $5.0 million per year if crude oil prices exceed specified thresholds for each of the years of 2018 through 2020 as part of the Niobrara Formation divestiture.
On July 11, 2018, we closed on the divestiture of certain non-operated assets in the Delaware Basin for aggregate net proceeds of $30.9 million.
See “Note 3. Acquisitions and Divestitures of Oil and Gas Properties” of the Marcellus Shale in Pennsylvania.Notes to our Consolidated Financial Statements for further discussion.
The Company achieved record totalLiquidity and financings. On August 17, 2018, we completed a public offering of 9.5 million shares of our common stock at a price per share of $22.55. We used the proceeds of $213.7 million, net of offering costs, to fund the Devon Acquisition and for general corporate purposes.
We also redeemed the remaining $450.0 million aggregate principal amount outstanding of 7.50% Senior Notes due 2020 (the “7.50% Senior Notes”) and 50,000 shares of our 8.875% redeemable preferred stock (the “Preferred Stock”), representing 20% of the then issued and outstanding Preferred Stock.
During 2018, the borrowing base under our revolving credit facility increased from $830.0 million to $1.3 billion, primarily as a result of our continued development of our Eagle Ford and Delaware Basin assets. As of December 31, 2018, our elected commitment amount under our borrowing base was $1.1 billion.
See “Note 6. Long-Term Debt” and “Note 10. Shareholders’ Equity” of the Notes to our Consolidated Financial Statements for further discussion.
Production. Crude oil production in 20152018 was 38,992 Bbls/d, an increase of 13.4 MMBoe, a 12% increase from 2014,13% despite significantly lower capital expendituresthe divestitures in 2015 whenNiobrara and Eagle Ford in the first quarter of 2018, as compared to 2014. 34,428 Bbls/d in 2017, primarily driven by strong performance from our new wells in the Eagle Ford and Delaware Basin. Total production in 2018 was 60,382 Boe/d, an increase of 12% from 53,805 Boe/d in 2017, primarily due to the same reasons discussed above. See “—Summary of 2018 Proved Reserves, Production and Drilling by Area” for further discussion.


Proved reserves. At year-end 2015,2018, our proved reserves of 170.6329.4 MMBoe were 64% consist of 55% crude oil, 12%21% natural gas liquids and 24% natural gas. Our reserves increased 67.7 MMBoe, or 26%, from our year-end 2017 proved reserves of 261.7 MMBoe primarily as a result of our ongoing drilling program in the Eagle Ford.
Ford and the Delaware Basin. The following table provides details about the Company’sis a summary of our proved reserves as of the dates indicated.December 31, 2018 and 2017. See “—Additional Oil and Gas Disclosures—Proved Oil and Gas Reserves” for further discussion.
  Proved Reserves
  December 31, 2018 December 31, 2017
Region (MMBoe)
Eagle Ford (1)
 149.1
 167.0
Delaware Basin 180.3
 90.9
Other (2)
 
 3.8
Total 329.4
 261.7
(1)Included in the December 31, 2017 proved reserves are 10.9 MMBoe associated with a portion of our assets in the Eagle Ford that were divested in January 2018.
(2)In January 2018, we closed on the divestiture of substantially all of our Niobrara assets.
  Proved Reserves
  December 31, 2015 December 31, 2014
  (MMBoe)
Eagle Ford 144.0
 122.5
Delaware Basin 1.0
 
Utica 1.9
 0.6
Niobrara 3.9
 5.6
Marcellus 19.8
 22.3
Other 
 0.1
Total 170.6
 151.1
Recent Developments
Contingent consideration arrangements. For the year ended December 31, 2018, the specified pricing thresholds related to the Contingent ExL Consideration, the Contingent Niobrara Consideration, and the Contingent Utica Consideration (each as defined in “Note 3. Acquisitions and Divestitures of Oil and Gas Properties” of the Notes to our Consolidated Financial Statements) were exceeded. As a result, in January 2019, we paid $50.0 million and received $10.0 million from settlement of these contingent consideration arrangements. See “Note 12. Derivative Instruments” of the Notes to our Consolidated Financial Statements for further discussion.
2019 Drilling, completion, and infrastructure (“DC&I”) capital expenditure plan.Our 20162019 DC&I capital expenditure plan is currently includes $270.0$525.0 million to $290.0 million for drilling and completion and $15.0 million for leasehold and seismic. This plan represents a decrease of approximately 46% from our 2015 capital expenditures and reflects our strategy of controlling capital costs and maintaining financial flexibility$575.0 million. The assumptions in a low commodity price environment. We currently expect to commit the majority of our 20162019 DC&I capital expenditure plan include an expectation that we will achieve an improvement in capital efficiency relative to the continued exploration2018 resulting from a combination of service cost reductions, efficiency gains, and development of our properties in the Eagle Ford, andchanges to a lesser extent, the Delaware Basin.completion techniques that have already been implemented. We intend to finance our 20162019 capital expenditure plan primarily from cash flow from operations and our senior secured revolving credit facility as well as other sources described in “Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations—Liquidity and Capital Resources.” Our capital expenditure plan has the flexibility to adjust, should the commodity price environment change.
The table below summarizesfollowing is a summary of our actual capital expenditures for 20152018 and our planned capital expenditures for 2016:2019:
  Capital Expenditures
  2016 Plan 2015 Actual
  (In millions)
Drilling and completion    
Eagle Ford 
$260.0
 
$393.9
Other 20.0
 101.8
Total drilling and completion (1) 280.0
 495.7
Leasehold and seismic 15.0
 48.5
Total 
$295.0
 
$544.2
  Capital Expenditures
  
2019 Plan (1)
 2018 Actual
  (In millions)
DC&I    
Eagle Ford 
$325.0
 
$522.9
Delaware Basin 225.0
 321.2
Other 
 0.3
Total DC&I 550.0
 844.4
Leasehold and seismic (2)
 
 22.4
Total (3)
 
$550.0
 
$866.8
 
(1)Represents the midpoint of our 2016 drilling and completion2019 DC&I capital expenditure plan of $270.0$525.0 million to $290.0$575.0 million.
(2)We do not provide guidance for leasehold and seismic capital expenditures given the discretionary nature of this spending.
(3)Our capital expenditure plan and the actual capital expenditures exclude acquisitions of oil and gas properties, capitalized general and administrative expense, interest expense and asset retirement costs.
Business Strategy
Our objective is to increase value through the execution of a business strategy focused on organic growth primarily through the drillbit and opportunistic acquisitions of oil and gas properties, while maintaining a sound financial position to provide liquidity to weather a prolonged downturn in commodity prices. Key elements of our business strategy include:
Maintain our financial flexibility. We are committed to preserving our financial flexibility. We have historically funded our capital program with a combination of cash generated from operations, proceeds from the sale of assets, proceeds

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from sales of securities, borrowings under our revolving credit facility and proceeds, payments or carried interest from our joint ventures.
Control operating and capital costs. We emphasize efficiencies to lower our costs to find, develop and produce our oil and gas reserves. This includes concentrating on our core areas, which allows us to optimize drilling and completion techniques as well as benefit from economies of scale. In addition, as we operate a significant percentage of our properties as well as maintain a minimal level of drilling commitments in order to hold acreage, the majority of our capital expenditure plan is discretionary, allowing us the ability to reduce or reallocate our spending in response to changes in market conditions. For example, we have reduced our 2016 capital expenditure plan by approximately 46% from our 2015 capital expenditures, which reflects our strategy of focusing on low-cost oil and condensate resource plays and maintaining financial flexibility in a low commodity price environment.
Manage risk exposure. We seek to limit our financial risks, in part by seeking well-funded partners to ensure that we are able to move forward on projects in a timely manner. We also attempt to limit our exposure to volatility in commodity prices by actively hedging production of crude oil. Our current long-term strategy is to manage exposure for a substantial, but varying, portion of forecasted production to achieve a more predictable level of cash flows to support current and future capital expenditure plans.
Pursue opportunities to expand core positions. We pursue a growth strategy in crude oil plays primarily driven by the attractive relative economics associated with our core positions. By focusing on and implementing this strategy, our crude oil production as a percentage of total production has increased from 3% for the year ended December 31, 2010 to 63% for the year ended December 31, 2015. Nearly 100% of our 2016 drilling and completion capital expenditure plan is directed towards opportunities that we believe are predominantly prospective for crude oil development. We continue to focus our capital program on resource plays where individual wells tend to have lower risk, such as our operations in the Eagle Ford. Additionally, we continue to take advantage of opportunities to expand our core positions through leasehold acquisitions as evidenced by our acquisition of bolt-on acreage in certain of our core plays during 2015.
Utilize our experience as a technical advantage. We believe we have developed a technical advantage from our extensive experience drilling over 800 horizontal wells in various resource plays, including the Eagle Ford, Delaware Basin, Utica, Niobrara, Marcellus, and previously, the Barnett, which has allowed our management, technical staff and field operations teams to gain significant experience in resource plays and create highly efficient drilling and completion operations. We now leverage this advantage in our existing, as well as any prospective, shale trends. We plan to focus substantially all of our capital expenditures in these resource plays, particularly during 2016, in the Eagle Ford and, to a lesser extent, the Delaware Basin.
Our Competitive Strengths
We believe we have the following competitive strengths that will support our efforts to successfully execute our business strategy:
Financial flexibility to withstand prolonged low commodity prices. We maintain a financial profile that provides operational flexibility, and our capital structure provides us with the ability to execute our business plan. As of December 31, 2015, we had no outstanding borrowings under our $685.0 million revolving credit facility, have no near-term debt maturities, and use commodity derivative instruments to reduce our exposure to commodity price volatility for a substantial, but varying, portion of our forecasted oil and gas production. We believe that we have the ability and financial flexibility to fund the planned development of our assets through 2016. See “Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations—Liquidity and Capital Resources” for further details.
Operational control. As of December 31, 2015, we operated approximately 90% of the wells in Eagle Ford in which we held an interest. We held an average interest of approximately 88% in these operated wells. Our significant operational control, as well as our manageable leasehold obligations, provides us with the flexibility to align capital expenditures with cash flow and control our costs as we transition to an advanced development mode in key plays. As a further result of our operational control, we are generally able to adjust drilling plans in response to changes in commodity prices.
Large inventory of oil-focused drilling locations. We have developed a significant inventory of future oil-focused drilling locations, primarily in our well-established positions in the Eagle Ford, Niobrara, and Utica, as well as our recent entrance into the Delaware Basin. As of December 31, 2015, we owned leases covering approximately 291,606 gross (165,472 net) acres in these areas. See “—Acreage Data” for further details. Approximately 55% of our estimated proved reserves at December 31, 2015 were undeveloped.
Successful drilling history. We follow a disciplined approach to drilling wells by applying proven horizontal drilling and hydraulic fracturing technology. Additionally, we rely on advanced technologies, such as 3-D seismic and micro-

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seismic analysis, to better define geologic risk and enhance the results of our drilling efforts. Our successful drilling program has significantly de-risked our acreage positions in key resource plays.
Experienced management and professional workforce. Our management has executed multiple joint ventures, transitioned our focus to oil by entering new plays and completed non-core asset sales. We have an experienced staff, both employees and contractors, of oil and gas professionals, including geophysicists, petrophysicists, geologists, petroleum engineers, production and reservoir engineers and technical support staff. We believe our experience and expertise, particularly as they relate to successfully identifying and developing resource plays, is a competitive advantage.
Exploration and Operation Approach
Our exploration strategy in our shale resource plays has been to accumulate significant leasehold positions in areas with known shale thickness and thermal maturity in the proximity of known or emerging pipeline infrastructures. A component of our exploration strategy is to first identify and acquire surface tracts or “well pads” from which multiple wells can be drilled. We then seek to acquire contiguous lease blocks in the areas immediately adjacent to these well pads that can be developed quickly. If conditions warrant, we next acquire 3-D seismic data over these leases to assist in well placement and development optimization. Finally, we form drilling units and utilize sophisticated horizontal drilling, multi-stage simultaneous hydraulic fracturing programs and micro-seismic techniques designed to maximize the production rate and recoverable reserves from a unit area.
Primarily due to the depressed levels of oil and natural gas prices, we sometimes seek to reduce costs by deferring drilling or completion activity or drilling more wells on units where we hold a lower working interest than our historic average. In addition, we have historically sought to enter into joint ventures with well-funded partners that will pay a disproportionate share of the drilling and completion costs of wells that we drill.
In certain instances we may also seek to maximize the acreage that we can hold by drilling and producing by temporarily drilling fewer wells on each drilling unit in order to permit us to develop more drilling units with comparatively fewer rigs. Where possible, we also seek to maximize our liquidity, while increasing profitability of our projects through timing the completion and pipeline connection costs of our horizontal wells to coincide with periods of lower services costs.
We strive to achieve a balance between acquiring acreage, seismic data (2-D and 3-D) and timely project evaluation through the drillbit to ensure that we minimize the costs to test for commercial reserves while building a significant acreage position. Our first exploration wells in these trends are frequently vertical wells, or a limited number of horizontal wells, because they allow us to evaluate thermal maturity and rock property data, while also permitting us to test various completion techniques without incurring the cost of drilling a substantial number of horizontal wells. As discussed above, our primary focus is on crude oil to take advantage of what we believe are the attractive relative economics associated with this commodity.
We maintain a flexible and diversified approach to project identification by focusing on the estimated financial results of a project area rather than limiting our focus to any one method or source for obtaining leads for new project areas. Additionally, we monitor competitor activity and review outside prospect generation by small, independent “prospect generators.” We complement our exploratory drilling portfolio through the use of these outside sources of prospect generation and typically retain operator rights. Specific drill-sites are typically chosen by our own geoscientists or, in environmentally sensitive areas, are dictated by available leases.
Our management team has extensive experience in the development and management of exploration and development projects. We believe that the experience we have gained in the Eagle Ford, Niobrara, Marcellus and Barnett, along with our extensive experience in hydraulic fracturing and horizontal drilling technologies and the experience of our management in the development, processing and analysis of 3-D projects and data, will play a significant part in our future success.
We generally seek to obtain operator rights and control over field operations, and in particular seek to control decisions regarding 3-D survey design parameters and drilling and completion methods. As of December 31, 2015, we operated 474 gross (315.3 net) productive oil and gas wells. We generally seek to control operations for most new exploration and development, taking advantage of our technical staff's experience in horizontal drilling and hydraulic fracturing. For example, during 2015, we operated 71 of the 76 gross wells drilled in the Eagle Ford where we spent approximately 80% of our 2015 drilling and completion capital expenditures.
Working Interest and Drilling in Project Areas
The actual working interest we will ultimately own in a well will vary based upon several factors, including the risk of each well relative to our strategic goals, activity levels and capital availability. From time to time some fraction of these wells may be sold to industry partners either on a prospect by prospect basis or a program basis. In addition, we may also contribute acreage to larger drilling units thereby reducing prospect working interest. We have, in the past, retained less than 100% working interest in

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our drilling prospects. References to our interests are not intended to imply that we have or will maintain any particular level of working interest.
Summary of 20152018 Proved Reserves, Production and Drilling by AreaRegion
  Eagle Ford Niobrara Utica Marcellus 
Delaware Basin
& Other
 Total
Proved reserves by product                        
Crude oil (MMBbls) 105.8 2.8 0.6  0.4 109.6
NGLs (MMBbls) 19.0 0.5 0.4  0.3 20.2
Natural gas (Bcf) 115.4 3.4 5.4 118.8 1.9 244.9
Total proved reserves (MMBoe)144.0 3.9 1.9 19.8 1.0 170.6
            
Proved reserves by classification (MMBoe)         
Proved developed 52.4 3.5 1.9 17.2 1.0 76.0
Proved undeveloped 91.6 0.4  2.6  94.6
Total proved reserves 144.0 3.9 1.9 19.8 1.0 170.6
             
Percent of total reserves 84% 2% 1% 12% 1% 100%
                         
2015 production (MMBoe) 9.6 1.1 0.5 2.1 0.1 13.4
             
Percent of total production 71% 8% 4% 16% 1% 100%
                         
  Eagle Ford Niobrara Utica Marcellus 
Delaware Basin
& Other
 Total
Operated Well Data Gross Net Gross Net Gross Net Gross Net Gross Net Gross Net
Year Ended December 31, 2015                    
Wells drilled 71 65.1 13 7.5     4 3.6 88 76.2
Wells brought on production 67 60.1 11 5.8 2 1.7   2 1.7 82 69.3
                         
As of December 31, 2015                    
Wells waiting on completion 29 27.3 9 5.2   11 4.3 2 1.9 51 38.7
Wells producing 263 230.8 123 53.4 4 3.1 82 26.3 2 1.7 474 315.3
  Eagle Ford Delaware Basin Total
Proved reserves            
Crude oil (MBbls)   110,907
   68,829
   179,736
NGLs (MBbls)   19,183
   49,940
   69,123
Natural gas (MMcf)   114,092
   368,969
   483,061
Total proved reserves (MBoe)   149,105
   180,264
   329,369
       
Proved reserves by classification (MBoe)        
Proved developed   74,999
   55,900
   130,899
Proved undeveloped   74,106
   124,364
   198,470
Total proved reserves (MBoe)   149,105
   180,264
   329,369
       
Percent of proved developed reserves   57%   43%   100%
Percent of proved undeveloped reserves 

 37% 

 63%   100%
Percent of total reserves   45%   55%   100%
             
Production volumes Total Per Day Total Per Day Total Per Day
Crude oil (MBbls and Bbls/d) 10,655
 29,192
 3,534
 9,682
 14,232
 38,992
NGLs (MBbls and Bbls/d) 1,575
 4,316
 2,118
 5,802
 3,701
 10,139
Natural gas (MMcf and Mcf/d) 8,941
 24,495
 15,604
 42,751
 24,639
 67,503
Total production volumes 13,721
 37,591
 8,252
 22,609
 22,040
 60,382
       
Percent of total production   62%   38%   100%
             
  Eagle Ford Delaware Basin Total
Operated Well Data Gross Net Gross Net Gross Net
Year Ended December 31, 2018            
Drilled 100
 94.4
 31
 24.1
 131
 118.5
Completed 92
 81.5
 25
 20.1
 117
 101.6
             
December 31, 2018            
Drilled but uncompleted 39
 38.7
 11
 9.0
 50
 47.7
Producing 534
 479.4
 80
 69.7
 614
 549.1
Regional Overview
Eagle Ford Shale
TheFor 2018, the Eagle Ford isremained our most significant operational area. Our core Eagle Ford properties are located in LaSalle County and, to a lesser extent, in McMullen, Frio and Atascosa counties in Texas. As of December 31, 2015,2018, we held interests in approximately 107,02191,770 gross (82,670(76,462 net) acres and were operating two rigsacres. In the first quarter of 2018, we closed on the sale of a portion of our assets in the Eagle Ford.Ford to EP Energy E&P Company, L.P. for aggregate net proceeds of $245.7 million. Excluding 1.3 MMBoe of production in 2017 from the divested assets, total Eagle Ford production increased approximately 10% over the year ended December 31, 2017. In 2018, we spent approximately $522.9 million in the Eagle Ford, which was approximately 19% above our 2018 DC&I capital expenditure plan for the Eagle Ford, due to our decision to shift capital to the Eagle Ford to take advantage of the superior returns that were offered from the play and avoid aggressively developing our Delaware Basin inventory during a period of weak local market pricing. We currently plan for approximately 93%59% of our 2016 drilling and completion2019 DC&I capital expenditure plan to be directed towards opportunities in the Eagle Ford. We are testing multiple initiatives aimed at increasing our drilling inventory in the Eagle Ford. We are pleased with the performance of our 330-ft. downspacing tests in the Eagle Ford and are working on initiatives for further downspacing.
GAIL Joint Venture. In September 2011, we entered into joint venture arrangements with GAIL GLOBAL (USA) INC. (“GAIL”), a wholly owned subsidiary of GAIL (India) Limited. Under this arrangement, GAIL acquired a 20% interest in certain oil and gas properties in the Eagle Ford and an option to purchase a 20% share of acreage acquired by us after the closing located in specified areas adjacent to the initially purchased areas. We generally serve as operator of the GAIL joint venture properties.
Delaware Basin
During 2014, we began to build an acreage position in the Delaware Basin in Culberson and Reeves counties, Texas, targeting the Wolfcamp Formation. In the third quarter of 2017, we closed on an acquisition of 16,508 net acres located in Reeves and Ward Counties, Texas from ExL Petroleum Management, LLC and ExL Petroleum Operating Inc. (the “ExL Acquisition”). In the fourth quarter of 2018, we closed on the Devon Acquisition which added approximately 10,000 net acres. As of December 31, 2015,2018, we held interests in approximately 41,17870,335 gross (21,915(46,004 net) acres in the Delaware Basin. We drilled our first operated wellProduction in the Delaware Basin for the year ended December 31, 2018 increased 237% from the same period in 2017. Excluding production associated with the Devon


Acquisition, production in the second quarter of 2015, and drilled a total of 4 gross (3.6 net) wells duringDelaware Basin for the year and completed 2 gross (1.7 net) wells. We finished drilling our fifth operated wellended December 31, 2018 increased 231% as compared to the same period in early 2016. We continue to like the potential2017. In 2018, we spent approximately $321.2 million in the play and lookDelaware Basin, which was approximately 4% below our 2018 DC&I capital expenditure plan for the Delaware Basin, due to expandthe capital shift discussed above. We currently plan for approximately 41% of our acreage over time.

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Niobrara
As of December 31, 2015, we held interests in approximately 105,825 gross (33,582 net) acres 2019 DC&I capital expenditure plan to be directed towards opportunities in the Niobrara, primarily in Weld and Adams counties, Colorado, and were not operating any rigs. During 2015, we drilled 13 gross (7.5 net) wells as operator and participated in 42 gross (3.6 net) additional wells as a non-operator. We currently expect to continue to participate as a non-operator in high-density projects in the Niobrara, but have no current plans to drill any operated wells in Niobrara in 2016. We have limited amounts allocated to Niobrara as part of our 2016 drilling and completion capital expenditure plan.Delaware Basin.
OIL JV Partners Joint Venture. In October 2012, we completed the sale of a portion of our interests in certain oil and gas properties in the Niobrara to OIL India (USA) Inc. and IOCL (USA) Inc., wholly owned subsidiaries of OIL India Ltd. and Indian Oil Corporation Ltd., respectively. For convenience, in this Annual Report on Form 10-K the term “OIL JV Partners” is used to refer collectively to OIL India (USA) Inc. and IOCL (USA) Inc. We also granted an option in favor of the OIL JV Partners to purchase a 30% share of acreage subsequently acquired by us in specified areas of the play.
Haimo Joint Venture. In December 2012, we completed the sale of an additional portion of our remaining interests in the same oil and gas properties sold to the OIL JV Partners in the transaction described above to Haimo Oil & Gas LLC (“Haimo”), a wholly owned subsidiary of Lanzhou Haimo Technologies Co. Ltd. We also granted an option in favor of Haimo to purchase a 10% share of acreage subsequently acquired by us in the same properties as the OIL JV Partners described above. Following the closing of the Haimo transaction in fourth quarter 2012, the joint venture ownership interests in our Niobrara development activities were 60% Carrizo, 30% the OIL JV Partners, and 10% Haimo.
We serve as operator of a significant percentage of the properties covered by our Niobrara joint venture arrangements.
Utica
As of December 31, 2015, we held interests in approximately 37,582 gross (27,305 net) acres in the Utica. During 2015, we did not drill any operated wells, but brought online 2 gross (1.7 net) wells. We also have 16 additional wells in inventory where we have drilled and cased the upper portions of such wells. We do not expect to complete the drilling of these wells until oil prices recover or we obtain additional funding. During 2015, we participated in the drilling and completion of 2 gross (0.5 net) additional wells as a non-operator. As of December 31, 2015, we were not operating any rigs in the Utica and have limited amounts of our 2016 drilling and completion expenditure plan allocated to this play.
Avista Utica Joint Venture. Effective September 2011, our wholly-owned subsidiary, Carrizo (Utica) LLC, entered into a joint venture in the Utica with ACP II Marcellus LLC (“ACP II”), which is also one of our joint venture partners in the Marcellus, and ACP III Utica LLC (“ACP III”), both affiliates of Avista Capital Partners, LP, a private equity fund (collectively with ACP II and ACP III, “Avista”). During the term of the Avista Utica joint venture, the joint venture partners acquired and sold acreage and we exercised options under the Avista Utica joint venture agreements to acquire acreage from Avista. The Avista Utica joint venture agreements were terminated on October 31, 2013 in connection with our purchase of certain ACP III assets. After giving effect to this transaction, we and Avista remain working interest partners and we will operate the jointly owned properties which are now subject to standard joint operating agreements. The joint operating agreements with Avista provide for limited areas of mutual interest around our remaining jointly owned acreage.
Steven A. Webster, Chairman of our Board of Directors, serves as Co-Managing Partner and President of Avista Capital Holdings, LP, which has the ability to control Avista and its affiliates. ACP II’s and ACP III’s Boards of Managers have the sole authority for determining whether, when and to what extent any cash distributions will be declared and paid to members of ACP II or ACP III, respectively. Mr. Webster is not a member of either entity’s Board of Managers. As previously disclosed, we have been a party to prior arrangements with affiliates of Avista Capital Holdings LP, including our existing joint venture with Avista in the Marcellus. The terms of the joint ventures with Avista in the Utica and the Marcellus and the related transactions that took place were each separately approved by a special committee of the Company’s independent directors. See also “Note 12. Related Party Transactions” of the Notes to our Consolidated Financial Statements.
Marcellus
We began active participation in the Marcellus in 2007. We leveraged the knowledge and experience that we gained in the Barnett Shale to effectively explore for and develop natural gas in the Marcellus. Our activities in the Marcellus are currently conducted through two joint ventures described below.
As of December 31, 2015, we held interests in approximately 59,979 gross (19,271 net) acres in the Marcellus. We will continue to monitor prices and, consistent with our existing contractual commitments, may increase our activity level and capital expenditures, if natural gas prices so warrant. As of December 31, 2015, we were not operating any rigs in the Marcellus.

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Reliance Joint Venture. In September 2010, we completed the sale of 20% of our interests in substantially all of our oil and gas properties in Pennsylvania that had been subject to the Avista Marcellus joint venture described in “Avista Marcellus Joint Venture” below to Reliance Marcellus II, LLC (“Reliance”), a wholly owned subsidiary of Reliance Holding USA, Inc. and an affiliate of Reliance Industries Limited. As described in “Avista Marcellus Joint Venture” below, simultaneously with the closing of our transaction with Reliance, ACP II closed the sale of its entire interest in the same properties to Reliance. In connection with these sale transactions, we and Reliance also entered into agreements to form a new joint venture with respect to the interests purchased by Reliance from us and Avista. The joint venture properties are generally held 60% by Reliance and 40% by us.
We have agreed to various restrictions on our ability to transfer our properties covered by the Reliance joint venture. Additionally, we are subject to a mutual right of first offer on direct and indirect property transfers for the remainder of a ten-year development period (through September 2020), subject to specified exceptions. We generally serve as operator of the properties covered by the Reliance joint venture, with Reliance having the right to assume operatorship of 60% of undeveloped acreage in portions of central Pennsylvania.
Avista Marcellus Joint Venture. Effective August 2008, our wholly owned subsidiary Carrizo (Marcellus) LLC entered into a joint venture arrangement with ACP II, an affiliate of Avista. In September 2010, we completed the sale of 20% of our interests in substantially all of our oil and gas properties in Pennsylvania that had been subject to the Avista joint venture to Reliance as described above under “Reliance Joint Venture.” Simultaneously with the closing of this transaction, ACP II closed the sale of its entire interest in the same properties to Reliance. In connection with these sales transactions, we and Avista amended the participation agreement and other joint venture agreements with Avista to provide that the properties that we and Avista sold to Reliance, as well as the properties we committed to the new joint venture with Reliance, were no longer subject to the terms of the Avista Marcellus joint venture, and that the Avista Marcellus joint venture’s area of mutual interest would generally not include Pennsylvania, the state in which those properties were located. Our joint venture with Avista continues and covers acreage primarily in West Virginia and New York. Pursuant to the terms of the amended participation agreement, the areas of mutual interest with Avista have been reduced to specified halos around existing properties in New York and West Virginia. We conducted no material activity under this joint venture during 2015 and do not currently expect to conduct any activity in 2016. For further discussion, see “Note 12. Related Party Transactions” of the Notes to our Consolidated Financial Statements.
Additional Oil and Gas Disclosures
Proved Oil and Gas Reserves
The following table sets forth summary information with respect to our estimated net proved oil and gas reserves and PV-10 for the PV-10 value of such reserves as of years ended December 31, 2015. The reserve data2018, 2017 and the present value as of December 31, 20152016 that were prepared by Ryder Scott Company, L.P. (“Ryder Scott”), our independent third party reserve engineers. For further information concerning Ryder Scott'sScott’s estimates of our proved reserves at as of December 31, 2015,2018, see the reserve report included as an exhibit to this Annual Report on Form 10-K.
The prices used in the calculation of our estimated proved reserves and PV-10 value was prepared using an unweighted arithmeticwere based on the average realized prices for sales of crude oil, NGLs and natural gas on the first calendar day of the month oil and gas prices for each month during the year (“12-Month Average Realized Price”) in accordance with SEC rules. The following prices were used in the prior twelve-month period ended December 31, 2015, discounted at 10% per annum on a pre-tax basis, and is not intended to representcalculation of estimated proved reserves for the current market value of the estimated oil and gas reserves owned by us. respective years.
  Years Ended December 31,
  2018 2017 2016
Crude oil ($ per Bbl) 
$63.80
 
$49.87
 
$39.60
NGLs ($ per Bbl) 
$26.15
 
$19.78
 
$11.66
Natural Gas ($ per Mcf) 
$2.46
 
$2.96
 
$1.89
For further information concerning the present value of estimated future net revenues from these proved reserves, see “Note 2. Summary of Significant Accounting Policies” and “Note 18.17. Supplemental Disclosures Aboutabout Oil and Gas Producing Activities (Unaudited)” of the Notes to our Consolidated Financial Statements.
Summary of Proved Oil and Gas Reserves as of December 31, 2015
Based on Average 2015 Prices
(Dollars in millions)
  Crude Oil and Condensate (MBbls) Natural Gas
Liquids (MBbls)
 
Natural Gas
(MMcf)
 
Total Oil-Equivalent
(MBoe) (1)
 
PV-10
Value (2)
Developed 42,311
 7,933
 154,725
 76,032
 
$857.1
Undeveloped 67,277
 12,288
 90,213
 94,600
 
$508.1
Total Proved 109,588
 20,221
 244,938
 170,632
 
$1,365.2

(1)Barrel of oil equivalents are determined using the ratio of six Mcf of natural gas to one Bbl of crude oil or one Bbl of natural gas liquids which represents their approximate energy content. Despite holding this ratio constant at six Mcf to one Bbl, current prices are substantially higher for oil than natural gas on an energy equivalent basis, although there have been periods in which they have been lower or substantially lower.
(2)
The PV-10 value as of December 31, 2015 is pre-tax and was determined by using the average of oil and gas prices at the beginning of each month in the twelve-month period prior to December 31, 2015, net of commodity price differentials, which averaged $47.24 per Bbl of oil, $12.00 per Bbl of natural gas liquids, and $1.87 per Mcf of natural gas. As a result of significant decreases in commodity prices,

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the average prices used to calculate PV-10 value as of December 31, 2015 are significantly higher than recent prices. See also “—Other Reserve Matters” below for further discussion.


The following table summarizes our estimated proved reserves, standardized measure of discounted future net cash flows and PV-10 for the years ended December 31, 2018, 2017 and 2016.
  As of December 31,
  2018 2017 2016
Proved developed reserves      
Crude oil (MBbls) 75,267
 69,632
 51,062
NGLs (MBbls) 25,809
 17,447
 9,387
Natural Gas (MMcf) 178,941
 131,355
 187,054
Total proved developed reserves (MBoe) 130,899
 108,972
 91,625
       
Proved undeveloped reserves     
Crude oil (MBbls) 104,469
 97,742
 77,256
NGLs (MBbls) 43,314
 25,151
 14,550
Natural Gas (MMcf) 304,120
 179,115
 100,391
Total proved undeveloped reserves (MBoe) 198,470
 152,745
 108,538
       
Total proved reserves      
Crude oil (MBbls) 179,736
 167,374
 128,318
NGLs (MBbls) 69,123
 42,598
 23,937
Natural Gas (MMcf) 483,061
 310,470
 287,445
Total proved reserves (MBoe) 329,369
 261,717
 200,163
Proved developed reserves % 40% 42% 46%
Proved undeveloped reserves % 60% 58% 54%
       
Reserve data (In millions):      
Standardized measure of discounted future net cash flows (GAAP) 
$3,635.6
 
$2,465.1
 
$1,303.4
PV-10 (Non-GAAP):      
Proved developed PV-10 
$2,383.9
 
$1,621.0
 
$854.3
Proved undeveloped PV-10 1,707.5
 1,017.4
 449.1
Total PV-10 (Non-GAAP) 
$4,091.4
 
$2,638.4
 
$1,303.4
Reconciliation of Standardized Measure of Discounted Future Net Cash Flows (GAAP) to PV-10 (Non-GAAP)
We believe that the presentation of a pre-tax PV-10 value provides relevantgreater comparability when evaluating oil and useful information because itgas companies due to the many factors unique to each individual company that impact the amount and timing of future income taxes. In addition, we believe that PV-10 is widely used by investors and analysts as a basis for comparing the relative size and value of our proved reserves to other oil and gas companies. Because many factors that are unique to each individual company may impactPV-10 should not be considered in isolation or as a substitute for the amount and timingstandardized measure of discounted future income taxes, the usenet cash flows or any other measure of a pre-tax PV-10 value provides greater comparability when evaluating oil and gas companies. The PV-10 value is not a measure ofcompany’s financial or operating performance under U.S. GAAP, nor is it intended to represent the current market value of proved oil and gas reserves.presented in accordance with GAAP. The definition of PV-10 value as defined in “Item 1. Business—Glossary of Certain Industry Terms” may differ significantly from the definitions used by other companies to compute similar measures. As a result, the PV-10 value as defined may not be comparable to similar measures provided by other companies. The most comparable U.S. GAAP financial measure,A reconciliation of the standardized measure of discounted future net cash flows and information reconcilingto PV-10 is presented below. Neither PV-10 nor the U.S. GAAP and non-U.S. GAAP measures are included in the table below. Both the PV-10 and standardized measure of discounted future net cash flows do not purport to presentrepresent the fair value of our proved oil and gas reserves.

Reconciliation of Standardized Measure of Discounted Future Net Cash Flows (U.S. GAAP)
to PV-10 Value (Non-U.S. GAAP)
As of December 31, 2015 (In millions)
Standardized measure of discounted future net cash flows (U.S. GAAP)
$1,365.2
Add: present value of future income taxes discounted at 10% per annum
PV-10 value (Non-U.S. GAAP) (1)
$1,365.2
  As of December 31,
  2018 2017 2016
  (In millions)
Standardized measure of discounted future net cash flows (GAAP) 
$3,635.6
 
$2,465.1
 
$1,303.4
Add: present value of future income taxes discounted at 10% per annum 455.8
 173.3
 
PV-10 (Non-GAAP) 
$4,091.4
 
$2,638.4
 
$1,303.4


Proved Reserves
The following table provides a summary of the changes in our proved reserves for the year ended December 31, 2018.
  Crude Oil (MBbls) NGLs (MBbls) Natural Gas (MMcf) 
Total
(MBoe)
Proved reserves as of December 31, 2017 167,374
 42,598
 310,470
 261,717
Extensions and discoveries 65,352
 30,195
 212,758
 131,007
Revisions of previous estimates (31,287) 1,936
 (6,006) (30,352)
Purchases of reserves in place 2,205
 967
 7,953
 4,498
Sales of reserves in place (9,676) (2,872) (17,475) (15,461)
Production (14,232) (3,701) (24,639) (22,040)
Proved reserves as of December 31, 2018 179,736
 69,123
 483,061
 329,369
(1)Additional presentations of PV-10 in this document similarly include amounts for present value of future income taxes, and therefore no additional reconciliation is provided.
Extensions and discoveries of 131,007 MBoe were comprised of 12,687 MBoe of proved developed reserves and 118,320 MBoe of proved undeveloped reserves (“PUDs”) that were added through our drilling program and associated offset locations. Eagle Ford and Delaware Basin comprised 30% and 70%, respectively, of the total extensions and discoveries.
Revisions of previous estimates reduced our reserves by 30,352 MBoe. Included in the revisions of previous estimates were the following components;
Negative revisions of 21,753 MBoe, primarily in the Eagle Ford, due to changes in our previously approved development plan, which resulted in the timing of development for certain PUD locations to move beyond five years from initial booking. The primary drivers of the changes in our previously approved development plan are the reallocation of capital to areas providing the greatest opportunities to increase capital efficiency and maximize project-level economics within our reduced capital expenditure plan, which includes a shift to larger-scale development projects.
Net negative revisions of 12,363 MBoe, primarily due to negative revisions of 14,907 MBoe in the Eagle Ford, partially offset by positive revisions of 2,544 MBoe in the Delaware Basin. The negative revisions in the Eagle Ford were primarily a result of completion of new wells that negatively impacted the production of adjacent existing producing wells and the associated impact to certain PUD locations, as well as a reduction in spacing and the average lateral length for certain PUD locations.
Positive revisions due to price of 3,764 MBoe.
Purchases of reserves in place included 4,498 MBoe of proved developed reserves associated with the Devon Acquisition.
Sales of reserves in place included 13,465 MBoe of proved developed reserves and 1,996 MBoe of proved undeveloped reserves associated with the Eagle Ford and Niobrara Formation divestitures.
Proved Undeveloped Reserves
The following table provides a reconciliationsummary of the changes in our proved undeveloped reserves (“PUDs”)PUDs for the year ended December 31, 2015.2018.
 Crude Oil and Condensate (MBbls) Natural Gas Liquids (MBbls) Natural Gas (MMcf) Total Oil-Equivalent (MBoe) Crude Oil (MBbls) NGLs (MBbls) Natural Gas (MMcf) 
Total
(MBoe)
PUDs as of December 31, 2014 65,466
 8,218
 71,320
 85,571
PUDs as of December 31, 2017 97,742
 25,151
 179,115
 152,745
Extensions and discoveries 23,287
 4,365
 26,493
 32,067
 58,373
 27,581
 194,196
 118,320
Removed due to changes in development plan (15,847) (2,686) (16,219) (21,236)
Revisions of previous estimates (9,040) 2,274
 8,980
 (5,268)
Sales of reserves in place (1,403) (289) (1,823) (1,996)
Converted to proved developed reserves (16,443) (2,135) (13,631) (20,850) (25,356) (8,717) (60,129) (44,095)
Revisions of previous estimates (5,033) 1,840
 6,031
 (2,188)
PUDs as of December 31, 2015 67,277
 12,288
 90,213
 94,600
PUDs as of December 31, 2018 104,469
 43,314
 304,120
 198,470
In 2015, we added 82 gross (71.3 net) PUDExtensions and discoveries of 118,320 MBoe were due to additional offset locations or 32.1 MMBoe,associated with our drilling program, of which approximately 73%84,399 MBoe were crude oil, with approximately 99% ofin the additions as a result of drillingDelaware Basin and additional offset locations33,921 MBoe were in the Eagle Ford.
During 2015, we converted 61 gross (55.2 net) We incurred $36.6 million during 2018 for certain of these PUD locations or 20.9 MMBoethat were drilled but uncompleted as of reserves from proved undeveloped to proved developed,December 31, 2018, with $18.7 million incurred in the Eagle Ford and $17.9 million in the Delaware Basin.
We removed 21,236 MBoe of PUDs, primarily in the Eagle Ford, due to changes in our previously approved development plan, which resulted in the timing of development for certain PUD locations to move beyond five years from initial booking. The primary drivers of the changes in our previously approved development plan are the reallocation of capital to areas providing the greatest opportunities to increase capital efficiency and maximize project-level economics within our reduced capital expenditure plan, which includes a shift to larger-scale development projects.


Revisions of previous estimates of 5,268 MBoe included 5,917 MBoe of negative revisions, partially offset by 649 MBoe of positive revisions due to pricing. The negative revisions, of which 4,792 MBoe were in the Eagle Ford, were primarily a result of incorporating the impact to estimated future production for certain PUD locations where future completions are adjacent to the respective PUD location, as well as a reduction in spacing and the average lateral length for certain PUD locations.
Sales of PUDs in place of 1,996 MBoe were related to the sale of a portion of our assets in the Eagle Ford in the first quarter of 2018. We had no PUDs associated with the divestiture in the Niobrara Formation.
We converted 44,095 MBoe of PUDs that were booked as PUDs as of December 31, 2017 to proved developed during 2018, of which 23,181 MBoe were in the Eagle Ford and 20,914 MBoe were in the Delaware Basin, at a total cost of approximately $288.1$490.5 million, or $13.78$11.12 per Boe.
We spent $39.0converted an additional 10,430 MBoe of PUDs that were booked as PUDs during 2018 to proved developed, and therefore not included in the table above, of which 5,161 MBoe were in the Eagle Ford and 5,269 MBoe in the Delaware Basin. The total cost to convert these PUDs was $126.6 million, or $12.14 per Boe, of which $79.2 million, or $15.35 per Boe, was in the Eagle Ford and $47.4 million, or $9.00 per Boe, was in the Delaware Basin.
During 2018, we also incurred $68.0 million on PUDs that existedwere drilled but uncompleted as of December 31, 2018 that were booked as PUDs as of December 31, 2017, of which $42.7 million was in 2014the Eagle Ford and $25.3 million was in the Delaware Basin. As of December 31, 2018, we had 25,616 MBoe of PUDs associated with wells that were drilled but uncompleted, 14,430 MBoe of which were in 2015the Eagle Ford and waiting on completion. We also spent $19.2 million on locations that were added11,186 MBoe in 2015 and were drilled and waiting on completion.
Included in revisions during 2015, were negative price revisions of 7.5 MMBoe primarily as a resultthe Delaware Basin. All of the average oil price, as described above,reserves associated with drilled but uncompleted wells are scheduled to be completed in 2019. We expect to incur $212.6 million of $47.24 in our 2015 reserves as comparedcapital expenditures to $92.24 in our 2014 reserves. Included incomplete these wells, with $154.4 million allocated to the negative price revisions were 42 gross (20.9 net) PUD locations, or 5.3 MMBoe, primarily in Niobrara, that were removed as a result ofEagle Ford and $58.2 million allocated to the lower prices. The negative price revision of 7.5 MMBoe was partially offset by positive performance revisions of 5.3 MMBoe as we realized better processing yields for NGLs and natural gas during the year.Delaware Basin.
At December 31, 2015,2018, we did not have any reserves that have remained undeveloped for five or more years since the date of their initial booking and all PUD drilling locations are scheduled to be converteddeveloped within five years of their initial booking.
Qualifications of Technical Persons
In accordance with the Standards Pertaining to the Estimating and Auditing of Oil and Gas Reserves Information promulgated by the Society of Petroleum Engineers and the guidelines established by the Securities and Exchange Commission (“SEC”), Ryder Scott estimated 100% of our proved reserves as of December 31, 2015, 2014,2018, 2017, and 20132016 as presented in this Annual Report on Form 10-K. The technical persons responsible for preparing the reserves estimates meet the requirements regarding qualifications,

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independence, objectivity and confidentiality set forth in the Standards Pertaining to Estimating and Auditing of Oil and Gas Reserves Information promulgated by the Society of Petroleum Engineers. Further, Ryder Scott does not own an interest in our properties and is not employed on a contingent fee basis.
Our internal reserve engineers each have over 25 years of experience in the petroleum industry and extensive experience in the estimation of reserves and the review of reserve reports prepared by third party engineering firms. The reserve reports are also reviewed by senior management, including the Chief Executive Officer, who is a registered petroleum engineer and holds a B.S. in Mechanical Engineering and the Chief Operating Officer, who holds a B.S. in Petroleum Engineering.
Internal Controls Over Reserve Estimation Process
The primary inputs to the reserve estimation process are comprised of technical information, financial data, production data, and ownership interests. All field and reservoir technical information, which is updated annually, is assessed for validity when the internal reserve engineers hold technical meetings with our geoscientists, operations, and land personnel to discuss field performance and to validate future development plans. The other inputs used in the reserve estimation process, including, but not limited to, future capital expenditures, commodity price differentials, production costs, and ownership percentages are subject to internal controls over financial reporting and are assessed for effectiveness annually.
Our internal reserve engineers work closely with Ryder Scott to ensure the integrity, accuracy, and timeliness of the data furnished to Ryder Scott for use in their reserves estimation process. Our internal reserve engineers meet regularly with Ryder Scott to review and discuss methods and assumptions used in Ryder Scott'sScott’s preparation of the year-end reserves estimates. The internal reserve engineers review the inputs and assumptions made in the reserves estimates prepared by Ryder Scott and assess them for reasonableness.
Specific internal control procedures include, but are not limited to, the following:
Review by our internal reserve engineers of all of our reported proved reserves at the close of each quarter, including review of all newadditions to PUD additionsreserves
Quarterly updates by our senior management to our Board of Directors regarding operational data, including production, drilling and completion activity and any significant changes in our reserves estimates
Quarterly and annual preparation of a reserve reconciliation that is reviewed by members of our senior management


Annual review by our senior management of our year-end reserves estimates prepared by Ryder Scott
Annual review by our senior management and Board of Directors of our multi-year development plan and approval by the Board of Directors of our capital expenditure plan
Review by our senior management of changes, if applicable, in our previously approved development plan
Other Reserve Matters
No estimates of proved reserves comparable to those included herein have been included in reports to any federal agency other than the SEC. The reserves data set forth in this Annual Report on Form 10-K represents only estimates. See “Item 1A. Risk Factors—Our reserve data and estimated discounted future net cash flows are estimates based on assumptions that may be inaccurate and are based on existing economic and operating conditions that may change in the future.”
Our future oil and gas production is highly dependent upon our level of success in finding or acquiring additional reserves. See “Item 1A. Risk Factors—We depend on successful exploration, development and acquisitions to maintain reserves and revenue in the future.” Also, the failure of an operator of our wells to adequately perform operations, or such operator’s breach of the applicable agreements, could adversely impact us. See “Item 1A. Risk Factors—We cannot control the activities on properties we do not operate.”
In accordance with SEC regulations, Ryder Scott and our internal reserve engineers each used the price based on the unweighted average of benchmark oil and gas prices at the beginning of each month in the twelve-month period ended December 31, 2015, adjusted for commodity price differentials. The prices used in calculating the estimated future net revenue attributable to proved reserves do not necessarily reflect market prices for oil and gas production subsequent to December 31, 2015. As a result of significant decreases in commodity prices, the average prices used to calculate PV-10 value as of December 31, 2015 are significantly higher than recent prices. If commodity prices remain at low levels or decline, we will likely experience a reduction in PV-10 value. Using the assumptions included in our 2015 proved oil and gas reserves, substituting the spot price of oil on December 31, 2015 of $37.13 per Bbl for the SEC benchmark NYMEX oil price, our PV-10 value would have been approximately $609.0 million, or $756.2 million less than our actual PV-10 value of $1,365.2 million as of December 31, 2015.production. See “Item 1A. Risk Factors—Our reserve data and estimated discounted future net cash flows are estimates based on assumptions that may be inaccurate and are based on existing economic and operating conditions that may change in the future.” There can be no assurance that all of the proved reserves will be produced and sold within the periods indicated, that the assumed prices will actually be realized for such production or that existing contracts will be honored or judicially enforced.

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Oil and Gas Production, Prices and Costs
The following table sets forth certain information regarding the production volumes, average realized prices and average production costs associated with our sales of crude oil and natural gas for the periods indicated.
 Year Ended December 31, Years Ended December 31,
 2015 2014 2013 2018 2017 2016
Total production volumes -   
  
Total production volumes   
  
Crude oil (MBbls) 8,415
 6,906
 4,231
 14,232
 12,566
 9,423
NGLs (MBbls) 1,352
 926
 531
 3,701
 2,327
 1,788
Natural gas (MMcf) 21,812
 24,877
 31,422
 24,639
 28,472
 25,574
Total barrels of oil equivalent (MBoe) 13,402
 11,978
 9,999
 22,040
 19,639
 15,473
            
Daily production volumes by product -      
Daily production volumes by product      
Crude oil (Bbls/d) 23,054
 18,921
 11,592
 38,992
 34,428
 25,745
NGLs (Bbls/d) 3,705
 2,537
 1,455
 10,139
 6,376
 4,885
Natural gas (Mcf/d) 59,758
 68,156
 86,088
 67,503
 78,006
 69,873
Total barrels of oil equivalent per day (Boe/d) 36,719
 32,816
 27,395
 60,382
 53,805
 42,276
            
Daily production volumes by region (Boe/d) -      
Daily production volumes by region (Boe/d)      
Eagle Ford 26,377
 21,131
 12,628
 37,591
 37,825
 30,664
Niobrara 2,957
 2,585
 1,724
Marcellus 5,850
 8,354
 6,139
Utica 1,286
 288
 10
Delaware Basin and other 249
 458
 269
Barnett 
 
 6,625
Delaware Basin 22,609
 6,713
 1,115
Other 182
 9,267
 10,497
Total barrels of oil equivalent (Boe/d) 36,719
 32,816
 27,395
 60,382
 53,805
 42,276
            
Average realized prices -   
  
Average realized prices   
  
Crude oil ($ per Bbl) 
$44.69
 
$88.40
 
$99.58
 
$64.05
 
$50.39
 
$40.12
NGLs ($ per Bbl) 
$11.54
 
$27.05
 
$29.25
 26.10
 20.37
 12.54
Natural gas ($ per Mcf) 
$1.72
 
$3.00
 
$2.65
 2.35
 2.29
 1.69
Total average realized price ($ per Boe) 
$32.03
 
$59.29
 
$52.02
 
$48.36
 
$37.98
 
$28.67
            
Average production costs ($ per Boe) (1) 
$6.72
 
$6.19
 
$4.68
Average production costs ($ per Boe)      
Lease operating expense 
$7.33
 
$7.12
 
$6.38
Production taxes 
$2.30
 
$1.66
 
$1.23
Ad valorem taxes 
$0.47
 
$0.37
 
$0.36
Total average production costs ($ per Boe) 
$10.10
 
$9.15
 
$7.97
(1)Includes lease operating costs but excludes production tax and ad valorem tax.
Drilling Activity
The following table sets forth our operated and non-operated drilling activity for the years ended December 31, 2015, 20142018, 2017 and 20132016 by geographical area.. In the table, “gross” refers to the total wells in which we have a working interest and “net” refers to gross wells multiplied by our working interest therein. As defined by the SEC, the number of wells drilled refers to the number of wells completed at any time during the respective year, regardless of when drilling was initiated. For definitions of exploratory wells, development wells, productive wells, and non-productive wells, see “—Glossary of Certain Industry Terms”. 
 Year Ended December 31, Years Ended December 31,
 2015 2014 2013 2018 2017 2016
 Gross Net Gross Net Gross Net Gross Net Gross Net Gross Net
Exploratory Wells - Productive 77
 19.5
 128
 23.0
 75
 13.9
 38
 2.5
 47
(1) 
7.1
(1) 
29
 4.5
Exploratory Wells - Nonproductive 
 
 
 
 2
 2.0
Exploratory Wells - Non-productive 
 
 
 
 
 
Development Wells - Productive 65
 55.4
 77
 63.5
 119
 64.6
 117
 101.8
 102
(2) 
89.7
(2) 
81
 73.5
Development Wells - Nonproductive 
 
 
 
 
 
Development Wells - Non-productive 
 
 
 
 
 
The wells are in various stages of development or stages of production.
(1)Includes 37 gross (6.3 net) productive exploratory wells which were part of the divestitures of substantially all of our assets in the Utica, Marcellus, and Niobrara, as well as a portion of our assets in the Eagle Ford.
(2)Includes 5 gross (3.8 net) productive development wells which were part of the divestiture of a portion of our assets in the Eagle Ford.


As of December 31, 20152018, we were in the process of drillinghad 680 gross (6.063.7 net) operated and non-operated wells in various stages of drilling, completion or waiting on completion that are not included in the table above.

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Productive Wells
The following table sets forth the number of productive crude oil and natural gas wells in which we owned an interest as of December 31, 20152018. 
  
Company
Operated
 Non-Operated Total
  Gross Net Gross Net Gross Net
Crude oil 383
 281.8
 213
 17.2
 596
 299.0
Natural gas 91
 33.5
 22
 0.6
 113
 34.1
Total 474
 315.3
 235
 17.8
 709
 333.1
  Crude Oil Natural Gas Total
  Gross Net Gross Net Gross Net
Eagle Ford - Operated 532
 477.6
 2
 1.8
 534
 479.4
Eagle Ford - Non-operated 12
 2.0
 
 
 12
 2.0
Total Eagle Ford 544
 479.6
 2
 1.8
 546
 481.4
             
Delaware Basin - Operated 54
 44.8
 30
 28.6
 84
 73.4
Delaware Basin - Non-operated 14
 1.9
 43
 2.1
 57
 4.0
Total Delaware Basin 68
 46.7
 73
 30.7
 141
 77.4
             
Other (1)
 
 
 14
 0.6
 14
 0.6
Total 612
 526.3
 89
 33.1
 701
 559.4
(1)All wells included in Other were non-operated wells.
Acreage Data
The following table sets forth certain information regarding our developed and undeveloped lease acreage as of December 31, 20152018. Developed acreage refers to acreage on which wells have been drilled or completed to a point that would permit production of oil and gas in commercial quantities. Undeveloped acreage refers to acreage on which wells have not been drilled or completed to a point that would permit production of oil and gas in commercial quantities whether or not the acreage contains proved reserves. 
  
Developed
 Acreage
 Undeveloped Acreage Total Acreage Percent of Net Undeveloped Acreage Expiring
  Gross Net Gross Net Gross Net 2016 2017 2018
Eagle Ford 65,442
 54,495
 41,579
 28,175
 107,021
 82,670
 21% 26% 7%
Niobrara 41,481
 15,241
 64,344
 18,341
 105,825
 33,582
 9% 3% 8%
Utica 1,949
 1,577
 35,633
 25,728
 37,582
 27,305
 8% 31% 11%
Delaware Basin 3,527
 1,797
 37,651
 20,118
 41,178
 21,915
 20% 57% 2%
Marcellus 14,358
 5,248
 45,621
 14,023
 59,979
 19,271
 9% 20% 44%
Other (1) 4,705
 3,181
 186,333
 125,067
 191,038
 128,248
 57% 14% 14%
Total 131,462
 81,539
 411,161
 231,452
 542,623
 312,991
 37% 21% 13%
  
Developed
 Acreage
 Undeveloped Acreage Total Acreage Net Undeveloped Acreage Expiring 
  Gross Net Gross Net Gross Net 2019 2020 2021 
Eagle Ford 76,644
 63,970
 15,126
 12,492
 91,770
 76,462
 3,228
(1) 
1,499
(1) 

 
Delaware Basin 39,533
 28,076
 30,802
 17,928
 70,335
 46,004
 1,760
(2) 
11,563
(2) 
348
(2) 
Other 2,467
 404
 72,847
 42,900
 75,314
 43,304
 2,920
(3) 

 1,234
(3) 
Total 118,644
 92,450
 118,775
 73,320
 237,419
 165,770
 7,908
 13,062
 1,582
 
 
(1)Approximately 100% and 68% of the acreage expiring in 2019 and 2020, respectively, will be developed prior to expiration or extended by lease extension payments. We have no current development plans and no proved undeveloped reserves associated with the remaining acreage as of December 31, 2018.
(2)Approximately 73%, 6% and 90% of the acreage expiring in 2019, 2020 and 2021, respectively, will be developed prior to expiration or extended by lease extension payments. The acreage expiring in 2020 is primarily in our Alpine High area where, along with the other remaining acreage, we have no current development plans and no proved undeveloped reserves.
(3)Other includes non-core acreage principally located in Texas, Colorado, Wyoming, West Virginia, Kentucky, IllinoisOhio, and New York, where the Company does not currently intend toIllinois. We have any capital expenditures.no current development plans or proved undeveloped reserves associated with this acreage as of December 31, 2018.
Our lease agreements generally terminate if producing wells have not been drilled on the acreage within their primary term or an extension thereof (a period that can be from three to tenfive years depending on the area). In the ordinary course of business, based on the results of our exploration efforts, we have allowed certain acreage to expire and may allow additional acreage to expire in the future. See table above for theThe percentage of net undeveloped acreage expiring in 2016, 2017,2019, 2020, and 2018, assuming2021 assumes that no producing wells have been drilled on acreage within their primary term or have been extended. We manage our lease expirations to ensure that we do not experience unintended material expirations. Our leasehold management efforts include scheduling drilling in order to hold leases by production is established onor timely exercising our contractual rights to extend the terms of leases withinby continuous operations or the primary term. payment of lease extension payments and delay rentals. We may choose to allow some leases to expire that are no longer part of our development plans.
The proved undeveloped reserves associated with the acreage expiring over the next three years are not material to the Company.


Marketing
Our production is marketed to third parties consistent with industry practices. Typically, our oil and gasproduction is sold at the wellhead to unaffiliated third parties. Oilparty purchasers. Crude oil is sold at field-posted prices plus or minus a bonus or at a price based on posted prices or NYMEX plus or minus a differentialmarket differentials for the respective area. Natural gas isand NGLs are sold under contract at a negotiated price which is based on the market price for the area or at published prices for specified locations or pipelines (such as Houston Ship Channel, Dominion Transmission, Texas Eastern Zone M-3, Tennessee Gas Pipeline Zone 4-300, and Transco Leidy Hub) and then discounted by the purchaser back to the wellhead based upon a number of factors normally considered in the industry (such as distance from the well to the central sales point,market location, well pressure, quality of natural gas and prevailing supply and demand conditions). We have made the strategic decisionNatural gas is generally delivered to sell as much of our natural gas productiona midstream processing entity at the wellhead as possible, so that we can concentrate our effortsor the inlet of the midstream processing entity’s system. The midstream processing entity gathers and resources on exploration and production which we believe are more consistent with our competitive expertise, rather than inprocesses the natural gas pipeline operation, natural gas marketing and sales. In each case, weremits proceeds for the resulting sales of NGLs and residue gas. We sell at competitive market prices based on a differential to several sales points.market locations. In instances of depressed oil and gas prices, we may elect to shut-in wells until commodity prices are more favorable. We do not believe the loss of any one of our purchasers would materially affect our ability to sell the oil and gas we produce because we believe other purchasers are available in all our areas of operations.
Our marketing objective is to receive competitive wellhead prices for our product. There are a variety of factors that affect the market for oil and gas generally, including:
demand for oil and gas;

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the extent of supply of oil and gas and, in particular, domestic production and imports;
the proximity and capacity of natural gas pipelines and other transportation facilities;
the marketing of competitive fuels; and
the effects of state and federal regulations on oil and gas production and sales.
See “Item 1A. Risk Factors—Oil and gas prices are highly volatile, and continued low oil and gas prices or further price decreases will negatively affect our financial position, planned capital expenditures and results of operations,” “—We are subject to various environmental risks and governmental regulations, including those relating to benzene emissions, hydraulic fracturing and global climate change, and future regulations may be more stringent resulting in increased operating costs and decreased demand for the oil and gas that we produce,” and “—If our access to markets is restricted, it could negatively impact our production, our income and ultimately our ability to retain our leases. Our ability to sell oil and natural gas and receive market prices for our oil and natural gas may be adversely affected by pipeline and gathering system capacity constraints.”
In addition to selling our oil and gas at the wellhead, weWe work with various pipeline companies to procure and to assure capacity for our natural gas. For further discussion of this matter, see “Item 1A. Risk Factors—If our access to markets is restricted, it could negatively impact our production, our income and ultimately our ability to retain our leases. Our ability to sell oil and natural gas and receive market prices for our oil and natural gas may be adversely affected by pipeline and gathering system capacity constraints.” We have entered into various long-term gathering, processing, and transportation contracts with various parties which require us to deliver fixed, determinable quantities of production over specified periods of time. Certain of these contracts require us to make payments for any shortfalls in delivering or transporting minimum volumes under these commitments. As of the filing of this report, we do not expect any material shortfalls in our delivery commitments. See “Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations—Contractual Obligations” and “Note 8. Commitments and Contingencies” of the Notes to our Consolidated Financial Statements for further discussion.
Competition and Technological Changes
We encounter competition from other oil and gas companies in all areas of our operations, including the acquisition of exploratory prospects and proven properties.properties, obtaining necessary equipment, supplies and services, and recruiting and retaining skilled employees. Many of our competitors are large, well-established companies that have been engaged in the oil and gas business for much longer than we have and possess substantially larger operating staffs and greater capital resources than we do. We may not be able to conduct our operations, evaluate and select suitable properties and consummate transactions successfully in this highly competitive environment.
The oil and gas industry is characterized by rapid and significant technological advancements and introductions of new products and services using new technologies. If one or more of the technologies we use now or in the future were to become obsolete or if we are unable to use the most advanced commercially available technology, our business, financial condition and results of operations could be materially adversely affected.
Regulation
Oil and gas operations are subject to various federal, state, local and international environmental regulations that may change from time to time, including regulations governing oil and gas production and transportation, federal and state regulations governing


environmental quality and pollution control and state limits on allowable rates of production by well or proration unit. These regulations may affect the amount of oil and gas available for sale, the availability of adequate pipeline and other regulated transportationprocessing and processingtransportation facilities and the marketing of competitive fuels. For example, a productive natural gas well may be “shut-in” because of an oversupply of natural gas or lack of an available natural gas pipeline in the areas in which we may conduct operations. State and federal regulations generally are intended to prevent waste of oil and gas, protect rights to produce oil and gas between owners in a common reservoir, control the amount of oil and gas produced by assigning allowable rates of production, provide nondiscriminatory access to common carrier pipelines and control contamination of the environment. Pipelines are subject to the jurisdiction of various federal, state and local agencies. We are also subject to changing and extensive tax laws, the effects of which cannot be predicted.
The following discussion summarizes the regulation of the United States oil and gas industry. We believe we are in substantial compliance with the various statutes, rules, regulations and governmental orders to which our operations may be subject, although we cannot assure you that this is or will remain the case. Moreover, those statutes, rules, regulations and government orders may be changed or reinterpreted from time to time in response to economic or political conditions, and any such changes or reinterpretations could materially adversely affect our results of operations and financial condition. The following discussion is not intended to constitute a complete discussion of the various statutes, rules, regulations and governmental orders to which our operations may be subject.
Regulation of Natural Gas and Oil Exploration and Production
Our operations are subject to various types of regulation at the federal, state and local levels that:
require permits for the drilling of wells;
mandate that we maintain bonding requirements in order to drill or operate wells; and

15



regulate the location of wells, the method of drilling and casing wells, the surface use and restoration of properties upon which wells are drilled, groundwater sampling requirements prior to drilling, the plugging and abandoning of wells and the disposal of fluids used in connection with operations.
Our operations are also subject to various conservation laws and regulations. These regulations govern the size of drilling and spacing units or proration units, setback rules, the density of wells that may be drilled in oil and gas properties and the unitization or pooling of oil and gas properties. In this regard, some states (including Colorado and Ohio) allow the forced pooling or integration of tracts to facilitate exploration while other states (including Texas) rely primarily or exclusively on voluntary pooling of lands and leases. In areas where pooling is primarily or exclusively voluntary, it may be more difficult to form units and therefore more difficult to develop a project if the operator owns less than 100% of the leasehold. In addition, state conservation laws that establish maximum rates of production from oil and gas wells generally prohibit the venting or flaring of natural gas and impose specified requirements regarding the ratability of production. The effect of these regulations may limit the amount of oil and gas we can produce from our wells and may limit the number of wells or the locations at which we can drill. The regulatory burden on the oil and gas industry increases our costs of doing business and, consequently, affects our profitability. Because these laws and regulations are frequently expanded, amended and reinterpreted, we are unable to predict the future cost or impact of complying with such regulations.
Regulation of Sales and Transportation of Natural Gas
Federal legislation and regulatory controls have historically affected the price of natural gas we produce and the manner in which our production is transported and marketed. Under the Natural Gas Act of 1938 (“NGA”), the Federal Energy Regulatory Commission (“FERC”) regulates the interstate transportation and the sale in interstate commerce for resale of natural gas. Effective January 1, 1993, the Natural Gas Wellhead Decontrol Act (the “Decontrol Act”) deregulated natural gas prices for all “first sales” of natural gas, including all of our sales of our own production. As a result, all of our domestically produced natural gas is sold at market prices, subject to the terms of any private contracts that may be in effect. The FERC’s jurisdiction over interstate natural gas transportation, however, was not affected by the Decontrol Act.
Under the NGA, facilities used in the production or gathering of natural gas are exempt from the FERC’s jurisdiction. We own certain natural gas pipelines that we believe satisfy the FERC’s criteria for establishing that these are all gathering facilities not subject to FERC jurisdiction under the NGA. State regulation of gathering facilities generally includes various safety, environmental, and in some circumstances, nondiscriminatory take requirements and complaint-based rate regulation. Some of the delay in bringing our natural gas to market has been the lack of available pipeline systems in the Marcellus and Utica, particularly those that would take natural gas production from the lease to existing infrastructure. In order to partly alleviate this issue, in the past, certain of our wholly owned subsidiaries have constructed non-jurisdictional gathering facilities in cases where we have determined that we can construct those facilities more quickly or more efficiently than waiting on an unrelated third-party pipeline company.
One of our pipeline subsidiaries, Hondo Pipeline Inc., may exercise the power of eminent domain and is a regulated public utility within the meaning of Section 101.003 (“GURA”) and Section 121.001 (the “Cox Act”) of the Texas Utilities Code. Both GURA and the Cox Act prohibit unreasonable discrimination in the transportation of natural gas and authorize the Texas Railroad Commission to regulate gas transportation rates. However, GURA provides for negotiated rates with transportation, industrial or similar large-volume contract customers so long as neither party has an unfair negotiating advantage, the negotiated rate is


substantially the same as that negotiated with at least two other customers under similar conditions, or sufficient competition existed when the rate was negotiated.
Although we do not own or operate any pipelines or facilities that are directly regulated by the FERC, its regulations of third-party pipelines and facilities could indirectly affect our ability to market our production. Beginning in the 1980s, the FERC initiated a series of major restructuring orders that required pipelines, among other things, to perform open access transportation, “unbundle” their sales and transportation functions, and allow shippers to release their pipeline capacity to other shippers. As a result of these changes, sellers and buyers of natural gas have gained direct access to the particular pipeline services they need and are better able to conduct business with a larger number of counterparties. We believe these changes generally have improved our access to markets while, at the same time, substantially increasing competition in the natural gas marketplace. It remains to be seen, however, what effect the FERC’s other activities will have on access to markets, the fostering of competition and the cost of doing business. We cannot predict what new or different regulations the FERC and other regulatory agencies may adopt, or what effect subsequent regulations may have on our activities.
In the past, Congress has been very active in the area of natural gas regulation. However, the more recent trend has been in favor of deregulation or “lighter handed” regulation and the promotion of competition in the gas industry. In light of this increased reliance on competition, the Energy Policy Act of 2005 amended the NGA to prohibit any forms of market manipulation in connection with the transportation, purchase or sale of natural gas. In addition to the regulations implementing these prohibitions, the FERC has established new regulations that are intended to increase natural gas pricing transparency through, among other

16



things, expanded dissemination of information about the availability and prices of gas sold and new regulations that require both interstate pipelines and certain non-interstate pipelines to post daily information regarding their design capacity and daily scheduled flow volumes at certain points on their systems. The Energy Policy Act of 2005 also significantly increased the penalties for violations of the NGA and the FERC’s regulations to up to $1.0 million per day for each violation. This maximum penalty authority established by statute has been and will continue to be adjusted periodically to account for inflation.
Oil Price Controls and Transportation Rates
Our sales of crude oil, condensate and natural gas liquidsNGLs are not currently regulated and are made at market prices. The price we receive from the sale of these products may be affected by the cost of transporting the products to market. Much of that transportation is through interstate common carrier pipelines. Effective as of January 1, 1995, the FERC implemented regulations generally grandfathering all previously approved interstate transportation rates and establishing an indexing system for those rates by which adjustments are made annually based on the rate of inflation, subject to specified conditions and limitations. These regulations may tend to increase the cost of transporting crude oil and natural gas liquidsNGLs by interstate pipeline, although the annual adjustments may result in decreased rates in a given year. Every five years, the FERC must examine the relationship between the annual change in the applicable index and the actual cost changes experienced in the oil pipeline industry. In December 2015, to implement the latest required five-yearly re-determination, the FERC established an upward adjustment in the index to track oil pipeline cost changes. For the five-year period beginning July 1, 2016, FERC established an annual index adjustment equal to the change in the producer price index for finished goods plus 1.23%. Under FERC’s regulations, liquids pipelines can request a rate increase that exceeds the rate obtained through application of the indexing methodology by using a cost-of-service approach, but only after the pipeline establishes that a substantial divergence exists between the actual costs experienced by the pipeline and the rates resulting from application of the indexing methodology. We are not able at this time to predict the effects of this indexing system or any new FERC regulations on the transportation costs associated with oil production from our oil producing operations.
There regularly are legislative proposals pending in the federal and state legislatures which, if enacted, would significantly affect the petroleum industry. At the present time, it is impossible to predict what proposals, if any, might actually be enacted by Congress or the various state legislatures and what effect, if any, such proposals might have on us. Similarly, we cannot predict whether or to what extent the trend toward federal deregulation of the petroleum industry will continue, or what the ultimate effect on our sales of oil, gas and other petroleum products will be.


Environmental Regulations
Our operations are subject to numerous international, federal, state and local laws and regulations governing the discharge of materials into the environment or otherwise relating to environmental protection. These laws and regulations may require the acquisition of a permit before drilling commences, restrict the types, quantities and concentration of various substances that can be released into the environment in connection with drilling and production activities, limit or prohibit drilling activities on specified lands within wilderness, wetlands and other protected areas, require remedial measures to mitigate pollution from former operations, such as pit closure and plugging abandoned wells, and impose substantial liabilities for pollution resulting from production and drilling operations. The failure to comply with these laws and regulations may result in the assessment of administrative, civil and criminal penalties, imposition of investigatory or remedial obligations or the issuance of injunctions prohibiting or limiting the extent of our operations. Public interest in the protection of the environment has increased dramatically in recent years. The trend of applying more expansive and stricter environmental legislation and regulations to the oil and gas industry could continue, resulting in increased costs of doing business and consequently affecting our profitability. To the extent laws are enacted or other governmental action is taken that restricts drilling or imposes more stringent and costly waste handling, disposal and cleanup requirements, our business and prospects could be adversely affected.
We currently own or lease numerous properties that for many years have been used for the exploration and production of oil and gas. Although we believe that we have generally implemented appropriate operating and waste disposal practices, prior owners and operators of these properties may not have used similar practices, and hydrocarbons or other waste may have been disposed of or released on or under the properties we own or lease or on or under locations where such waste has been taken for disposal. In addition, many of these properties have been operated by third parties whose treatment and disposal or release of hydrocarbons or other waste was not under our control. These properties and the waste disposed thereon may be subject to the federal Resource Conservation and Recovery Act (“RCRA”), the Comprehensive Environmental Response, Compensation and Liability Act (“CERCLA”), and analogous state laws as well as state laws governing the management of oil and gas waste. Under these laws, we could be required to remove or remediate previously disposed waste (including waste disposed of or released by prior owners or operators) or property contamination (including groundwater contamination) or to perform remedial plugging operations to prevent future contamination.
We generate waste that may be subject to RCRA and comparable state statutes. The U.S. Environmental Protection Agency (“EPA”(the “EPA”), and various state agencies have limited the approved methods of disposal for certain hazardous and nonhazardous waste. Furthermore, certain waste generated by our oil and gas operations that are currently exempt from treatment as “hazardous waste”

17



may in the future be designated as “hazardous waste” and therefore become subject to more rigorous and costly operating and disposal requirements.
CERCLA, also known as the “Superfund” law, and analogous state laws impose liability, without regard to fault or the legality of the original conduct, on specified classes of persons that are considered to have contributed to the release of a “hazardous substance” into the environment. These classes of persons include the owner or operator of the disposal site or sites where the release occurred and companies that disposed or arranged for the disposal of the hazardous substances found at the site. Persons who are or were responsible for releases of hazardous substances under CERCLA may be subject to joint and several liability for the costs of cleaning up the hazardous substances that have been released into the environment, for damages to natural resources and for the costs of certain health studies. It is not uncommon for neighboring landowners and other third parties to file claims for personal injury and property damage allegedly caused by the hazardous substances released into the environment.
Our operations may be subject to the Clean Air Act and comparable state and local requirements. In 1990 Congress adopted amendments to the Clean Air Act containing provisions that have resulted in the gradual imposition of certain pollution control requirements with respect to air emissions from our operations. The EPA and states have developed and continue to develop regulations to implement these requirements. We may be required to incur certain capital expenditures in the next several years for air pollution control equipment in connection with maintaining or obtaining operating permits and approvals addressing other air emission-related issues. Moreover, changes in environmental laws and regulations occur frequently, and stricter laws, regulations or enforcement policies could significantly increase our compliance costs. Further, stricter requirements could negatively impact our production and operations. For example, in 2012on October 1, 2015, the EPA released a final rule tightening the primary and secondary NAAQS for ground-level ozone from its 2008 standard levels of 75 parts per billion (“ppb”) to 70 ppb. None of the Texas Commission on Environmental Quality revised certain air permit programs by significantly increasing the air permitting requirements for new and certain existing oil and gas production and gathering sites for 23 counties in which we operate have been designated by the Barnett production area.EPA as nonattainment areas under this revised standard. However, areas in which we operate could be designated as nonattainment in the future if the EPA were to further reduce ozone standards. States that contain any areas designated nonattainment, and any tribes that choose to do so, are required to develop state implementation plans demonstrating how the area will attain the standard within a prescribed period of time. These plans may require the installation of additional equipment to control emissions. Similar initiatives could lead to more stringent air permitting, increased regulation and possible enforcement actions at the local, state, and federal levels.


Additionally, the EPA has established new air emission control requirements for natural gas and natural gas liquidsNGLs production, processing and transportation activities, including New Source Performance Standards to address emissions of sulfur dioxide and volatile organic compounds, and National Emission Standards for Hazardous Air Pollutants (“NESHAPS”) to address hazardous air pollutants frequently associated with gas production and processing activities. Among other things, these rules require the reduction of volatile organic compound emissions from natural gas wells through the use of reduced emission completions or “green completions” on all hydraulically fractured wells constructed or refractured after January 1, 2015. In addition, gas wells are required to use completion combustion device equipment (i.e., flaring) by October 15, 2012 if emissions cannot be directed to a gathering line. Further, the final rules under NESHAPS include maximum achievable control technology (“MACT”) standards for “small” glycol dehydrators that are located at major sources of hazardous air pollutants and modifications to the leak detection standards for valves. More recently, in September 2015,In June 2016, the EPA published proposed updates to new source performance standard requirements that would impose more stringent controls on methane and volatile organic compounds emissions from oil and gas development and production operations, including hydraulic fracturing and other well completion activity. In October 2018, the EPA published a proposed rule that would amend certain requirements of the June 2016 rule. Among other things, the proposed rule would reduce monitoring frequencies for fugitive emissions and clarify and streamline certain other requirements. However, the 2016 rule currently remains in effect. Similarly in JanuaryNovember 2016, the BLM proposedBureau of Land Management (“BLM”) issued rules to requirerequiring additional efforts by producers to reduce venting, flaring, and leaking of natural gas produced on federal and Native American lands. In February 2018, the BLM proposed to repeal certain requirements of the 2016 rules. In September 2018, BLM published a final rule that largely adopted the February 2018 proposal and rescinded several requirements. The September 2018 rule was challenged in the U.S. District Court for the Northern District of California almost immediately after issuance. The challenge is still pending. Compliance with these requirementsthe November 2016 rule or the revised September 2018 rule may require modifications to certain of our operations, including the installation of new equipment to control emissions at the well site that could result in significant costs, including increased capital expenditures and operating costs, and could adversely impact our business.
Federal regulations require certain owners or operators of facilities that store or otherwise handle oil, such as us, to prepare and implement spill prevention, control, countermeasure and response plans relating to the possible discharge of oil into surface waters. The Oil Pollution Act of 1990 (“OPA”) contains numerous requirements relating to the prevention of and response to oil spills into waters of the United States. The OPA subjects owners and operators of facilities to strict joint and several liability for all containment and cleanup costs and certain other damages arising from a spill, including, but not limited to, the costs of responding to a release of oil to surface waters. The OPA also requires owners and operators of offshore facilities that could be the source of an oil spill into federal or state waters, including wetlands, to post a bond, letter of credit or other form of financial assurance in amounts ranging from $10.0 million in specified state waters to $35.0 million in federal outer continental shelf waters to cover costs that could be incurred by governmental authorities in responding to an oil spill. These financial assurances may be increased by as much as $150.0 million if a formal risk assessment indicates that the increase is warranted. Noncompliance with OPA may result in varying civil and criminal penalties and liabilities.
Our operations are also subject to the federal Clean Water Act (“CWA”) and analogous state laws that impose restrictions and strict controls regarding the discharge of pollutants into state waters as well as U.S. waters. Pursuant to the requirements of the CWA, the EPA has adopted regulations concerning discharges of storm water runoff. This program requires covered facilities to obtain individual permits or seek coverage under an EPA general permit. Like OPA, the CWA and analogous state laws relating to the control of water pollution provide varying civil and criminal penalties and liabilities for releases of petroleum or its derivatives into surface waters or into the ground. Similarly, the U.S. Congress has considered legislation to subject hydraulic fracturing operations to federal regulation and to require the disclosure of chemicals used by us and others in the oil and gas industry in the

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hydraulic fracturing process. Please read “Item 1A. Risk Factors—WeFactors-We are subject to various environmental risks and governmental regulations, including those relating to benzene emissions, hydraulic fracturing and global climate change, and future regulations may be more stringent resulting in increased operating costs and decreased demand for the oil and gas that we produce.”
The Endangered Species Act (“ESA”) restricts activities that may affect endangered or threatened species or their habitats. Some of our operations are located in or near areas that may be designated as habitats for endangered or threatened species, such as the Indiana Bat and the Attwater’s Prairie Chicken.prairie chicken. In these areas, we may be obligated to develop and implement plans to avoid potential adverse effects to protected species and their habitats, and we may be prohibited from conducting operations in certain locations or during certain seasons, such as breeding and nesting seasons, when our operations could have an adverse effect on the species. It is also possible that a federal or state agency could restrict drilling activities in certain locations if it is determined that such activities may have a serious adverse effect on a protected species. The presence of a protected species in areas where we operate could result in increased costs of or limitations on our ability to perform operations and thus have an adverse effect on our business. We believe that we are in substantial compliance with the ESA, and we are not aware of any proposed listings that will affect our operations. However, the designation of previously unidentified endangered or threatened species could cause us to incur additional costs or become subject to operating restrictions or bans in the affected states.
The Safe Drinking Water Act (“SDWA”) and comparable local and state provisions restrict the disposal, treatment or release of water produced or used during oil and gas development. Subsurface emplacement of fluids (including disposal wells or enhanced


oil recovery) is governed by federal or state regulatory authorities that, in some cases, includes the state oil and gas regulatory authority or the state’s environmental authority. These regulations may increase the costs of compliance for some facilities. We believe that we substantially comply with the SDWA and related state provisions.
We also are subject to a variety of federal, state, local and foreign permitting and registration requirements relating to protection of the environment. We believe we are in substantial compliance with current applicable environmental laws and regulations and that continued compliance with existing requirements will not have a material adverse effect on our financial position or results of operations.
Global Climate Change
There is increasing attention in the United States and worldwide being paid to the issue of climate change and the contributing effect of greenhouse gas (“GHG”) emissions. The EPA has adopted regulations under existing provisions of the federal Clean Air Act that, among other things, regulates GHG emissions from certain large stationary sources under the Clean Air Act Prevention of Significant Deterioration (“PSD”) and Title V permitting programs. Facilities required to obtain PSD permits for their GHG emissions also will be required to meet “best available control technology” standards, which will be established by the states or, in some instances, by the EPA on a case-by-case basis. The EPA also expanded its existing GHG emissions reporting rule to apply to the oil and gas source category, including oil and natural gas production facilities and natural gas processing, transmission, distribution and storage facilities. Facilities containing petroleum and natural gas systems that emit 25,000 metric tons or more of CO2 equivalent per year were required to report annual GHG emissions to the EPA, for the first time by September 28, 2012. In addition, in September 2015,June 2016, the EPA published proposed updates to new source performance standard requirements that would impose more stringent controls on methane and volatile organic compounds emissions from oil and gas development and production operations, including hydraulic fracturing and other well completion activity. In October 2018, the EPA published a proposed rule that would amend certain requirements of the June 2016 rule. Among other things, the proposed rule would reduce monitoring frequencies for fugitive emissions and clarify and streamline certain other requirements. However, the 2016 rule currently remains in effect.
The U.S. Congress has considered a number of legislative proposals to restrict GHG emissions and more than 20 states, either individually or as part of regional initiatives, have begun taking actions to control or reduce GHG emissions. Efforts have been made and continue to be made in the international community toward the adoption of international treaties or protocols that would address global climate change issues. Most recently in 2015,In April 2016, the United States participated in the United Nations Conference on Climate Change, which led to the creation ofsigned the Paris Agreement. The Paris Agreement, will be open for signing on April 22, 2016 and will requirewhich requires countries to review and “represent a progression” in their intended nationally determined contributions, which set GHG emission reduction goals, every five years beginning in 2020. However, in August of 2017, the United States informed the United Nations of its intent to withdraw from the Paris Agreement. The earliest possible effective withdrawal date from the Paris Agreement is November 2020.
While it is not possible at this time to predict how regulation that may be enacted to address GHG emissions would impact our business, the modification of existing laws or regulations or the adoption of new laws or regulations curtailing oil and gas exploration in the areas of the United States in which we operate could materially and adversely affect our operations by limiting drilling opportunities or imposing materially increased costs. In addition, existing or new laws, regulations or treaties (including incentives to conserve energy or use alternative energy sources) could have a negative impact on our business if such incentives reduce demand for oil and gas.
In addition to the effects of future regulation, the meteorological effects of global climate change could pose additional risks to our operations in the form of more frequent and/or more intense storms and flooding, which could in turn adversely affect our cost of doing business.

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Title to Properties; Acquisition RisksProperties
We believe we currently have satisfactory title to all of our producing properties in the specific areas in which we operate in accordance with standards generally accepted in the oil and gas industry, except where failure to do so would not have a material adverse effect on our business and operations in such area, taken as a whole. Individual properties may be subject to burdens such as royalty and overriding royalty interests, working and other outstanding interests customary in the industry. Additionally, substantially all of our producing properties are subject to mortgage liens securing our obligations under our senior secured revolving credit facility. For additional information, please see “Item 1A. Risk Factors—We may incur losses as a result of title deficiencies.”


Customers
The following table presents customers that representrepresented 10% or more of our total revenues for at least 10%one of our crude oil and natural gas revenues for each respective year:the periods presented:
Year Ended December 31,Years Ended December 31,
2015 2014 20132018 2017 2016
Shell Trading (US) Company65% 44% 47%73% 69% 56%
Flint Hills Resources, LP(a) 26% 23%* * 15%
 
(a)Revenues from the customer were below 10% during the year.
* - Less than 10% for the respective year.
We do not believe the loss of any one of our purchasers would materially affect our ability to sell the crude oil and natural gas we produce as other purchasers are available in our primary areas of activity. See “Additional Oil and Gas Disclosures—Marketing.”
Employees
At December 31, 20152018, we had 215239 full-time employees. We believe thatNone of our relationshipsemployees are subject to a collective bargaining agreement, and we consider our relations with our employees are satisfactory.to be good.
In order to optimize prospect generationWe regularly use independent contractors and development, we utilize the services of independent consultants and contractors to perform various professional services, particularly in the areas of 3-D seismic data mapping, acquisition of leases and lease options, construction, design, well site surveillance, permitting and environmental assessment. Independent contractors generally provide field and on-site production operation services, such as pumping, maintenance, dispatching, inspection and testing. We believe that this use of third-party service providers has enhanced our ability to manage general and administrative expenses.other services.
Available Information
Our website can be accessed at www.carrizo.com. We make our website content available for informational purposes only. It should not be relied upon for investment purposes, nor is it incorporated by reference in this Form 10-K. WeWithin our website’s investor relations section, we make available on our website, through a direct link to the SEC’s website at www.sec.gov, free of charge our Annual Reportannual reports on Form 10-K, quarterly reports on Form 10-Q and current reports on Form 8-K, including exhibits and amendments to thosethese reports, as soon as reasonably practicable after we electronically file such materialsmaterial with, or furnish themsuch material to, the SEC. You may read and copy any materials we fileReports filed with the SEC are made available on its website at the SEC’s Public Reference Room at 100 F Street NE, Washington, D.C. 20549. You may obtain information regarding the Public Reference Room by calling the SEC at 1-800-SEC-0330.
You maywww.sec.gov.We also findmake available through our website information related to our corporate governance board committees and company code of ethics at our website. Among the information you can find there isincluding the following:
Audit Committee Charter;
Compensation Committee Charter;
Nominating and Corporate Governance Committee Charter;
Code of Ethics and Business Conduct; and
Compliance Employee Report Line.
We intend to satisfy the requirement under Item 5.05 of Form 8-K to disclose any amendments to our Code of Ethics and Business Conduct and any waiver from a provision of our Code of Ethics by posting such information on our website at www.carrizo.com under “About Us—“About—Governance.”

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Glossary of Certain Industry Terms
The definitions set forth below shall apply to the indicated terms as used herein.
3-D seismic data. Three-dimensional pictures of the subsurface created by collecting and measuring the intensity and timing of sound waves transmitted into the earth as they reflect back to the surface.
Bbl. One stock tank barrel, or 42 U.S. gallons liquid volume, used herein in reference to oil or other liquid hydrocarbons.
Bbls/d. Stock tank barrels per day.
Bcf.Boe. Billion cubic feet of natural gas.
Boe. BarrelBarrels of oil equivalent. A Boe is determined using the ratio of 6,000 cubic feet6 Mcf of natural gas to one Bbl of oil condensate or natural gas liquids,NGLs which approximates thetheir relative energy content of oil, condensate and natural gas liquids as compared to natural gas. Despite holding this ratio constant at six Mcf to one Bbl, prices have historically often been higher or substantially higher for oil than natural gas on an energy equivalent basis, although there have been periods in which they have been lower or substantially lower.content.
Boe/d. Barrels of oil equivalent per day.
Btu or British Thermal Unit. The quantity of heat required to raise the temperature of a one-pound mass of water by one degree Fahrenheit.
Carried interest.An agreement under which one party (carrying party) agrees to pay for a specified portion or for all of the drilling and completion and operating costs of another party (carried party) on a property for a specified time in which both own a portion of the working interest. The carrying party may be able to recover a specified amount of costs from the carried party’s share of the revenue from the production of reserves from the property.

Completion. The process of treating a drilled well followed by the installation of permanent equipment for the production of oil, NGLs or natural gas, or in the case of a dry well, the reporting of abandonment to the appropriate authority.
Condensate. Condensate is a mixture of hydrocarbons that exists in the gaseous phase at original reservoir temperature and pressure, but that, when produced, is in the liquid phase at surface pressure and temperature.
Developed acreage. The number of acres allocated or assignable to productive wells or wells capable of production.
Developed oil and gas reserves. Reserves of any category that can be expected to be recovered (i) through existing wells with existing equipment and operating methods or for which the cost of the required equipment is relatively minor compared to the cost of a new well, and (ii) through installed extraction equipment and infrastructure operational at the time of the reserves estimate if the extraction is by means not involving a well.
Development costs. Costs incurred to obtain access to proved reserves and to provide facilities for extracting, treating, gathering and storing the oil and gas. Development costs, including depreciation and applicable operating costs of support equipment and facilities and other costs of development activities, are costs incurred to (i) gain access to and prepare well locations for drilling, including surveying well locations for the purpose of determining specific development drilling sites, clearing ground, draining, road building and relocating public roads, gas lines and power lines, to the extent necessary in developing the proved reserves, (ii) drill and equip development wells, development-type stratigraphic test wells and service wells, including the costs of platforms and of well equipment such as casing, tubing, pumping equipment, and the wellhead assembly, (iii) acquire, construct and install, production facilities such as lease flow lines, separators, treaters, heaters, manifolds, measuring devices and production storage tanks, natural gas cycling and processing plants, and central utility and waste disposal systems, and (iv) provide improved recovery systems.
Development well. A well drilled within the proved area of an oil or natural gas reservoir to the depth of a stratigraphic horizon known to be productive.
Dry well. An exploratory, development or extension well that proves to be incapable of producing either oil or gas in sufficient quantities to justify completion as an oil or gas well.
Economically producible. A resource which generates revenue that exceeds, or is reasonably expected to exceed, the costs of the operation. The value of the products that generate revenue shall be determined at the terminal point of “oil and gas producing activities” as defined in Rule 4-10(a)(16) of Regulation S-X promulgated under the Securities Exchange Act of 1934, as amended.

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Estimated ultimate recovery (EUR). Estimated ultimate recovery is the sum of reserves remaining as of a given date and cumulative production as of that date.
Exploratory well. A well drilled to find a new field or to find a new reservoir in a field previously found to be productive of oil or gas in another reservoir.
Field. An area consisting of a single reservoir or multiple reservoirs all grouped on or related to the same individual geological structural feature or stratigraphic condition, or both. The geological terms “structural feature” and “stratigraphic condition” are intended to identify localized geological features as opposed to the broader terms of basins, trends, provinces, plays, areas of interest, etc.
Gross acres or gross wells. The total acres or wells, as the case may be, in which a working interest is owned.
Hydraulic fracturing. Hydraulic fracturing is a well stimulation process using a liquid (usually water with an amount of chemicals mixed in) that is forced into an underground formation under high pressure to open or enlarge fractures in reservoirs with low permeability to stimulate and improve the flow of hydrocarbons from these reservoirs. As the formation is fractured, a proppant (usually sand or ceramics) is pumped into the fractures to “prop” or keep them from closing after they are opened by the liquid. Hydraulic fracturing is an essentiala technology used in shale reservoirs and other unconventional resource plays where nearly all wells are fractured in order to enable commercial hydrocarbon production.
MBbls. Thousand barrels of oil or other liquid hydrocarbons.
MBoe. Thousand barrels of oil equivalent.
Mcf. Thousand cubic feet of natural gas.
Mcf/d. Thousand cubic feet of natural gas per day.
Mcfe. Thousand cubic feet equivalent, determined using the ratio of six Mcf of natural gas to one Bbl of oil, or condensate or one Boe of natural gas liquids, which represents the approximate energy content of oil, condensate and natural gas liquids as compared to natural gas. Despite holding this ratio constant at six Mcf to one Bbl, prices have historically often been higher or substantially higher for oil than natural gas on an energy equivalent basis, although there have been periods in which they have been lower or substantially lower.
MMBbls. Million barrels of oil or other liquid hydrocarbons.


MMBoe.MMBoe. Million barrels of oil equivalent.
MMBtu. Million British Thermal Units.
MMcf. Million cubic feet of natural gas.
MMcf/d. Million cubic feet of natural gas per day.
MMcfe. Million cubic feet of natural gas equivalent, determined using the ratio of six Mcf of natural gas to one Bbl of oil, condensate or natural gas liquids, which represents the approximate energy content of oil, condensate and natural gas liquids as compared to natural gas. Despite holding this ratio constant at six Mcf to one Bbl, prices have historically often been higher or substantially higher for oil than natural gas on an energy equivalent basis, although there have been periods in which they have been lower or substantially lower.
MMcfe/d. Million cubic feet of natural gas equivalent per day.
Net acres or net wells. The sum of the fractional working interests owned in gross acres or gross wells.
Non-productive well. A well that is found to be incapable of producing oil or gas in sufficient quantities to justify completion, or upon completion, the economic operation of an oil or gas well.
NYMEX. New York Mercantile Exchange.
Production costs. Costs incurred to operate and maintain wells and related equipment and facilities, including depreciation and applicable operating costs of support equipment and facilities and other costs of operating and maintaining those wells and related equipment and facilities.
Productive well. A well that is found to be capable of producing oil or gas in sufficient quantities to justify completion as an oil or gas well.

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Proved developed reserves. Reserves that can be expected to be recovered through existing wells with existing equipment and operating methods.
Proved reserves. Has the meaning given to such term in Rule 4-10(a)(22) of Regulation S-X, which defines proved reserves as:
The quantities of oil and gas which, by analysis of geoscience and engineering data, can be estimated with reasonable certainty to be economically producible from a given date forward, from known reservoirs, and under existing economic conditions, operating methods, and government regulations, prior to the time at which contracts providing the right to operate expire, unless evidence indicates that renewal is reasonably certain, regardless of whether deterministic or probabilistic methods are used for estimation. The project to extract the hydrocarbons must have commenced or the operator must be reasonably certain that it will commence the project within a reasonable time.
The area of a reservoir considered proved includes (i) the area identified by drilling and limited by fluid contacts, if any, and (ii) adjacent undrilled portions of the reservoir that can, with reasonable certainty, be judged to be continuous with it and to contain economically producible oil or gas on the basis of available geoscience and engineering data.
In the absence of data on fluid contacts, proved quantities in a reservoir are limited by the lowest known hydrocarbons as seen in a well penetration unless geoscience, engineering or performance data and reliable technology establish a lower contact with reasonable certainty.
Where direct observation from well penetrations has defined a highest known oil elevation and the potential exists for an associated gas cap, proved oil reserves may be assigned in the structurally higher portions of the reservoir only if geoscience, engineering or performance data and reliable technology establish the higher contact with reasonable certainty.
Reserves that can be produced economically, based on prices used to estimate reserves, through application of improved recovery techniques (including, but not limited to, fluid injection) are included in the proved classification when (i) successful testing by a pilot project in an area of the reservoir with properties no more favorable than in the reservoir as a whole, the operation of an installed program in the reservoir, or an analogous reservoir, or other evidence using reliable technology establishes the reasonable certainty of the engineering analysis on which the project or program was based and (ii) the project has been approved for development by all necessary parties and entities, including governmental entities.
Existing economic conditions include prices and costs at which economic producibility from a reservoir is to be determined. The price shall be the average price during the 12-month period prior to the ending date of the period covered by the report, determined as an unweighted arithmetic average of the first-day-of-the-month price for each month within such period, unless prices are defined by contractual arrangements, excluding escalations based upon future conditions.
Proved undeveloped reserves.oil and gas reserves or PUDs. Reserves that are expected to be recovered from new wells on undrilled acreage or from existing wells where a relatively major expenditure is required for recompletion.
(i) Reserves on undrilled acreage are limited to those directly offsetting development spacing areas that are reasonably certain of production when drilled, unless evidence using reliable technology exists that establishes reasonable certainty of economic producibility, based on pricing used to estimate reserves, at greater distances.


(ii) Undrilled locations are classified as having proved undeveloped reserves only if a development plan has been adopted indicating that they are scheduled to be drilled within five years, unless the specific circumstances justify a longer time.
(iii) Under no circumstances are estimates for proved undeveloped reserves attributable to any acreage for which an application of fluid injection or other improved recovery technique is contemplated, unless such techniques have been proved effective by actual projects in the same reservoir or an analogous reservoir or by other evidence using reliable technology establishing reasonable certainty.
PV-10 value.(Non-GAAP). When used with respect to oil and gas reserves,The present value or PV-10, means theof estimated future gross revenue to be generated from the production of estimated net proved reserves, net of estimated production and future development and abandonment costs, usingbased on prices calculated asused in estimating the average oil and gas price during the preceding 12-month period prior to the end of the current reporting period, (determined as the unweighted arithmetic average of prices on the first day of each month within the 12-month period)proved reserves and costs in effect atas of the determination date andindicated (unless such costs are subject to change pursuant to contractual provisions), without giving effect to non-property related expenses such as general and administrative expenses, debt service, and future income tax expenseexpenses, or to depreciation, depletion, and amortization, discounted to a present value using an annual discount rate of 10%10 percent. While this measure does not include the effect of income taxes as it would in the use of the standardized measure of discounted future net cash flows calculation, it does provide an indicative representation of the relative value of the Company on a comparative basis to other companies and from period to period. This is a non-GAAP measure. See “Item 1. Business—Additional Oil and Gas Disclosures—Reconciliation of Standardized Measure of Discounted Future Net Cash Flows (GAAP) to PV-10 (Non-GAAP)”.
Reasonable certainty. If deterministic methods are used, reasonable certainty means a high degree of confidence that the quantities will be recovered. If probabilistic methods are used, there should be at least a 90% probability that the quantities actually recovered will equal or exceed the estimate. A high degree of confidence exists if the quantity is much more likely to be achieved than not, and, as changes due to increased availability of geoscience (geological, geophysical, and geochemical), engineering, and economic data are made to EUR with time, reasonably certain EUR is much more likely to increase or remain constant than to decrease.
Recompletion. The completion for production of an existing well bore in another formation from that in which the well has been previously completed.
Reserves. Estimated remaining quantities of oil and gas and related substances anticipated to be economically producible, as of a given date, by application of development projects to known accumulations. In addition, there must exist, or there must be a reasonable expectation that there will exist, the legal right to produce or a revenue interest in the production, installed means of delivering oil and gas or related substances to market, and all permits and financing required to implement the project.

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Reservoir. A porous and permeable underground formation containing a natural accumulation of producible oil or gas, or both, that is confined by impermeable rock or water barriers and is individual and separate from other reservoirs.
Standardized measure. The present value, discounted at 10%, of future net cash flows from estimated proved reserves after income taxes, calculated holding prices and costs constant at amounts in effect on the date of the report (unless such prices or costs are subject to change pursuant to contractual provisions) and otherwise in accordance with the U.S. Securities Exchange Commission’s rules for inclusion of oil and gas reserve information in financial statements filed with the U.S. Securities Exchange Commission.
Undeveloped acreage. Lease acreage on which wells have not been drilled or completed to a point that would permit the production of economic quantities of oil or gas regardless of whether such acreage contains proved reserves.
Undeveloped oil and gas reserves. Reserves of any category that are expected to be recovered from new wells on undrilled acreage, or from existing wells where a relatively major expenditure is required for recompletion.
(i) Reserves on undrilled acreage are limited to those directly offsetting development spacing areas that are reasonably certain of production when drilled, unless evidence using reliable technology exists that establishes reasonable certainty of economic producibility, based on pricing used to estimate reserves, at greater distances.
(ii) Undrilled locations are classified as having undeveloped reserves only if a development plan has been adopted indicating that they are scheduled to be drilled within five years, unless the specific circumstances justify a longer time.
(iii) Under no circumstances are estimates for undeveloped reserves attributable to any acreage for which an application of fluid injection or other improved recovery technique is contemplated, unless such techniques have been proved effective by actual projects in the same reservoir or an analogous reservoir or by other evidence using reliable technology establishing reasonable certainty.
Working interest. The operating interest that gives the owner the right to drill, produce and conduct operating activities on the property and a share of production.


Item 1A. Risk Factors
Oil and gas prices are highly volatile, and continued low oil and gas prices or further price decreases will negatively affect our financial position, planned capital expenditures and results of operations.
Our revenue, profitability, cash flow, future growth and ability to borrow funds or obtain additional capital, as well as the carrying value of our properties, are substantially dependent on prevailing prices of oil and gas. Historically, the markets for oil and gas have been volatile, and those markets are likely to continue to be volatile in the future. Oil and gas commodity prices are affected by events beyond our control, including changes in market supply and demand, overall economic activity, weather, pipeline capacity constraints, inventory storage levels, basis differentials and other factors. In the past, we have reduced or curtailed productionactivity to mitigate the impact of low oil and gas prices. Particularly in recent years, decreases in both oil and gas prices led us to suspend or curtail drilling and other exploration activities, which will limit our ability to produce oil and gas and therefore impact our revenues. Beginning the second half of 2014 and continuing into 2016, oil prices declined significantly. We are particularly dependent on the production and sale of oil and this commodity price decline has had, and may continue to have, an adverse effect on us. Further volatility in oil and gas prices or a continued prolonged period of low oil or gas prices may materially adversely affect our financial position, liquidity (including our borrowing capacity under our revolving credit facility), ability to finance planned capital expenditures and results of operations.
It is impossible to predict future oil and gas price movements with certainty. Prices for oil and gas are subject to wide fluctuation in response to relatively minor changes in the supply of and demand for oil and gas, market uncertainty and a variety of additional factors beyond our control. These factors include, but are not limited to:
the level of consumer product demand;
the levels and location of oil and gas supply and demand and expectations regarding supply and demand, including the supply of oil and natural gas due to increased production from resource plays;
overall economic conditions;
weather conditions;
domestic and foreign governmental relations, regulations and taxes;
the price and availability of alternative fuels;
political conditions or hostilities and unrest in oil producing regions;

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the level and price of foreign imports of oil and liquefied natural gas;
the ability of the members of the Organization of Petroleum Exporting Countries and other exporting nations to agree upon and maintain production constraints and oil price controls;
the extent to which U.S. shale producers become “swing producers” adding or subtracting to the world supply;
technological advances affecting energy consumption;
speculation by investors in oil and gas; and
variations between product prices at sales points and applicable index prices.
The profitability of wells, particularly in the shale plays in which we primarily operate, areis generally reduced or eliminated as commodity prices decline. In addition, certain wells that are profitable may not meet our internal return targets. Based on our current estimates of drilling and completion costs, ultimate recoveries per well, differentials and operating costs, we believe few, if any,a portion of our drilling locationsacreage if drilled would not be economical at the commodity price lows seenprices existing in early 2016, and wells drilled on our drilling locations in the Utica, Niobrara and Marcellus are not expected to be profitable unless prices increase significantly from even higher more recent prices.2018. There can be no assurance, however, that any wells, including wells drilled on our Eagle Ford and Delaware Basin acreage, will actually be profitable at suchany estimated prices. Additionally, failure to drill such wells because they are not profitable or for other reasons may substantially affect our acreage that is not currently held by production, as the primary term of the leases for a majority of such acreage will expire by the end of 2018 if no production is established on such acreage. The sustained declines in commodity prices have caused us to significantly reduce our exploration and development activity which may adversely affect our results of operations, cash flows and our business. Substantially all of our production is sold to purchasers under short-term (less than twelve-month) contracts at market-based prices. Low oil and natural gas prices will reduce our cash flows, borrowing ability, the present value of our reserves and our ability to develop future reserves. Low oil and natural gas prices may also reduce the amount of oil and natural gas that we can produce economically and may affect the quantity of our proved reserves.
Low commodity prices have led us to recognize an impairment of our oil and gas properties and continued lower commodity prices or additional commodity price declines will likely lead to additional impairments in future periods, which could have a material adverse effect on our results of operations. See “—If oil and natural gas prices continue to decline, or remain at low levels, we expect to be required to record additional impairments of oil and gas properties that would constitute a charge to earnings and reduce our shareholders’ equity.”
Oil and gas drilling is a speculative activity and involves numerous risks and substantial and uncertain costs that could adversely affect us.
Our success will be largely dependent upon the success of our drilling program. We acquire unproved properties and lease undeveloped acreage that we believe will enhance our growth potential and increase our earnings over time. However, we cannot assure you that all prospects will be economically viable or that we will not abandon our investments.
Drilling for oil and gas involves numerous risks, including the risk that no commercially productive oil or gas reservoirs will be discovered. The cost of drilling, completing and operating wells is substantial and uncertain, and drilling operations may be curtailed, delayed or canceled as a result of a variety of factors beyond our control, including:
unexpected or adverse drilling conditions;


elevated pressure or irregularities in geologic formations;
equipment failures or accidents;
adverse weather conditions;
fluctuations in the price of oil and gas;
surface access restrictions;
loss of title or other title related issues;
compliance with governmental requirements; and
shortages or delays in the availability of midstream transportation, drilling rigs, crews and equipment.
Because we identify the areas desirable for drilling in certain areas from 3-D seismic data covering large areas, we may not seek to acquire an option or lease rights until after the seismic data is analyzed or until the drilling locations are also identified; in those cases, we may not be permitted to lease, drill or produce oil or gas from those locations.

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Even if drilled, our completed wells may not produce reserves of oil or gas that are economically viable or that meet our earlier estimates of economically recoverable reserves. Our overall drilling success rate or our drilling success rate for activity within a particular project area may decline. Unsuccessful drilling activities could result in a significant decline in our production and revenues and materially harm our operations and financial position by reducing our available cash and resources. The potential for production decline rates for our wells could be greater than we expect. Because of the risks and uncertainties of our business, our future performance in exploration and drilling may not be comparable to our historical performance described herein.
We may not adhere to our proposed drilling schedule.
Our final determination of whether to drill any wells will be dependent on a number of factors, including:
the results of our exploration efforts and the acquisition, review and analysis of the seismic data;
the availability and cost of sufficient capital resources to us and the other participants for the drilling of the prospects;
the approval of the prospects by the other participants after additional data has been compiled;
economic and industry conditions at the time of drilling or completion, including prevailing and anticipated prices for oil and gas and the availability and prices of drilling rigs, drilling and crews;hydraulic fracturing crews and equipment, other services, supplies and equipment, and pipeline system and transportation constraints;
lease expirations;
access to water supplies or restrictions on water disposal;
regulatory approvals; and
the availability of leases and permits on reasonable terms for the prospects.
Although we have identified or budgeted for numerous drilling prospects, we may not be able to lease or drill those prospects within our expected time frame or at all. Wells that are currently part of our capital plan may be based on statistical results of drilling activities in other 3-D project areas that we believe are geologically similar rather than on analysis of seismic or other data in the prospect area, in which case actual drilling and results are likely to vary, possibly materially, from those statistical results. In addition, our drilling schedule may vary from our expectations because of future uncertainties. We may not be able to raise the capital required to drill all of our identified or budgeted wells. In addition, our ability to produce oil and gas may be significantly affected by the availability and prices of hydraulic fracturing equipment and crews. There can be no assurance that these projects can be successfully developed or that any identified drill sites or budgeted wells will, if drilled, encounter reservoirs of commercially productive oil or gas. We may seek to sell or reduce all or a portion of our interest in a project area or with respect to prospects or budgeted wells within such project area.
Our reserve data and estimated discounted future net cash flows are estimates based on assumptions that may be inaccurate and are based on existing economic and operating conditions that may change in the future.
There are uncertainties inherent in estimating oil and gas reserves and their estimated value, including many factors beyond the control of the producer. The reserve data included herein represents only estimates. Reservoir engineering is a subjective and inexact process of estimating underground accumulations of oil and gas that cannot be measured in an exact manner and is based on assumptions that may vary considerably from actual results. These include subjective estimates of underground accumulations of oil and natural gas and assumptions concerning future oil and natural gas prices, production levels, ultimate recoveries and


operating and development costs. As a result, estimated quantities of proved reserves, projections of future production rates and the timing of development expenditures may be incorrect. Furthermore, different reserve engineers may make different estimates of reserves and cash flows based on the same data. Reserve estimates may be subject to upward or downward adjustment, and actual production, revenue and expenditures with respect to our reserves likely will vary, possibly materially, from estimates. Additionally, in recent years, there has been increased debate and disagreement over the classification of reserves, with particular focus on proved undeveloped reserves. The interpretation of SEC rules regarding the classification of reserves and their applicability in different situations remain unclear in many respects. Changing interpretations of the classification standards of reserves or disagreements with our interpretations could cause us to write down reserves.
SEC rules require that, subject to limited exceptions, proved undeveloped reserves may only be booked if they relate to wells scheduled to be drilled within five years after the date of booking. This requirement may limit our ability to book additional proved undeveloped reserves as we pursue our drilling program. Moreover, we may be required to write down our proved undeveloped reserves if we do not drill those wells within the required five-year timeframe. We have deferred some of our exploration activities in response to the severe price downturn beginning in the summer of 2014 and such continued deferral may increase the impact of this requirement.
As of December 31, 2015,2018, approximately 55%60% of our proved reserves were proved undeveloped. Moreover, some of the producing wells included in our reserve reports as of December 31, 20152018 had produced for a relatively short period of time as of that date. Because most of our reserve estimates are calculated using volumetric analysis, those estimates are less reliable than estimates based on a lengthy production history. Volumetric analysis involves estimating the volume of a reservoir based on the net feet of pay of the structure and an estimation of the area covered by the structure based on seismic analysis. In addition, realization or recognition of our proved undeveloped reserves will depend on our development schedule and plans. Lack of reasonable certainty with respect to development plans for proved undeveloped reserves could cause the discontinuation of the classification of these reserves as proved.

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The discounted future net cash flows included herein are not necessarily the same as the current market value of our estimated oil and gas reserves. As required by the current requirements for oil and gas reserve estimation and disclosures, the estimated discounted future net cash flows from proved reserves are based on the average of the sales price on the first day of each month during the trailing 12-month period prior to December 31, 2015,2018, with costs determined as of the date of the estimate. As a result of significant declines inIf commodity prices such average sales prices are significantly in excess of more recent prices. Unless commodity prices or reserves increase,remain at their current levels, the estimated discounted future net cash flows from our proved reserves would generally be expected to decrease as additionalearlier months with lowerhigher commodity sales prices will be included inremoved from this calculation in the future.
In addition, lower prices have reduced and may further reduce the amount of oil and natural gas that we can produce economically, which has an may again cause us to reduce the quantities of our proved reserves and may cause the value of our estimated proved reserves at future reporting dates to decline compared to the value of our estimated proved reserves. If oil and gas prices remain at low levels, holding other factors constant, we expect that will be required to reduce our proved reserves estimates due to economic limits. Any such reduction in proved reserve volumes combined with lower commodity prices would reduce the PV-10 and standardized measure values of our proved reserves as of December 31, 2015.
Actual future net cash flows also will be affected by factors such as:
the actual prices we receive for oil and gas;
our actual operating costs in producing oil and gas;
the amount and timing of actual production;
supply and demand for oil and gas;
increases or decreases in consumption of oil and gas; and
changes in governmental regulations or taxation.
In addition, the 10% discount factor we use when calculating discounted future net cash flows for reporting requirements in compliance with the Financial Accounting Standards Board Accounting Standards Codification Topic 932, “Extractive Activities—OilActivities-Oil and Gas” may not be the most appropriate discount factor based on interest rates in effect from time to time and risks associated with us or the oil and gas industry in general.
We depend on successful exploration, development and acquisitions to maintain reserves and revenue in the future.
In general, the volume of production from oil and gas properties declines as reserves are depleted, with the rate of decline depending on reservoir characteristics. Except to the extent we conduct successful exploration and development activities or acquire properties containing proved reserves, or both, our proved reserves will decline as reserves are produced. Our future oil and gas production is, therefore, highly dependent on our level of success in developing, finding or acquiring additional reserves that are economically recoverable. There can be no assurance that undeveloped properties acquired by us will be profitably developed, that new wells drilled by us in prospects that we pursue will be productive or that we will recover all or any portion of our investment in such undeveloped properties or wells.
Our future acquisitions may yield revenues or production that varies significantly from our projections.
In acquiring producing properties, we assess the recoverable reserves, current and future oil and gas prices, development and operating costs, potential environmental and other liabilities and other factors relating to the properties. Our assessments are necessarily inexact and their accuracy is inherently uncertain. Our review of a subject property in connection with our acquisition


assessment will not reveal all existing or potential problems or permit us to become sufficiently familiar with the property to assess fully its deficiencies and capabilities. We may not inspect every well, and we may not be able to observe structural and environmental problems even when we do inspect a well. If problems are identified, the seller may be unwilling or unable to provide effective contractual protection against all or part of those problems and we may be forced to assume liabilities that we did not accurately quantify. We may increase our emphasis on producing property acquisitions. We have relatively less experience in such acquisitions as our past acquisition focus has been primarily on nonproducing acreage. Any acquisition of property interests may not be economically successful, and unsuccessful acquisitions may have a material adverse effect on our financial position and future results of operations.
Our overall level of debt and Preferred Stock obligations could adversely affect us.
As of December 31, 2018, we had a level of outstanding debt and Preferred Stock that could have significant adverse consequences on our business and future prospects, including the following:
we may not be able to obtain financing in the future on acceptable terms or at all for working capital, capital expenditures, acquisitions, debt service requirements or other purposes;
less-levered competitors could have a competitive advantage because they have lower debt service requirements;
credit rating agencies could downgrade our credit ratings below currently expected levels;
we may be less able to take advantage of significant business opportunities and to react to changes in market or industry conditions than our competitors;
we may be required to dedicate a substantial portion of our cash flows from operations to the repayment of our debt and Preferred Stock and the service of interest costs and dividends associated with our debt and Preferred Stock, rather than to productive investments; and
we may be vulnerable in the event of adverse economic or industry conditions or a downturn in our business.
A future issuance, sale or exchange of our stock or warrants could trigger a limitation on our ability to utilize net operating loss carryforwards.
Our ability to utilize U.S. net operating loss carryforwards to reduce future taxable income is subject to various limitations under the Internal Revenue Code of 1986, as amended (the “Code”). The utilization of such carryforwards may be limited under Section 382 of the Code upon the occurrence of ownership changes resulting from issuances of our stock or the sale or exchange of our stock by certain shareholders if, as a result, there is an aggregate change of more than 50% in the beneficial ownership of our stock during any three-year period. For this purpose, “stock” includes certain preferred stock and common stock warrants (including the Preferred Stock and the Warrants issued to finance in part, the ExL Acquisition). In the event of such an ownership change, Section 382 of the Code imposes an annual limitation on the amount of our taxable income that can be offset by these loss carryforwards. The limitation is generally equal to the product of (a) the fair market value of our equity multiplied by (b) a percentage approximately equivalent to the yield on long-term tax exempt bonds during the month in which an ownership change occurs. In addition, the limitation is increased if there are recognized built-in gains during any post-change year, but only to the extent of any net unrealized built-in gains inherent in the assets sold. We do not believe we have a Section 382 limitation on the ability to utilize our U.S. loss carryforwards as of December 31, 2018. However, future issuances, sales or exchanges of our stock (including, potentially, relatively small transactions and transactions beyond our control) could, taken together with prior transactions with respect to our stock, trigger an ownership change under Section 382 of the Code and therefore a limitation on our ability to utilize our U.S. loss carryforwards. Any such limitation could cause some of such loss carryforwards to expire before we would be able to utilize them to reduce taxable income in future periods, possibly resulting in a substantial income tax expense or write down of our tax assets or both.
Holders of the Preferred Stock have rights that may restrict our ability to operate our business or be adverse to holders of our common stock.
The Statement of Resolutions Establishing Series of 8.875% Redeemable Preferred Stock of Carrizo Oil & Gas, Inc. (the “Statement of Resolutions”) contains covenants that, among other things, so long as the GSO Funds (as defined below) and their affiliates beneficially own more than 50% of the outstanding Preferred Stock, limit our ability to, without the written consent of a designated representative of the Preferred Stock, but subject to certain exceptions, (i) issue stock senior to or on parity with the Preferred Stock, (ii) incur indebtedness that would cause us to exceed a specified leverage ratio, (iii) amend, modify, alter or supplement our articles of incorporation or the Statement of Resolutions in a manner that would adversely affect the rights, preferences or privileges of the Preferred Stock, (iv) enter into or amend certain debt agreements that would be more restrictive on the payment of dividends on, or redemption of, the Preferred Stock than those existing on the Preferred Stock closing and (v) pay distributions on, purchase or redeem our common stock or other stock junior to the Preferred Stock that would cause us to


exceed a specified leverage ratio. We can be required to redeem the Preferred Stock (i) after the seventh anniversary of its initial issuance or (ii) at any time we fail to pay a dividend, subject to limited cure rights.
Holders of the Preferred Stock will, in certain circumstances, have additional rights in the event we fail to timely pay dividends, fail to redeem the Preferred Stock upon a change of control if required or fail to redeem the Preferred Stock upon request of the holders of the Preferred Stock following the seventh anniversary of the date of issuing the Preferred Stock. These rights include, subject to certain exceptions, (i) that holders of a majority of the then-outstanding Preferred Stock will have the exclusive right, voting separately as a class, to appoint and elect up to two directors to our board of directors, (ii) that approval of the holders of a majority of the then-outstanding Preferred Stock will be required prior to incurring indebtedness subject to a leverage ratio, declaring or paying prohibited distributions or issuing equity of subsidiaries to third parties; and (iii) that holders of a majority of the then-outstanding Preferred Stock will have the right to increase dividend payments and the ability to require us to pay dividends in common stock.
Holders of the Preferred Stock also have limited voting rights, including those with respect to potential amendments to our articles of incorporation or the Statement of Resolutions that have an adverse effect on the existing terms of the Preferred Stock and in certain other limited circumstances or as required by law.
We participate in oil and gas leases with third parties and these third parties may not be able to fulfill their commitments to our projects.
We frequently own less than 100% of the working interest in the oil and gas leases on which we conduct operations, and other parties will own the remaining portion of the working interest. Financial risks are inherent in any operation where the cost of drilling, equipping, completing and operating wells is shared by more than one person. We could be held liable for joint activity obligations of the other working interest owners such as nonpayment of costs and liabilities arising from the actions of the other working interest owners. In addition, the sustained declines and volatility in oil and gas prices may increase the likelihood that some of these working interest owners, particularly those that are smaller and less established, are not able to fulfill their joint

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activity obligations. Some of these working interest owners have experiencedmay experience liquidity and cash flow problems. These problems may lead these parties to attempt to delay the pace of drilling or project development in order to preserve cash. A working interest owner may be unable or unwilling to pay its share of project costs. In some cases, a working interest owner may declare bankruptcy. In the event any of these third party working interest owners do not pay their share of such costs, we would likely have to pay those costs, and we may be unsuccessful in any efforts to recover these costs from such parties, which could materially adversely affect our financial position.
Certain of our undeveloped leasehold assets are subject to leases that will expire over the next several years unless production is established on units containing the acreage or we timely exercise our contractual rights to extend the terms of such leases by continuous operations or the payment of lease extension payments or delay rentals.
Leases on oil and natural gas properties typically have a primary term of three to five years, after which they expire unless, prior to expiration, a well is drilled and production of hydrocarbons in paying quantities is established, applicable lease extension payments or delay rentals are made, or such lease is otherwise maintained pursuant to any applicable continuous operations provision. If our leases on our undeveloped properties expire and we are unable to renew the leases, we will lose our right to develop the related properties. Although we seek to actively manage our undeveloped properties, our drilling plans for these areas are subject to change based upon various factors, including drilling results, oil and natural gas prices, the availability and cost of capital, drilling and production costs, availability of drilling services and equipment, gathering system and pipeline transportation constraints and regulatory approvals. If commodity prices remain low, we may be required to delay our drilling plans and, as a result, may lose our right to develop the related properties.
We have substantial capital requirements that, if not met, may hinder operations.
We have experienced and expect to continue to experience substantial capital needs as a result of our active exploration and development program and acquisitions. We expect that additional external financing will be required in the future to fund our growth. We may not be able to obtain additional financing, and financing under our existing revolving credit facility or new credit facilities may not be available in the future. Even if additional capital becomes available, it may not be on terms acceptable to us. As in the past, without additional capital resources, we may be forced to limit or defer our planned oil and gas exploration and development drilling program by releasing rigs or deferring fracturing, completion and hookup of the wells to pipelines and thereby adversely affect our production, cash flow, and the recoverability and ultimate value of our oil and gas properties, in turn negatively affecting our business, financial position and results of operations.
If our access to markets is restricted, it could negatively impact our production, our income and ultimately our ability to retain our leases. Our ability to sell oil and natural gas and receive market prices for our oil and natural gas may be adversely affected by pipeline and gathering system capacity constraints.constraints, including insufficient transportation capacity in the Delaware Basin.
Market conditions or the unavailability of satisfactory oil and gas transportation arrangements may hinder our access to oil and gas markets or delay our production. The availability of a ready market for our oil and gas production depends on a number


of factors, including the demand for and supply of oil and gas and the proximity of reserves to pipelines and terminal facilities. Our ability to market our production depends in substantial part on the availability and capacity of gathering systems, pipelines and processing facilities owned and operated by third parties. Our failure to obtain such services on acceptable terms could materially harm our business. Our productive properties may be located in areas with limited or no access to pipelines, thereby necessitating delivery by other means, such as trucking, or requiring compression facilities. However, such trucking and compression facilities may not always be available to us in acceptable terms or at all. Such restrictions on our ability to sell our oil or gas may have several adverse effects, including higher transportation costs, fewer potential purchasers (thereby potentially resulting in a lower selling price) or, in the event we were unable to market and sustain production from a particular lease for an extended time, possibly causing us to lose a lease due to lack of production. Pipeline and gathering constraints have in the past required, and may in the future require, us to flare natural gas occasionally, decreasing the volumes sold from our wells. Our lease terms may require us to pay royalties on such flared gas to maintain our leases, which could adversely affect our business.
There is currently limited pipeline and gathering system capacity in areas of the Eagle Ford and Marcellus where we operate. See “—Interruption“-Interruption to crude oil and natural gas gathering systems, pipelines and transportation and processing facilities we do not own could result in the loss of production and revenues.” This capacity shortage is particularly pronounced in the Delaware Basin and this area of operation has been characterized by periods when oil production has surpassed local transportation capacity, resulting in substantial discounts to the price received for crude oil prices quoted for WTI oil. During the year ended December 31, 2018, the Delaware Basin market crude oil price has experienced a substantial discount to WTI-Cushing prices, primarily due to limited pipeline capacity constraining transportation of crude oil out of the Delaware Basin to major marketing hubs. The amount of oil and gas being produced by us and others could continue to exceed the capacity of, and result in strains on, the various gathering and transportation systems, pipelines, processing facilities, and other infrastructure available in that area. It will be necessary for additional infrastructure, pipelines, gathering and transportation systems and processing facilities to be expanded, built, or developed to accommodate anticipated production from these areas. The expansion and construction of pipeline facilities that could alleviate transportation restrictions are affected by the availability and costs of necessary equipment, supplies, labor and other services, as well as the length of time to complete such projects. In addition, these projects can be affected by changes in international trade relationships, including the imposition of trade restrictions or tariffs relating to crude oil and natural gas and any materials or products used to expand or construct pipeline facilities, such as certain imported steel mill products that are currently subject to an additional global tariff. All of these factors could negatively impact our realized oil prices, as well as actual results of our operations.
Historically, when available we have generally delivered our oil and gas production through gathering systems and pipelines that we do not own under interruptible or short-term transportation agreements. Under the interruptible transportation agreements, the transportation of our oil and gas production may be interrupted due to capacity constraints on the applicable system, for maintenance or repair of the system, or for other reasons as dictated by the particular agreements. Due toIn the limited available pipeline capacity in the Eagle Ford and Marcellus,Delaware Basin, we have entered into firm transportation agreements for a portion of our production in such areas in order to assure our ability, and that of our purchasers, to successfully market the oil and gas that we produce. We may also enter into firm transportation arrangements for additional production in the future. These firm transportation agreements may be more costly than interruptible or short-term transportation agreements.
Production in the Marcellus and Utica by oil and gas companies expanded over the last few years and the amount of natural gas currently being produced by us and others exceeds the capacity of the various gathering and intrastate or interstate transportation pipelines currently available in these areas. It is necessary for new pipelines and gathering systems to be built. Because of the current economic climate, certain pipeline projects that are planned for the Marcellus and Utica may not occur for lack of financing. In addition, capital constraints could limit our ability to build intrastate gathering systems necessary to transport our gas to interstate pipelines. In such event, we might have to shut in our wells awaiting a pipeline connection or capacity or sell natural gas production at significantly lower prices than those we currently project, which could materially and adversely affect our results of operations.
A portion of our oil and gas production in any region may be interrupted, or shut in, from time to time for numerous reasons, including as a result of weather conditions, accidents, loss or unavailability of pipeline or gathering system access and capacity, field labor issues or strikes, or we might voluntarily curtail production in response to market conditions, including low oil and gas prices. If a substantial amount of our production is interrupted at the same time, it could temporarily adversely affect our cash flow. Furthermore, if we were required to shut in wells we might also be obligated to pay shut-in royalties to certain mineral interest owners in order to maintain our leases.

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Interruption to crude oil and natural gas gathering systems, pipelines and transportation and processing facilities we do not own could result in the loss of production and revenues.
Our operations are dependent upon the availability, proximity and capacity of pipelines, natural gas gathering systems and transportation and processing facilities we do not own. Any significant change affecting these infrastructure facilities could materially harm our business. The lack of available capacity of gathering systems, pipelines and facilities could reduce the price offered for our production or result in the shut-in of producing wells or the delay or discontinuance of development plans for properties. These systems and facilities may be temporarily unavailable due to adverse weather conditions or operational issues or may not be available to us in the future. See “—Our onshore and offshore“-Our operations are subject to various operating and other casualty risks that could result in liability exposure or the loss of production and revenues.” Additionally, activists or other efforts may delay or halt the construction of additional pipelines or facilities. To the extent these services are unavailable, we would be unable to realize revenue from wells served by such systems and facilities until suitable arrangements are made to market our production. As a result, we could experience reductions in revenue that could reduce or eliminate the funds available for our exploration and development programs and acquisitions, or result in the loss of property.


Instability in the global financial system or in the oil and gas industry sector may have impacts on our liquidity and financial condition that we currently cannot predict.
Instability in the global financial system or in the oil and gas industry sector may have a material impact on our liquidity and our financial condition. We rely upon access to both our revolving credit facility and longer-term capital markets as sources of liquidity for any capital requirements not satisfied by the cash flow from operations or other sources. Our ability to access the capital markets or borrow money may be restricted or made more expensive at a time when we would like, or need, to raise capital, which could have an adverse impact on our flexibility to react to changing economic and business conditions and on our ability to fund our operations and capital expenditures in the future. The economic situation could have an impact on our lenders or customers, causing them to fail to meet their obligations to us, and on the liquidity of our operating partners, resulting in delays in operations or their failure to make required payments. Also, market conditions, including with respect to commodity prices such as for oil and gas, could have an impact on our oil and gas derivative instruments if our counterparties are unable to perform their obligations or seek bankruptcy protection. Additionally, challenges in the economy have led and could further lead to reductions in the demand for oil and gas, or further reductions in the prices of oil and gas, or both, which could have a negative impact on our financial position, results of operations and cash flows.
The risks associated with our debt and the provisions of our debt agreements could adversely affect our business, financial position and results of operations.
We have demands on our cash resources, including interest expense, operating expenses and funding of our capital expenditures. Our level of long-term debt, the demands on our cash resources and the provisions of the credit agreement governing our revolving credit facility and the indentures governing our 7.50% Senior Notes due 2020 and our 6.25% Senior Notes due 2023 (the “6.25% Senior Notes”) and our 8.25% Senior Notes may have adverse consequences on our operations and financial results, including:
placing us at a competitive disadvantage compared to our competitors that have lower debt service obligations and significantly greater operating and financial flexibility than we do;
limiting our financial flexibility, including our ability to borrow additional funds, pay dividends, make certain investments and issue equity on favorable terms or at all;
limiting our flexibility in planning for, and reacting to, changes in business conditions;
increasing our interest expense on our variable rate borrowings if interest rates increase;
requiring us to use a substantial portion of our cash flow to make debt service payments, which will reduce the funds that would otherwise be available for operations and future business opportunities;
requiring us to modify our operations, including by curtailing portions of our drilling program, selling assets, reducing our capital expenditures, refinancing all or a portion of our existing debt or obtaining additional financing, which may be on unfavorable terms; and
making us more vulnerable to downturns in our business or the economy, including the recenta decline in oil prices.
In addition, the provisions of our revolving credit facility and our 7.50%6.25% Senior Notes and 6.25%our 8.25% Senior Notes place restrictions on us and certain of our subsidiaries with respect to incurring additional indebtedness and liens, making dividends and other payments to shareholders, repurchasing our common stock, repurchasing or redeeming our 7.50%6.25% Senior Notes and 6.25%our 8.25% Senior Notes, making investments, acquisitions, mergers and asset dispositions, entering into hedging transactions and other matters. Our revolving credit facility also requires compliance with covenants to maintain specified financial ratios. Our business plan and our compliance with these covenants are based on a number of assumptions, the most important of which is relatively

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stable oil and gas prices at economically sustainable levels. If the prices that we receive for our oil and gas production remain at their current level for an extended period of time or continue to remain at low levels or to decline, it could lead to further reduced revenues, cash flow and earnings, which in turn could lead to a default under certain financial covenants contained in our revolving credit facility, including the covenants related to working capital and the ratios described above. Also, a further decline in or sustained low oil and gas prices could result in a lowering of our credit ratings by rating agencies, which could adversely impact the pricing of, or our ability to issue, new debt instruments. Because the calculations of the financial ratios are made as of certain dates, the financial ratios can fluctuate significantly from period to period as the amounts outstanding under our revolving credit facility are dependent on the timing of cash flows related to operations, capital expenditures, sales of oil and gas properties and securities offerings. If a further decline in oil or gas prices were to occur in the future or if low prices continue for an extended period, it could further increase the risk of a lowering in our credit rating or our inability to comply with covenants to maintain specified financial ratios. Additionally, these ratios may have the effect of restricting us from borrowing the full amount available under the borrowing base for our revolving credit facility. In order to provide a margin of comfort with regard to these financial covenants, we may seek to further reduce our capital expenditure plan, sell additional non-strategic assets or opportunistically modify or increase our derivative instruments to the extent permitted under our revolving credit facility. We cannot assure you that we will be able to successfully


execute any of these strategies, or if executed, that they will be sufficient to avoid a default under our revolving credit facility if a further decline in oil or gas prices were to occur in the future or if low prices continue for an extended period.
The terms of our Preferred Stock have many of the same effects as our debt and terms of our debt agreements. See “—Our overall level of debt and Preferred Stock obligations could adversely affect us.” and “—Holders of the Preferred Stock have rights that may restrict our ability to operate our business or be adverse to holders of our common stock.”
The borrowing base under our revolving credit facility may be reduced below the amount of borrowings outstanding under such facility.
Under the terms of our revolving credit facility, our borrowing base is subject to redeterminations at least semi-annually based in part on prevailingassumptions of the administrative agent with respect to, among other things, crude oil and natural gas prices. A negative adjustment could occur if the estimates of futurecrude oil and natural gas prices used by the banks in calculating the borrowing base remainare significantly lower than those used in the last redetermination, including as a result of thea decline in crude oil prices or an expectation that such reduced prices will continue. The next redetermination of our borrowing base is scheduled to occur in Spring 2016.2019. In addition, the portion of our borrowing base made available to us is subject to the terms and covenants of our revolving credit facility, including compliance with the ratios and other financial covenants of such facility. In the event the amount outstanding under our revolving credit facility exceeds the redetermined borrowing base, we could be forced to repay a portion of our borrowings. We may not have sufficient funds to make any required repayment. If we do not have sufficient funds and are otherwise unable to negotiate renewals of our borrowings or arrange new financing, we may have to sell a portion of our assets.
We may face difficulties in securing and operating under authorizations and permits to drill, complete or operate our wells.
The recent growth in oil and gas exploration in the United States has drawn intense scrutiny from environmental and community interest groups, regulatory agencies and other governmental entities. As a result, we may face significant opposition to, or increased regulation of, our operations that may make it difficult or impossible to obtain permits and other needed authorizations to drill, complete or operate, result in operational delays, or otherwise make oil and gas exploration more costly or difficult than in other countries.
Many of our properties are in areas that may have been partially depleted or drained by our existing wells or other offset wells and certain of our wells may be adversely affected by actions other operators may take when drilling, completing, or operating wells that they own.
Many of our properties are in areas that may have already been partially depleted or drained by earlier drilling, including offset drilling by other operators. The owners of leasehold interests adjoining any of our properties could take actions, such as drilling and completing additional wells, which could inhibit our ability to find or recover commercial quantities of oil and adversely affect our operations. When a new well is completed and produced, the pressure differential in the vicinity of the well causes the migration of reservoir fluids toward the new wellbore (and potentially away from existing wellbores). As a result, the drilling and production of these potential locations could cause a depletion of our proved reserves, may result in an acceleration in the decline in production of our wells and may inhibit our ability to further develop our proved reserves. In addition, completion operations and other activities conducted on adjacent or nearby wells could cause production from our producing wells to be shut in for indefinite periods of time, could result in increased lease operating expenses and could adversely affect the production and reserves from our wells after they recommence production. We have no control over the operations or activities of offsetting operators.
We have only limited experience drilling wells in the Utica Shale and the Delaware Basin and less information regarding reserves and decline rates in these shale formations than in some other areas of our operations.
We have limited exploration and development experience in the Utica and the Delaware Basin. We have participated in the drilling of only 18117 gross (4.6(48.4 net) wellsoperated and 8 gross (3.9 net)non-operated wells in the Utica and the Delaware Basin, respectively.Basin. Other operators in these areas have significantly more experience in the drilling of wells, including the drilling of horizontal wells. As a result, we have less information with respect to the ultimate recoverable reserves, the production decline rate and other matters relating to the exploration, drilling and development of the Utica and the Delaware Basin than we have in some other areasour Eagle Ford area in which we operate.
If we are unable to acquire adequate supplies of water for our drilling operations or are unable to dispose of the water we use at a reasonable cost and within applicable environmental rules, our ability to produce oil and gas commercially and in commercial quantities could be impaired.
We use a substantial amount of water in our drilling operations.operations, including in the hydraulic fracturing process. Our inability to locate sufficient amounts of water, or to treat and dispose of water after drilling at a reasonable cost, could adversely impact our operations. Moreover, the imposition of new environmental initiatives and regulations could include restrictions on our ability to conduct certain operations such as hydraulic fracturing or disposal of waste, including, but not limited to, produced water, drilling fluids and other wastes associated with the exploration, development or production of oil and gas. Furthermore, future environmental regulations and permit requirements governing the withdrawal, storage and use of surface water or groundwater necessary for


hydraulic fracturing of wells could increase operating costs and cause delays, interruptions or termination of operations, the extent of which cannot be predicted, all of which could have an adverse effect on our operations and financial performance. For example, in April 2011, the Pennsylvania Department of Environmental

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Protection called on all Marcellus natural gas drilling operators to voluntarily cease by May 19, 2011 delivering wastewater to those centralized treatment facilities that were grandfathered from the application of PaDEP’s Total Dissolved Solids regulations. Additionally, in April 2015,June 2016, the EPA proposedestablished pretreatment standards for disposal of wastewater produced from unconventional oil and natural gas extraction facilities into publicly owned treatment works. In response to these actions, operators including us have begun to rely more on recycling of flowback and produced water from well sites as a preferred alternative to disposal.
We may not increase our acreage positions in areas with exposure to oil, condensate and natural gas liquids.NGLs.
If we are unable to increase our acreage positions in the Eagle Ford and Delaware Basin, Niobrara or Utica, this may detract from our efforts to realize our growth strategy in crude oil plays. Additionally, we may be unable to find or consummate other opportunities in these areas or in other areas with similar exposure to oil, condensate and natural gas liquidsNGLs on similar terms or at all.
Restricted land access could reduce our ability to explore for and develop oil and gas reserves.
Our ability to adequately explore for and develop oil and gas resources is affected by a number of factors related to access to land. Examples of factors which reduce our access to land include, among others:
new municipal or state land use regulations, which may restrict drilling locations or certain activities such as hydraulic fracturing;
local and municipal government control of land or zoning requirements, which can conflict with state law and deprive land owners of property development rights;
landowner or foreign governments’ opposition to infrastructure development;
regulation of federal land by the U.S. Department of the Interior Bureau of Land Management or other federal government agencies;
anti-development activities, which can reduce our access to leases through legal challenges or lawsuits, disruption of drilling, or damage to equipment;
disputes regarding leases; and
disputes with landowners, royalty owners, or other operators over such matters as title transfer, joint interest billing arrangements, revenue distribution, or production or cost sharing arrangements.
Loss of access to land for which we own mineral rights could result in a reduction in our proved reserves and a negative impact on our results of operations and cash flows. Reduced ability to obtain new leases could constrain our future growth and opportunity set by limiting the expansion of our operations.
We face strong competition from other oil and gas companies.
We encounter competition from other oil and gas companies in all areas of our operations, including the acquisition of exploratory prospects and proven properties. Our competitors include major integrated oil and gas companies and numerous independent oil and gas companies, individuals and drilling and income programs. Many of our competitors are large, well-established companies that have been engaged in the oil and gas business much longer than we have and possess substantially larger operating staffs and greater capital resources than we do. These companies may be able to pay more for exploratory projects and productive oil and gas properties and may be able to define, evaluate, bid for and purchase a greater number of properties and prospects than our financial or human resources permit. In addition, these companies may be able to expend greater resources on the existing and changing technologies that we believe are and will be increasingly important to attaining success in the industry. Such competitors may also be in a better position to secure oilfield services and equipment on a timely basis or on favorable terms. These companies may also have a greater ability to continue drilling activities during periods of low oil and gas prices, such as the current commodity price environment, and to absorb the burden of current and future governmental regulations and taxation. We may not be able to conduct our operations, evaluate and select suitable properties and consummate transactions successfully in this highly competitive environment.
We may not be able to keep pace with technological developments in our industry.
The oil and gas industry is characterized by rapid and significant technological advancements and introductions of new products and services using new technologies. As others use or develop new technologies, we may be placed at a competitive disadvantage, and competitive pressures may force us to implement those new technologies at substantial cost. In addition, other oil and gas companies may have greater financial, technical and personnel resources that allow them to enjoy technological advantages and may in the future allow them to implement new technologies before we can. We may not be able to respond to these competitive pressures and implement new technologies on a timely basis or at an acceptable cost. If one or more of the

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technologies we use now or in the future were to become obsolete or if we are unable to use the most advanced commercially available technology, our business, financial condition and results of operations could be materially adversely affected.


Part of our strategy involves drilling existing or emerging shale plays using some of the latest available seismic, horizontal drilling and completion techniques. The results of our planned exploratory and delineation drilling in these plays are subject to drilling and completion technique risks, and drilling results may not meet our expectations for reserves or production. As a result, the value of our undeveloped acreage could decline if drilling results are unsuccessful.
We rely to a significant extent on seismic data and other advanced technologies in evaluating undeveloped properties and in conducting our exploration activities. The seismic data and other technologies we use do not allow us to know conclusively, prior to drilling and completing a well, whether oil or natural gas is present or may be produced economically.
Many of our operations involve drilling and completion techniques developed by us or our service providers in order to maximize cumulative recoveries. Risks that we face while drilling include, but are not limited to, landing our well bore in the desired drilling zone, staying in the desired drilling zone while drilling horizontally through the formation, running our casing the entire length of the well bore, and being able to run tools and recover equipment consistently through the horizontal well bore. Risks that we face while completing our wells include, but are not limited to, being able to fracture stimulate the planned number of stages, being able to run tools and other equipment the entire length of the well bore during completion operations, being able to recover such tools and other equipment, and successfully cleaning out the well bore after completion of the final fracture stimulation.
Ultimately, the success of these drilling and completion techniques can only be evaluated over time as more wells are drilled and production profiles are established over a sufficiently long time period. If our drilling results are less than anticipated or we are unable to execute our drilling program because of capital constraints, lease expirations, limited access to gathering systems and takeaway capacity, commodity price decline, or other reasons, then the return on our investment for a particular project may not be as attractive as we anticipated and the value of our undeveloped acreage could decline in the future.
We are subject to various environmental risks and governmental regulations, including those relating to benzene emissions, hydraulic fracturing and global climate change, and future regulations may be more stringent resulting in increased operating costs and decreased demand for the oil and gas that we produce.
Oil and gas operations are subject to various federal, state, local and foreign laws and government regulations that may change from time to time. Matters subject to regulation include discharge permits for drilling operations, well testing, plug and abandonment requirements and bonds, reports concerning operations, the spacing of wells, unitization and pooling of properties and taxation. From time to time, regulatory agencies have imposed price controls and limitations on production by restricting the rate of flow of oil and gas wells below actual production capacity in order to conserve supplies of oil and gas. Other federal, state, local and foreign laws and regulations relating primarily to the protection of human health and the environment apply to the development, production, handling, storage, transportation and disposal of oil and gas, by-products thereof and other substances and materials produced or used in connection with oil and gas operations, including drilling fluids and wastewater. For example, in January 2016, the Pennsylvania Department of Environmental Protection announced a final-form rulemaking amending Pennsylvania Code Chapter 78 which sets new performance standards for surface activities at conventional and unconventional oil and gas well sites and announced plans to regulate methane emissions from the drilling industry by revising its permitting process for new gas wells and pipelines and proposing new requirements regulating methane from existing sources. These regulations and other future regulations could add costs and cause delays in our operations. In addition, weWe may incur costs arising out of property damage, including environmental damage caused by previous owners or operators of property we purchase or lease or relating to third party sites, or injuries to employees and other persons. As a result, we may incur substantial liabilities to third parties or governmental entities and may be required to incur substantial remediation costs. We also are subject to changing and extensive tax laws, the effects of which cannot be predicted. Compliance with existing, new or modified laws and regulations could result in substantial costs, delay our operations or otherwise have a material adverse effect on our business, financial position and results of operations.
Moreover, changes in environmental laws and regulations occur frequently and such laws and regulations tend to become more stringent over time. Increased scrutiny of our industry may also occur as a result of the EPA’s 2011-20162017-2019 National Enforcement Initiative “Assuring(“NEI”), “Ensuring Energy Extraction Activities Comply with Environmental Laws,” through which the EPA will address incidences of noncompliance from natural gas extraction and production activities that may cause or contribute to significant harm to public health or the environment. However, the EPA has proposed a 2020-2023 National Compliance Initiative (formerly referred to as an NEI) that would transition the 2017-2019 NEI to focus on significant sources of volatile organic compounds that have a substantial impact on air quality, without regard to sector. Stricter laws, regulations or enforcement policies could significantly increase our compliance costs and negatively impact our production and operations, which could have a material adverse effect on our results of operations and cash flows. See “Item 1. Business—AdditionalBusiness-Additional Oil and Gas Disclosures—Regulation—EnvironmentalDisclosures-Regulation-Environmental Regulations” for additional information.
There is increasing attention in the United States and worldwide to the issue of climate change and the contributing effect of GHG emissions. The modification of existing laws or regulations or the adoption of new laws or regulations curtailing oil and gas exploration in the areas in which we operate could materially and adversely affect our operations by limiting drilling opportunities or imposing materially increased costs. See “Item 1. Business—AdditionalBusiness-Additional Oil and Gas Disclosures—Regulation;Disclosures-Regulation- Global Climate Change” for additional information.

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Hydraulic fracturing is an important and commonly used process in the completion of oil and gas wells, particularly in unconventional resource plays. Hydraulic fracturing involves the injection of water, sand and chemicals under pressure into rock


formations to stimulate oil and gas production. The U.S. Congress has considered legislation to subject hydraulic fracturing operations to federal regulation and to require the disclosure of chemicals used by us and others in the oil and gas industry in the hydraulic fracturing process. The EPA has asserted federal regulatory authority over hydraulic fracturing involving diesel under the federal Safe Drinking Water Act and has released permitting guidance for hydraulic fracturing operations that use diesel fuel in fracturing fluids in those states where the EPA is the permitting authority. In addition, in March 2015, the BLM issued a final rule to regulate hydraulic fracturing on federal and Indian land. However, in December 2017, the BLM published a final rule rescinding the 2015 rule. The rescission rule is currently subject to legal challenge. A number of federal agencies are also analyzing, or have been requested to review, a variety of environmental issues associated with hydraulic fracturing. For example, in December 2016, the EPA is conductingreleased the final results of a comprehensive research study to investigateof the potential adverse environmental impacts of hydraulic fracturing including on water quality and public health. A draft report was released in June 2015, which concluded that hydraulic fracturing activities have not led to widespread, systemic impacts on drinking water resources in the United States, although there may be above and below ground mechanisms by whichstates where the EPA is the permitted authority. The study concluded that hydraulic fracturing activities have the potential tocan impact drinking water resources. The draft report is expected to be finalized after a public comment periodresources under some circumstances, including large volume spills and a formal review by the EPA’s Science Advisory Board.inadequate mechanical integrity of wells. These ongoing or proposed studies, depending on their course and any meaningful results obtained, could spur initiatives to further regulate hydraulic fracturing under the Safe Drinking Water Act, the Toxic Substances Control Act, or other regulatory mechanisms. President Obama has created the Interagency Working Group on Unconventional Natural Gas and Oil by Executive Order, which is charged with coordinating and aligning federal agency research and scientific studies on unconventional natural gas and oil resources.
State and federal regulatory agencies recently have focused on a possible connection between the hydraulic fracturing related activities and the increased occurrence of seismic activity. When caused by human activity, such events are called induced seismicity. In a few instances, operators of injection wells in the vicinity of seismic events have been ordered to reduce injection volumes or suspend operations. Some state regulatory agencies, including those in Colorado, Ohio, and Texas, have modified their regulations to account for induced seismicity. Regulatory agencies at all levels are continuing to study the possible linkage between oil and gas activity and induced seismicity. A 2012 report published by the National Academy of Sciences concluded that only a very small fraction of the tens of thousands of injection wells have been suspected to be, or have been, the likely cause of induced seismicity; and a 2015 report by researchers at the University of Texas has suggested that the link between seismic activity and wastewater disposal may vary by region. In 2015,March 2016, the United States Geological StudySurvey (the “USGS”) identified eight states including Colorado, Ohio, and Texas with areas of increased rates ofthe most significant hazards from induced seismicity, that could be attributedwhich included Texas. Subsequent USGS seismic hazard forecasts have continued to fluid injection or oil and gas extraction. In addition, ainclude Texas, but have found greater probability of seismic hazards in other states. A number of lawsuits have been filed most recently in Oklahoma, alleging that disposal well operations have caused damage to neighboring properties or otherwise violated state and federal rules regulating waste disposal. These developments could result in additional regulation and restrictions on the use of injection wells and hydraulic fracturing. Such regulations and restrictions could cause delays and impose additional costs and restrictions on our operations and on our and our contractors’ waste disposal activities.
Several states, including states where we operate such as Colorado, Ohio, Pennsylvania, Texas, and West Virginia, have proposed or adopted legislative or regulatory restrictions on hydraulic fracturing through additional permit requirements, public disclosure of fracturing fluid contents, water sampling requirements, and operational restrictions. Further, some states and local governments have adopted or are considering adopting bans on drilling. For example, the City of Denton, Texas adopted a moratorium on hydraulic fracturing in November 2014, which was later lifted in 2015, and New York issued a statewide ban on hydraulic fracturing in June 2015. We use hydraulic fracturing extensively and any increased federal, state, local, foreign or international regulation of hydraulic fracturing or offshore drilling, including legislation and regulation in the statesstate of Colorado, New York, Ohio, Pennsylvania, Texas, and West Virginia, could reduce the volumes of oil and gas that we can economically recover, which could materially and adversely affect our revenues and results of operations. See “Item 1. Business—AdditionalBusiness-Additional Oil and Gas Disclosures—RegulationDisclosures-Regulation-Regulation of Natural Gas and Oil Exploration and Production” and “—Environmental“-Environmental Regulations” for additional information.
From time to time legislation is introduced in the U.S. Congress that, if enacted into law, would make significant changes to United States tax laws, including the elimination of certain key U.S. federal income tax incentives currently available to oil and gas exploration and production companies. These or any other similar changes in U.S. federal income tax laws could defer or eliminate certain tax deductions that are currently available with respect to oil and gas exploration and development, and any such change could negatively affect our financial position and results of operations.
We face various risks associated with the trend toward increased anti-development activity.
As new technologies have been applied to our industry, we have seen significant growth in oil and gas supply in recent years, particularly in the U.S. With this expansion of oil and gas development activity, opposition toward oil and gas drilling and development activity has been growing both in the U.S. and globally. Companies in the oil and gas industry, such as us, can be the target of opposition to development from certain stakeholder groups. These anti-development efforts could be focused on:
limiting oil and gas development;

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reducing access to federal and state owned lands;
delaying or canceling certain projects such as shale development and pipeline construction;
limiting or banning the use of hydraulic fracturing;
denying air-quality permits for drilling; and
advocating for increased regulations on shale drilling and hydraulic fracturing.


Future anti-development efforts could result in the following:
blocked development;
denial or delay of drilling permits;
shortening of lease terms or reduction in lease size;
restrictions on installation or operation of gathering or processing facilities;
restrictions on the use of certain operating practices, such as hydraulic fracturing;
reduced access to water supplies or restrictions on water disposal;
limited access or damage to or destruction of our property;
legal challenges or lawsuits;
increased regulation of our business;
damaging publicity and reputational harm;
increased costs of doing business;
reduction in demand for our products; and
other adverse effects on our ability to develop our properties and expand production.
Our need to incur costs associated with responding to these initiatives or complying with any new legal or regulatory requirements resulting from these activities that are substantial and not adequately provided for, could have a material adverse effect on our business, financial condition and results of operations. In addition, the use of social media channels can be used to cause rapid, widespread reputational harm.
Our operations are subject to various operating and other casualty risks that could result in liability exposure or the loss of production and revenues.
The oil and gas business involves operating hazards such as:
well blowouts;
mechanical failures;
explosions;
pipe or cement failures and casing collapses, which could release oil, natural gas, drilling fluids or hydraulic fracturing fluids;
uncontrollable flows of oil, natural gas or well fluids;
fires;
geologic formations with abnormal pressures;
spillage handling and disposing of materials, including drilling fluids and hydraulic fracturing fluids and other pollutants;
pipeline ruptures or spills;
releases of toxic gases;
adverse weather conditions, including drought, flooding, winter storms, snow, hurricanes or other severe weather events; and
other environmental hazards and risks including conditions caused by previous owners and lessors of our properties.
Any of these hazards and risks can result in substantial losses to us from, among other things, injury or loss or life,

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severe damage to or destruction of property, natural resources and equipment, pollution or other environmental damage, cleanup responsibilities, regulatory investigation and penalties and suspension of operations. As a result we could incur substantial liabilities or experience reductions in revenue that could reduce or eliminate the funds available for our exploration and development programs and acquisitions.


We may not have enough insurance to cover all of the risks we face.
We maintain insurance against losses and liabilities in accordance with customary industry practices and in amounts that management believes to be prudent; however, insurance against all operational risks is not available to us. We do not carry business interruption insurance. We may elect not to carry insurance if management believes that the cost of available insurance is excessive relative to the risks presented. In addition, losses could occur for uninsured risks or in amounts in excess of existing insurance coverage. We cannot insure fully against pollution and environmental risks. We cannot assure you that we will be able to maintain adequate insurance in the future at rates we consider reasonable or that any particular types of coverage will be available. The occurrence of an event not fully covered by insurance could have a material adverse effect on our financial position and results of operations.
We conduct a substantial portion of our operations through a joint ventures,venture, which subjectsubjects us to additional risks that could have a material adverse effect on the success of these operations, our financial position and our results of operations.
We conduct a substantial portion of our operations through a joint venturesventure with third parties, including GAIL, Haimo, the OIL JV Partners and Reliance.GAIL. We may also enter into other joint venture arrangements in the future. These third parties may have obligations that are important to the success of the joint venture, such as the obligation to pay substantial carried costs pertaining to the joint venture and to pay their share of capital and other costs of the joint venture. The performance of these third party obligations, including the ability of the third parties to satisfy their obligations under these arrangements, is outside our control. If these parties do not satisfy their obligations under these arrangements, our business may be adversely affected.
Our joint venture arrangements may involve risks not otherwise present when exploring and developing properties directly, including, for example:
our joint venture partners may share certain approval rights over major decisions;
our joint venture partners may not pay their share of the joint venture’s obligations, leaving us liable for their shares of joint venture liabilities;
we may incur liabilities as a result of an action taken by our joint venture partners;
we may be required to devote significant management time to the requirements of and matters relating to the joint ventures;
our joint venture partners may be in a position to take actions contrary to our instructions or requests or contrary to our policies or objectives; and
disputes between us and our joint venture partners may result in delays, litigation or operational impasses.
The risks described above or the failure to continue our joint ventures or to resolve disagreements with our joint venture partners could adversely affect our ability to transact the business that is the subject of such joint venture, which would in turn negatively affect our financial condition and results of operations. The risks described above or the failure to continue our joint ventures or to resolve disagreements with our joint venture partners could adversely affect our ability to transact the business that is the subject of such joint venture, which would in turn negatively affect our financial condition and results of operations. The agreements under which we formed certain joint ventures may subject us to various risks, limit the actions we may take with respect to the properties subject to the joint venture and require us to grant rights to our joint venture partners that could limit our ability to benefit fully from future positive developments. Some joint ventures require us to make significant capital expenditures. If we do not timely meet our financial commitments or otherwise do not comply with our joint venture agreements, our rights to participate, exercise operator rights or otherwise influence or benefit from the joint venture may be adversely affected. Certain of our joint venture partners may have substantially greater financial resources than we have and we may not be able to secure the funding necessary to participate in operations our joint venture partners propose, thereby reducing our ability to benefit from the joint venture.

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We cannot control the activities on properties we do not operate.
We do not operate all of the properties in which we have an interest. As a result, we have limited ability to exercise influence over, and control the risks associated with, operations of these properties. The failure of an operator of our wells to adequately perform operations, an operator’s breach of the applicable agreements or an operator’s failure to act in ways that are in our best interests could reduce our production and revenues or could create liability for us for the operator’s failure to properly maintain the well and facilities and to adhere to applicable safety and environmental standards. With respect to properties that we do not operate:
the operator could refuse to initiate exploration or development projects;
if we proceed with any of those projects the operator has refused to initiate, we may not receive any funding from the operator with respect to that project;


the operator may initiate exploration or development projects on a different schedule than we would prefer;
the operator may propose greater capital expenditures than we wish, including expenditures to drill more wells or build more facilities on a project than we have funds for, which may mean that we cannot participate in those projects or participate in a substantial amount of the revenues from those projects; and
the operator may not have sufficient expertise or resources.
Any of these events could significantly and adversely affect our anticipated exploration and development activities.
Our business may suffer if we lose key personnel.
We depend to a large extent on the services of certain key management personnel, including our executive officers and other key employees, the loss of any of whom could have a material adverse effect on our operations. We have entered into employment agreements with many of our key employees as a way to assist in retaining their services and motivating their performance. We do not maintain key-man life insurance with respect to any of our employees. Our success will also be dependent on our ability to continue to employ and retain skilled technical personnel.
We may experience difficulty in achieving and managing future growth.
We have experienced growth in the past primarily through the expansion of our drilling program. Future growth may place strains on our financial, technical, operational and administrative resources and cause us to rely more on project partners and independent contractors, possibly negatively affecting our financial position and results of operations. Our ability to grow will depend on a number of factors, including:
our ability to obtain leases or options on properties, including those for which we have 3-D seismic data;
our ability to acquire additional 3-D seismic data;
our ability to identify and acquire new exploratory prospects;
our ability to develop existing prospects;
our ability to continue to retain and attract skilled personnel;
our ability to maintain or enter into new relationships with project partners and independent contractors;
the results of our drilling program;
hydrocarbon prices; and
our access to capital.
We may not be successful in upgrading our technical, operations and administrative resources or in increasing our ability to internally provide certain of the services currently provided by outside sources, and we may not be able to maintain or enter into new relationships with project partners and independent contractors. Our inability to achieve or manage growth may adversely affect our financial position and results of operations.
We may continue to enter into or exercise commodity derivative transactions to manage the price risks associated with our production, which may expose us to risk of financial loss and limit the benefit to us of increases in prices for oil and gas.
Because oil and gas prices are unstable, we periodically enter into price-risk-management transactions such as fixed-rate swaps, costless collars, three-way collars, puts, calls and basis differential swaps to reduce our exposure to price declines associated with a portion of our oil and gas production and thereby to achieve a more predictable cash flow. Additionally, some of our agreements for both the acquisition and disposition of oil and gas properties include arrangements whereby we will be required to make or entitled to receive additional payments if commodity prices exceed specified levels for certain periods of time. The use of these arrangements limits our ability to benefit from increases in the prices of oil and gas. Additionally, some derivative transactions such as certain of those entered

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into in 2015, may help to assure favorable pricing in the near term, but at the cost of limiting our ability to benefit from price increases that occur in subsequent years. At any given time our derivative arrangements may apply to only a portion of our production, including following the exercise of any then-existing derivative instruments, thereby providing only partial protection against declines in oil and gas prices. These arrangements may expose us to the risk of financial loss in certain circumstances, including instances in which production is less than expected, our customers fail to purchase contracted quantities of oil and gas or a sudden, unexpected event materially impacts oil or gas prices. In addition, the counterparties under our derivatives contracts may fail to fulfill their contractual obligations to us or there may be an adverse change in the expected differential between the underlying price in the derivative instrument and the actual prices received for our production. During periods of declining commodity prices, our commodity price derivative positions increase, which increases our counterparty exposure.


As our derivatives expire, more of our future production will be sold at market prices unless we enter into additional derivative transactions. If we are unable to enter into new derivative contracts in the future at favorable pricing and for a sufficient amount of our production, our financial condition and results of operations could be materially adversely affected. It is also possible that a larger percentage of our future production will not be hedged as our derivative policies may change, which would result in our oil and gas revenue becoming more sensitive to commodity price changes.
The CFTCCommodity Futures Trading Commission has promulgated regulations to implement statutory requirements for swap transactions. These regulations are intended to implement a regulated market in which most swaps are executed on registered exchanges or swap execution facilities and cleared through central counterparties. While we believe that our use of swap transactions exempt us from certain regulatory requirements, the changes to the swap market due to increased regulation could significantly increase the cost of entering into new swaps or maintaining existing swaps, materially alter the terms of new or existing swap transactions and/or reduce the availability of new or existing swaps. If we reduce our use of swaps as a result of the Dodd-Frank Act and regulations, our results of operations may become more volatile and our cash flows may be less predictable.
Periods of high demand for oil field services and equipment and the ability of suppliers to meet that demand may limit our ability to drill and produce our oil and gas properties.
Our industry is cyclical and, from time to time, well service providers and related equipment and personnel may be in short supply. These shortages can cause escalating prices, delays in drilling and other exploration activities and the possibility of poor services coupled with potential damage to downhole reservoirs and personnel injuries. Such pressures may increase the actual cost of services, extend the time to secure such services and add costs for damages due to any accidents sustained from the overuse of equipment and inexperienced personnel. After a period of general declines in oilfield service and equipment costs following commodity price decreases, such costs could increase as commodity prices rise and may limit our ability to drill and produce our oil and gas properties.
If crude oil and natural gas prices continuedecline to decline,near or remain atbelow the low levels experienced in 2015 and 2016 we expect tocould be required to record additional impairments of proved oil and gas properties that would constitute a charge to earnings and reduce our shareholders’ equity.
We useAt the full cost methodend of accounting for our oil and gas properties. Accordingly, we capitalize all productive and nonproductive costs directly associated with property acquisition, exploration and development activities to cost centers established on a country-by-country basis. Undereach quarter, the full cost method, the capitalized costnet book value of oil and gas properties, less accumulated amortization and related deferred income taxes, may not exceedare limited to the “cost center ceiling” which is equal to (i) the sum of (A) the present value of estimated future net revenues from proved oil and gas reserves, less estimated future expenditures to be incurred in developing and producing the proved reserves computed using a discount factor of 10%, (B) the costs of unproved properties not being amortized, and (C) the lower of cost or estimated fair value of unproved properties included in the costs being amortized; less (ii) related income tax effects. IfAny excess of the net capitalized costs exceedbook value of oil and gas properties, less related deferred income taxes, over the cost center ceiling we recognize the excessis recognized as an impairment of proved oil and gas properties. An impairment recognized in one period may not be reversed in a subsequent period even if higher commodity prices in the future result in a cost center ceiling in excess of the net book value of oil and gas prices increase the cost center ceiling applicable to the subsequent period. This evaluation is performed on a quarterly basis.properties, less related deferred income taxes.
The estimated future net revenues used in the cost center ceiling are calculated using the average realized prices for sales12-Month Average Realized Price. We recognized no impairments of oil and gas on the first calendar day of each month during the preceding 12-month period prior to the end of the current reporting period. Due primarily to declines in the average realized prices for sales of oil and gas, the capitalized costs of oil and gas properties exceeded the cost center ceiling resulting in after-tax impairments in the carrying value ofproved oil and gas properties for the years ended December 31, 2018 and December 31, 2017, but did recognize an impairment of $576.5 million for the year ended December 31, 20152016, primarily due to declines in the 12-Month Average Realized Price of $795.8 million. Based oncrude oil. Declines in the first calendar day12-Month Average Realized Price of each month,crude oil in subsequent quarters would result in a lower present value of the estimated future net revenues from proved oil and gas prices available for the 11 months ended February 1, 2016 as well as forecasted costs, we anticipate recording an additional after-tax impairmentreserves and may result in the carrying valueimpairments of proved oil and gas properties in the first quarter of 2016. Further impairments may occur if the trailing 12-month commodity prices continue to be lower than the comparable trailing 12-month commodity prices applicable to the 2015 year end.properties.
Unproved properties, not being amortized, are assessed on a quarterly basis to determine whether or not and to what extent proved reserves have been assigned to the properties or if an impairment has occurred, in which case the related costs along with associated capitalized interest are added to the oil and gas property costs subject to amortization. This assessment requires the use of judgment and estimates all of which may prove to be inaccurate. If crude oil and natural gas prices remain atdecline from their lowcurrent levels, or decline,

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we may need to write down the carrying value of our unproved oil and gas properties, which will result in increased DD&A for future periods.
ThisAn impairment does not impact cash flows from operating activities but does reduce earnings and our shareholders’ equity and increases the balance sheet leverage as measured by debt-to-total capitalization. The risk that we will be required to recognize impairments of our proved oil and gas properties increases during periods of low or declining oil or gas prices. As a result, there is an increased risk that we will incur additional impairments in 2016. In addition, impairments would occur if we were to experience sufficient downward adjustments to our estimated proved reserves or the present value of estimated future net revenues, as further discussed under “—Our“-Our reserve data and estimated discounted future net cash flows are estimates based on assumptions that may be inaccurate and are based on existing economic and operating conditions that may change in the future.” We have in the past and expectcould in the future to incur additional impairments of oil and gas properties, particularly if oil and natural gas prices decline or remain at low levels or decline.levels.
We could lose our ability to use net operating loss carryforwards that we have accumulated over the years.
Our ability to utilize U.S. net operating loss carryforwards to reduce future taxable income is subject to various limitations under the Internal Revenue Code of 1986, as amended (the “Code”). The utilization of such carryforwards may be limited upon the occurrence of certain ownership changes, including the purchase or sale of our stock by 5% shareholders and our offering of stock during any three-year period resulting in an aggregate change of more than 50% in our beneficial ownership. In the event of an ownership change, Section 382 of the Code imposes an annual limitation on the amount of our taxable income that can be offset by these carryforwards. The limitation is generally equal to the product of (a) the fair market value of our equity multiplied by (b) a percentage approximately equivalent to the yield on long-term tax exempt bonds during the month in which an ownership change occurs. In addition, the limitation is increased if there are recognized built-in gains during any post-change year, but only to the extent of any net unrealized built-in gains inherent in the assets sold. As of December 31, 2015, we believe an ownership change occurred in February 2005, which imposed an annual limitation of approximately $12.6 million of the Company’s taxable income that can be offset by the pre-change carryforwards. Subsequent equity transactions involving us or our 5% shareholders (including, potentially, relatively small transactions and transactions beyond our control) could cause further ownership changes and therefore a limitation on the annual utilization of our U.S. loss carryforwards.
A valuation allowance on a deferred tax asset could reduce our earnings.
Deferred tax assets are recorded for net operating losses and temporary differences between the book and tax basis of assets and liabilities expected to produce tax deductions in future periods. The ultimate realization of the deferred tax assets is dependent upon the generation of future taxable income during the periods in which those deferred tax assets would be deductible. We assess the realizability of the deferred tax assets each period by considering whether it is more likely than not that all or a portion of our deferred tax assets will not be realized. If we conclude that it is more likely than not that the deferred tax assets will not be realized, we record a valuation allowance against the net deferred tax asset, which has occurred in the third quarter ofsince 2015 where we recorded a valuation allowance, reducing the net deferred tax asset to zero. This valuation allowance reduces earnings and our shareholders’ equity and increases the balance sheet leverage as measured by debt-to-total capitalization. The valuation allowance remained as of December 31, 2018, and will remain until such time, if ever, that we can determine that the net deferred tax assets are more likely than not to be realized.
The taxation of independent producers is subject to change, and federal and state proposals being considered could increase our cost of doing business.
From time to time, legislative proposals are made that would, if enacted into law, make significant changes to United States tax laws, including the elimination or postponement of certain key United States federal income tax incentives currently available to independent producers of oil and natural gas. Proposals that would significantly affect us could include a repeal of the expensing of intangible drilling costs, a repeal of the percentage depletion allowance and an increase in the amortization period of geological and geophysical expenses. These changes, if enacted, will make it more costly for us to explore for and develop our oil and natural gas resources.
We may incur losses as a result of title deficiencies.
We purchase working and revenue interests in the oil and gas leasehold interests upon which we will perform our exploration activities from third parties or directly from the mineral fee owners. The existence of a material title deficiency can render a lease worthless and can adversely affect our results of operations and financial condition. Title insurance covering mineral leaseholds is not generally available and, in all instances, we forego the expense of retaining lawyers to examine the title to the mineral interest to be placed under lease or already placed under lease until the drilling block is assembled and ready to be drilled. Even then, the cost of performing detailed title work can be expensive. We may choose to forgo detailed title examination by title lawyers on a portion of the mineral leases that we place in a drilling unit or conduct less title work than we have traditionally performed. As is customary in our industry, we generally rely upon the judgment of oil and gas lease brokers or independent landmen who perform the field work in examining records in the appropriate governmental offices and abstract facilities before attempting to acquire or place under lease a specific mineral interest and before drilling a well on a leased tract. We, in some cases, perform curative work to correct deficiencies in the marketability or adequacy of the title to us. The work might include obtaining affidavits of heirship or causing an estate to be administered. In cases involving more serious title problems, the amount paid for affected oil and gas leases can be generally lost and the target area can become undrillable. The failure of title may not be discovered until after a well is drilled, in which case we may lose the lease and the right to produce all or a portion of the minerals under the property.
The threat and impact of terrorist attacks, cyber attacks or similar hostilities may adversely impact our operations.
We face various security threats to the safety of our employees; threats to the security of our infrastructure or third party facilities and infrastructure, such as processing plants and pipelines; and threats from terrorist acts and acts of war. We also face cyber security and other threats including attempts by third parties to gain unauthorized access to sensitive information or to render data or systems unusable; threats to the safety of our employees; threats to the security of our infrastructure or third party

38



facilities and infrastructure, such as processing plants and pipelines; and threats from terrorist acts and acts of war.unusable. These threats relate both to information relating to us and to third parties with whom we do business including landowners, employees, suppliers, customers and others. There can be no assurance that the procedures and controls we use to monitor these threats and mitigate our exposure to them will be sufficient in preventing them from materializing. If any of these events were to materialize, they could lead to losses of sensitive information, critical infrastructure, personnel or capabilities essential to our operations and could have a material adverse effect on our reputation, financial condition, results of operations, or cash flows.
In particular, the oil and gas industry has become increasingly dependent on digital technologies to conduct day-to-day operations including certain exploration, development and production activities. For example, software programs are used to interpret seismic data, manage drilling activities, conduct reservoir modeling and reserves estimation, and to process and record financial and operating data. We dependrely extensively on digital technology, including information technology systems and related infrastructure as well as internet sites, computer software, data hosting facilities, cloud application and services and other hardware and platforms, some of which are hosted by third parties to store, transmit, process and record sensitive information (including trade secrets, employee information and financial and operating data), communicate with our employees and business partners,associates, analyze seismic and drilling information, estimate quantities of oil and gas reserves and for many other activities related to our business. The complexity of the technologies needed to explore for and develop oil naturaland gas and NGLs makes certain information moreparticularly attractive to thieves.


Our business partners,associates, including vendors, service providers, operating partners, purchasers of our production, and financial institutions, are also dependent on digital technology. Some of these business partnerstechnology and some may be provided limited access to our sensitive information or our information systems and related infrastructure in the ordinary course of business.
As dependence on digital technologies has increased so has the risk of cyber incidents, including deliberate attacks and unintentional events. Cybersecurity threat actors are becoming more sophisticated and coordinated in their attempts to access other parties’ information technology systems and data, including those of cloud providers and third parties with which such other parties conduct business. Our technologies, systems and networks, and those of others with whom we do business, may become the target of cyber-attacks or information security breaches that could result in the unauthorized release, gathering, monitoring, misuse, loss or destruction of proprietary and other information, theft of property or other disruption of our business operations. These may result from among other things, unauthorized access, denial-of-service attacks, malicious software, data privacy and other breaches by employees, or others with authorized access, cyber or phishing-attacks, ransomware, malware, social engineering, physical breaches or other actions. A cyber incident involving our information systems and related infrastructure, or that of our business associates, could disrupt our business plans and negatively impact our operations in a variety of ways, including, but no limited to, the following:
Unauthorized access to seismic data, reserves information and other operational incidents, or other sensitive or proprietary information could have a negative impact on our ability to compete for oil and natural gas resources;
Data corruption, or other operational disruption during drilling or completion activities could result in failure to reach the intended target or a drilling or other operational incident, personal injury, damage to equipment or the subsurface or otherwise adversely affect our operations;
Data corruption or operational disruptions of production-related infrastructure could result in a loss of production, accidental discharge, and other operational incidents;
A cyber attack on, or other disruptions to a vendor or service provider or other third party could result in disruptions which could delay or halt our operations;
A cyber attack on third-party gathering, pipeline, or other transportation systems could delay or prevent us from transporting and marketing our production;
A cyber attack on our automated and surveillance systems could cause a loss in production, potential environmental hazards and other operational problems; and
A corruption or loss of our financial or operating data could result in events of non-compliance which could then lead to regulatory fines or penalties.
In addition, certain cyber incidents, such as surveillance, may remain undetected for an extended period. A cyber incident involving our information systems and related infrastructure, or that of our business partners, could disrupt our business plans and negatively impact our operations. We may be the target of such attacks and, as cyber threats continue to evolve, we may be required to expend significant additional resources to continue to modify or enhance our protective measures or to investigate and remediate any security vulnerabilities. Additionally, the growth of cyber attacks has resulted in evolving legal and compliance matters which impose significant costs that are likely to increase over time.
We cannot assess the extent of either the threat or the potential impact of future terrorist or cyber security attacks on the energy industry in general, and on us in particular, either in the short-term or in the long-term. Uncertainty surrounding such attacks may affect our operations in unpredictable ways.
Certain anti-takeover provisions may affect your rights as a shareholder.
Our articles of incorporation authorize our board of directors to set the terms of and issue preferred stock without shareholder approval. Our board of directors could use the preferred stock as a means to delay, defer or prevent a takeover attempt that a shareholder might consider to be in our best interest. In addition, our revolving credit facility, our indentures governing our senior notes and our existing Preferred Stock contain terms that may restrict our ability to enter into change of control transactions, including requirements to repay borrowings under our revolving credit facility and to offer to repurchase senior notes or to redeem our Preferred Stock, in either event upon a change in control, as determined under the relevant documents relating to such indebtedness or Preferred Stock. Furthermore, provisions in our bylaws, among other things, impose requirements on shareholders who wish to make nominations for the election of directors, propose other actions at shareholder meetings or take action to call shareholder meetings. These provisions, along with specified provisions of the Texas Business Organizations Code and our articles of incorporation and bylaws, may discourage or impede transactions involving actual or potential changes in our control, including transactions that otherwise could involve payment of a premium over prevailing market prices to holders of our common stock.
Failure to adequately protect critical data and technology systems and the impact of data privacy regulation could materially affect our operations.us.
Information technology solution failures, network disruptions and breaches of data security could disrupt our operations by causing delays or cancellation of customer orders,canceling or impeding processing of transactions and reporting financial results, resulting in the unintentional


disclosure of customer, employee, royalty owner, or other third party or our information, or damage to our reputation. There can be no assurance that a system failure or data security breach will not have a material adverse effect on our operations, financial condition, results of operations or cash flows. In addition, new laws and regulations governing data privacy and the unauthorized disclosure of confidential information, including the European Union General Data Protection Regulation and recent California legislation, pose increasingly complex compliance challenges and potentially elevate costs, and any failure to comply with these laws and regulations could result in significant penalties and legal liability.
Item 1B. Unresolved Staff Comments
None.
Item 2. Properties
Information regarding our properties is included in “Item 1. Business” above and in “Note 4. Acquisition3. Acquisitions and Divestiture”Divestitures of Oil and Gas Properties” and “Note 5.4. Property and Equipment, Net” of the Notes to our Consolidated Financial Statements included in “Item 8. Financial Statements and Supplementary Data,” which information is incorporated herein by reference.
Item 3. Legal Proceedings
From time to time, we are party to certain legal actions and claims arising in the ordinary course of business. While the outcome of these events cannot be predicted with certainty, management does not currently expect these matters to have a materially adverse effect on our financial position or results of operations.
Barrow-Shaver Litigation
On September 24, 2014 an unfavorable jury verdict was delivered against the Company in a case entitled Barrow-Shaver Resources Company v. Carrizo Oil & Gas, Inc. in the amount of $27.7 million. On January 5, 2015, the court entered a judgment awarding the verdict amount plus $2.9 million in attorneyattorneys’ fees plus pre-judgment interest. The Company strongly disagrees with the verdict and believes that the plaintiffs’ claims are without merit. Based on the Company’s position that the plaintiff's claims are without merit, we presently believe that the likelihood of material loss is remote. On December 22, 2015, the Company filed

39



its opening brief on the merits in its appeal toJanuary 31, 2017, the Twelfth Court of Appeals at Tyler, Texas. If necessary,Texas reversed the trial court decision and rendered judgment in favor of the Company, intends to appeal todeclaring that the plaintiff take nothing on any of its claims. The plaintiff petitioned the Texas Supreme Court.Court for review, which was granted, and oral arguments were held on December 4, 2018. The payment of damages per the original judgment has beenwas superseded by posting a bond in the amount of $25.0 million, which will remain outstanding pending resolution of the appeals process (which could take an extended period of time). or agreement of the parties.
The case was filed September 19, 2012 in the 7th Judicial District Court of Smith County, Texas and arises from an agreement between the plaintiff and the Company whereby the plaintiff could earn an assignment of certain of the Company’s leasehold interests in Archer and Baylor counties, Texas for each commercially productive oil and gas well drilled by the plaintiff on acreage covered by the agreement. The agreement contained a provision that the plaintiff had to obtain the Company’s written consent to any assignment of rights provided by such agreement. The plaintiff subsequently entered into a purchase and sale agreement with a third-party purchaser allowing the third-party purchaser to purchase rights in approximately 62,000 leasehold acres, including the rights under the agreement with the Company, for approximately $27.7 million. The plaintiff requested the Company’s consent to make the assignment to the third-party purchaser and the Company refused. The plaintiff alleged that, as a result of the Company’s refusal, the third-party purchaser terminated such purchase and sale agreement. The plaintiff sought damages for breach of contract, tortious interference with existing contract and other grounds in an amount not to exceed $35.0 million plus exemplary damages and attorney’sattorneys’ fees. As mentioned previously, the Twelfth Court of Appeals at Tyler, Texas found in favor of the Company on all grounds.
Item 4. Mine Safety Disclosures
Not applicable.
PART II
Item 5. Market for Registrant’s Common Equity, Related Shareholder Matters and Issuer Purchases of Equity Securities
Market Information.Our common stock, par value $0.01 per share, trades on the NASDAQ Global Select Market under the symbol “CRZO.” The following table sets forth the high and low sales prices per share of our common stock on the NASDAQ Global Select Market for the periods indicated.
  High Low
2015    
First Quarter 
$53.65
 
$38.44
Second Quarter 56.77
 48.51
Third Quarter 49.28
 27.79
Fourth Quarter 43.97
 28.16
2014    
First Quarter 
$54.94
 
$39.78
Second Quarter 69.39
 50.29
Third Quarter 70.49
 53.05
Fourth Quarter 54.92
 31.70
The closing market price of our common stock on February 19, 2016 was $21.48 per share. As of February 19, 2016,22, 2019, there were an estimated 11749 owners of record of our common stock. See “Note 10. Shareholders’ Equity” of the Notes to our Consolidated Financial Statements for further discussion.
Common Stock Dividends.We have not paid any dividends on our common stock in the past and do not intend to pay such dividends in the foreseeable future. We currently intend to retain any earnings for the future operation and development of our business, including exploration, development and acquisition activities. Our revolving credit facility, and our senior notes and the terms of our preferred stock restrict our ability to pay dividends. See “Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations—Liquidity and Capital Resources.”


Purchases of Equity Securities by the Issuer and Affiliated Purchasers. For the year ended December 31, 2018, there were no purchases made by the Company or affiliated purchasers (as defined in Rule 10b-18(a)(3) under the Securities Exchange Act of 1934), of shares of the Company’s common stock.
Common Stock Total Return Performance Graph. The following performance graph contained in this section is not deemed to be “soliciting material” or to be “filed” with the SEC, and will not be incorporated by reference into any other filings under the Securities Act of 1933, as amended (the “Securities Act”) or Securities Exchange Act of 1934, except to the extent that the Company specifically incorporates it by reference into such filing. Shareholders are cautioned against drawing any conclusions from the data contained therein, as past results are not necessarily indicative of future financial performance.
The performance graph below presents a comparison of the yearly percentage change in the cumulative total return on our common stock over the period from December 31, 20102013 to December 31, 20152018, with the cumulative total return of the S&P 500 Index and the Dow Jones U.S. Exploration & Production Index, over the same period.

40



The graph assumes an investment of $100 (with reinvestment of all dividends) was invested on December 31, 2010,2013, in our common stock at the closing market price at the beginning of this period and in each of the other two indexes.
chart-30f2354aba34596091f.jpg
  CRZO S&P 500 DJ U.S. E&P
December 31, 2010 $100 $100 $100
December 31, 2011 $76 $102 $95
December 31, 2012 $61 $118 $99
December 31, 2013 $130 $157 $131
December 31, 2014 $121 $178 $117
December 31, 2015 $86 $181 $89
We did not repurchase any of our common stock in 2015.
On November 24, 2009, we entered into an agreement with an unrelated third party and its affiliate, under which we issued 118,200 warrants to purchase shares of the Company’s common stock. In May 2015, the holders of the warrants exercised all warrants outstanding on a “cashless” basis at an exercise price of $22.09, resulting in the issuance on May 4, 2015 of 71,913 net shares of the Company’s common stock. Such shares of common stock were issued pursuant to an exemption from registration under §3(a)(9) of the Securities Act of 1933, as amended.
  CRZO S&P 500 DJ U.S. E&P
December 31, 2013 $100 $100 $100
December 31, 2014 $93 $114 $89
December 31, 2015 $66 $115 $68
December 31, 2016 $83 $129 $85
December 31, 2017 $48 $157 $86
December 31, 2018 $25 $150 $71
See “Item 12. Security Ownership of Certain Beneficial Owners and Management and Related StockholderShareholder Matters” for information regarding shares of common stock authorized for issuance under our stock incentive plans.


41




Item 6. Selected Financial Data
Our financial information set forth below for each of the five years in the period ended December 31, 2015,2018, has been derived from continuing operations information included in our audited consolidated financial statements. This information should be read in conjunction with “Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations” and our Consolidated Financial Statements and related Notes included in “Item 8. Financial Statements and Supplementary Data.”
 
Year Ended December 31,
 
2015 2014 2013 2012 2011
 
(In thousands, except per share data)
Statements of Operations from Continuing Operations Data:









Total revenues

$429,203


$710,187


$520,182


$368,180


$202,167
Costs and expenses
         
Oil and gas operating
116,990

112,151

75,340

54,826

37,636
Depreciation, depletion and amortization
300,035

317,383

214,291

165,993

84,841
General and administrative
67,224

77,029

77,492

48,708

41,539
(Gain) loss on derivatives, net (99,261) (201,907) 18,417
 (31,371) (48,423)
Interest expense, net 69,195
 53,171
 54,689
 48,158
 27,629
Impairment of oil and gas properties 1,224,367
 
 
 
 
Loss on extinguishment of debt 38,137
 
 
 
 897
Loss on sale of oil and gas properties 
 
 45,377
 
 
Other (income) expense, net 11,276
 2,150
 (185) (267) (97)
Total costs and expenses
1,727,963
 359,977
 485,421
 286,047
 144,022
Income (Loss) From Continuing Operations Before Income Taxes
(1,298,760)
350,210

34,761

82,133

58,145
Income tax (expense) benefit
140,875

(127,927)
(12,903)
(30,956)
(25,611)
Income (Loss) From Continuing Operations

($1,157,885)

$222,283


$21,858


$51,177


$32,534
Basic income (loss) from continuing operations per common share

($22.50)

$4.90


$0.54


$1.29


$0.83
Diluted income (loss) from continuing operations per common share

($22.50)

$4.81


$0.53


$1.28


$0.82
Basic weighted average common shares outstanding
51,457

45,372

40,781

39,591

39,077
Diluted weighted average common shares outstanding
51,457

46,194

41,355

40,026

39,668
Statements of Cash Flows from Continuing Operations Data:









Net cash provided by operating activities from continuing operations

$378,735


$502,275
 
$367,474


$253,071


$155,511
Net cash used in investing activities from continuing operations
(673,376)
(940,676) (509,885)
(465,151)
(250,068)
Net cash provided by financing activities from continuing operations
330,767

300,290
 120,326

237,778

116,826
Other Cash Flows from Continuing Operations Data:









Capital expenditures - oil and gas properties

($674,612)

($860,604)

($786,976)

($735,711)

($516,004)
Proceeds from sales of oil and gas properties, net 8,047
 12,576
 238,470
 341,597
 167,265
Proceeds from issuances of senior notes 650,000
 301,500
 
 300,000
 197,000
Tender and redemption of senior notes and other payments of long-term debt (776,681) 
 (69,325) (55,228) (70,599)
Sale of common stock, net of offering costs
470,158



189,686




Balance Sheets from Continuing Operations Data:









Working capital

($50,636)

($141,278)

($32,138)

($43,432)

($150,559)
Total property and equipment, net
1,716,861

2,629,253

1,794,215

1,487,674

1,240,917
Total assets
2,026,905

2,981,476

2,110,760

1,749,488

1,445,075
Long-term debt
1,255,676

1,351,346

900,247

967,808

711,486
Total shareholders’ equity
444,054

1,103,441

841,604

585,016

509,855
 
Years Ended December 31,
 
2018 2017 2016 2015 2014
 
(In thousands, except per share amounts)
Statements of Operations Information:









Total revenues

$1,065,942


$745,888
 
$443,594


$429,203


$710,187
Total costs and expenses
656,342
 654,748
 1,119,068
 1,727,963
 359,977
Income (loss) from continuing operations
404,427
 87,110
 (675,474) (1,157,885) 222,283
Net income (loss) attributable to common shareholders 376,076
 78,467
 (675,474) (1,155,154) 226,343
Income (loss) from continuing operations per
common share:
          
Basic

$4.73


$1.19


($11.27)

($22.50)

$4.90
Diluted

$4.64


$1.18


($11.27)

($22.50)

$4.81
Net income (loss) attributable to common shareholders per common share:          
Basic 
$4.40
 
$1.07
 
($11.27) 
($22.45) 
$4.99
Diluted 
$4.32
 
$1.06
 
($11.27) 
($22.45) 
$4.90
Weighted average common shares outstanding:          
Basic
85,509

73,421
 59,932

51,457

45,372
Diluted
87,143

73,993
 59,932

51,457

46,194
           
Statements of Cash Flows Information:
         
Net cash provided by operating activities from continuing operations

$653,555
 
$422,981
 
$272,768


$378,735


$502,275
Net cash used in investing activities from
continuing operations

(795,968) (1,159,452) (619,832)
(673,376)
(940,676)
Net cash provided by financing activities from continuing operations
135,155
 741,817
 308,340

330,767

300,290
           
Balance Sheet Information:
         
Total assets
3,185,100

2,778,304

1,626,327

2,007,246

2,962,305
Long-term debt
1,633,591

1,629,209

1,325,418

1,236,017

1,332,175
Preferred stock 174,422
 214,262
 
 
 
Total shareholders’ equity
980,904

370,897

23,458

444,054

1,103,441


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Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations
The following discussion and analysis of our financial condition and results of operations should be read in conjunction with our Consolidated Financial Statements and related Notes included in “Item 8. Financial Statements and Supplementary Data.” The following discussion and analysis contains statements, including, but not limited to, statements relating to our plans, strategies, objectives, and expectations. Please see “Forward-Looking Statements” and “Item 1A. Risk Factors” for further details about these statements.
General Overview
Production, Commodity Prices and Revenue. Total production forSignificant Developments in 2018
In the year ended December 31, 2015 increased 12% from 2014 to a record 36,719 Boe/d,first quarter of which 72% was2018, we closed on divestitures of substantially all of our assets in the Eagle Ford. Crude oil production for 2015 wasNiobrara Formation and a record 23,054 Bbls/d, an increaseportion of 22% from 2014, primarily driven by strong performance from our wellsassets in the Eagle Ford which averaged 20,182 Bbls/d for 2015. Driven primarily by the 49% decrease in average realizedaggregate net proceeds of approximately $381.3 million. In addition, we could receive contingent consideration of $5.0 million per year if crude oil prices our 2015 revenues decreased to $429.2 million. For further discussionexceed specified thresholds for each of production, commodity prices and revenue, see “—Resultsthe years of Operations” below.2018 through 2020 as part of the Niobrara divestiture.
Operational Highlights. SeeIn the table below for detailsfirst quarter of 2018, we redeemed 50,000 shares of our operated drilling8.875% redeemable preferred stock (the “Preferred Stock”), representing 20% of the then issued and completion activity by region:outstanding Preferred Stock, for $50.5 million.
  Year Ended December 31, 2015 As of December 31, 2015
  Drilled 
Wells Brought
on Production
 Waiting on Completion Producing Rig Count
Region Gross Net Gross Net Gross Net Gross Net 
Eagle Ford 71
 65.1
 67
 60.1
 29
 27.3
 263
 230.8
 2
Niobrara 13
 7.5
 11
 5.8
 9
 5.2
 123
 53.4
 
Marcellus 
 
 
 
 11
 4.3
 82
 26.3
 
Utica 
 
 2
 1.7
 
 
 4
 3.1
 
Delaware Basin 4
 3.6
 2
 1.7
 2
 1.9
 2
 1.7
 1
Total 88
 76.2
 82
 69.3
 51
 38.7
 474
 315.3
 3
Approximately 80%On July 11, 2018, we closed on the divestiture of our 2015 drilling and completion capital expenditures were in the Eagle Ford where, as of December 31, 2015, we were operating two rigs. We began drillingcertain non-operated assets in the Delaware Basin in 2015 and completed 2 gross (1.7 net) wells. Asfor aggregate net proceeds of December 31, 2015, we held an interest in 21,915 net acres in the Delaware Basin and we are continuing to pursue additional acreage in the oil and condensate windows of the Wolfcamp Formation.$30.9 million.
At December 31, 2015, our estimated net proved oil and natural gas reserves were 170.6 MMBoe, an increase of 19.6 million MMBoe, or 13%, from December 31, 2014. Approximately 64% of our total estimated net proved reserves are crude oil. Our reserves increased primarily as a result of our ongoing drilling program in the Eagle Ford. See “Item 1. Business—Proved Oil and Gas Reserves” for additional discussion.
Financing Activities. In March 2015,On August 17, 2018, we completed a public offering of 5.29.5 million shares of our common stock at a price of $44.75 per share forof $22.55. We used the proceeds of $231.3$213.7 million, net of offering costs. We used the net proceeds from the common stock offering to repay a portion of the borrowings under our revolving credit facility and for general corporate purposes.
In April 2015, we settled a cash tender offer for any or all of the outstanding $600.0 million aggregate principal amount of our 8.625% Senior Notes. In connection with the cash tender offer, we also redeemed in May 2015 all of the 8.625% Senior Notes that remained outstanding following the cash tender offer. See “—Financing Arrangements—8.625% Senior Notes” for details of the tender offer and redemption of our 8.625% Senior Notes.
Also in April 2015, we closed a public offering of $650.0 million aggregate principal amount of 6.25% Senior Notes due 2023. The 6.25% Senior Notes bear interest at 6.25% per annum which is payable semi-annually on each April 15 and October 15 and mature on April 15, 2023. The proceeds of $640.3 million, net of underwriting discounts and commissions, were usedcosts, to fund the repurchase of the 8.625% Senior Notes in the tender offer described above, redeem the remaining outstanding 8.625% Senior Notes, and repay borrowings outstanding under our revolving credit facility.
In May 2015, we entered into the sixth amendment to the credit agreement governing the revolving credit facility to, among other things, (i) establish an approved borrowing base of $685.0 million until the next redetermination, (ii) establish a swing line commitment under our revolving credit facility not to exceed $15.0 million and (iii) include seven additional banks to our banking syndicate, bringing the total number of banks to 19 as of the date of such amendment.
In October 2015, we completed a public offering of 6.3 million shares of our common stock at a price of $37.80 per share, for net proceeds of $238.8 million, net of offering costs. We used the net proceeds from the common stock offering to repay borrowings under our revolving credit facilityDevon Acquisition (described below) and for general corporate purposes.
InOn October 2015,17, 2018, we entered intoclosed on the seventh amendmentacquisition of oil and gas properties with Devon Energy Production Company, L.P. (“Devon”), a subsidiary of Devon Energy Corporation (the “Devon Acquisition”). The estimated aggregate net consideration of $196.6 million remains subject to the credit agreement governing the revolving credit facility to, among other things, (i) reaffirm thepost-closing adjustments.
During 2018, our borrowing base at its current levelincreased from $830.0 million to $1.3 billion, with an elected commitment amount of $685.0$1.1 billion.
In 2018, we fully redeemed the remaining $450.0 million until the next redeterminationaggregate principal amount outstanding of our 7.50% Senior Notes due 2020 (the “7.50% Senior Notes”).
Our 2018 drilling, completion, and (ii) amend the financial covenant requiring the maintenanceinfrastructure (“DC&I”) capital expenditures were $844.4 million, of a ratio of Total Debt to EBITDA (as definedwhich 62% was in the credit agreement)Eagle Ford with the remaining 38% in the Delaware Basin. The midpoint of not more than 4.00 to 1.00, such that the permissible ratio is increased to 4.75 to 1.00 through December 31, 2016, reducing to 4.375 to 1.00 through December 31, 2017, and returning to 4.00 to 1.00 thereafter. As of December 31, 2015, we had no borrowings outstanding under our revolving credit facility.

43



2016 Capital Expenditure Plan. Our current 20162019 DC&I capital expenditure plan includes $270.0of $550.0 million to $290.0 million for drilling and completion and $15.0 million for leasehold and seismic, which represents a substantial decrease fromis approximately 35% lower than our 20152018 actual DC&I capital expenditures of $544.2 million and is in response to the continued lower crude oil prices that the industry has experienced throughout 2015 and into 2016. Approximately 93% of our 2016 drilling and completion capital expenditure plan is allocated to our continued exploration and development of the Eagle Ford.expenditures. See “—Liquidity and Capital Resources—20162019 DC&I Capital Expenditure Plan and Funding Strategy” for additional details.
Recent Developments
For the year ended December 31, 2018, the specified pricing thresholds related to the Contingent ExL Consideration, the Contingent Niobrara Consideration, and the Contingent Utica Consideration were exceeded. As a result, in January 2019, we paid $50.0 million and received $10.0 million from settlement of these contingent consideration arrangements.


Results of Operations
YearComparison of Results Between Years Ended December 31, 2015 Compared to the Year2018 and 2017 and Between Years Ended December 31, 20142017 and 2016
Production volumes
The following table summarizes total production volumes and daily production volumes average realized prices and revenues for the years ended December 31, 2015 and 2014:periods indicated:
  
Year Ended
December 31,
 
2015 Period
Compared to 2014 Period
  2015 2014 Increase(Decrease) % Increase(Decrease)
Total production volumes -        
Crude oil (MBbls) 8,415
 6,906
 1,509
 22%
NGLs (MBbls) 1,352
 926
 426
 46%
Natural gas (MMcf) 21,812
 24,877
 (3,065) (12%)
Total barrels of oil equivalent (MBoe) 13,402
 11,978
 1,424
 12%
         
Daily production volumes by product -        
Crude oil (Bbls/d) 23,054
 18,921
 4,133
 22%
NGLs (Bbls/d) 3,705
 2,537
 1,168
 46%
Natural gas (Mcf/d) 59,758
 68,156
 (8,398) (12%)
Total barrels of oil equivalent (Boe/d) 36,719
 32,816
 3,903
 12%
         
Daily production volumes by region (Boe/d) -        
Eagle Ford 26,377
 21,131
 5,246
 25%
Niobrara 2,957
 2,585
 372
 14%
Marcellus 5,850
 8,354
 (2,504) (30%)
Utica 1,286
 288
 998
 347%
Delaware Basin and other 249
 458
 (209) (46%)
Total barrels of oil equivalent (Boe/d) 36,719
 32,816
 3,903
 12%
         
Average realized prices -        
Crude oil ($ per Bbl) 
$44.69
 
$88.40
 
($43.71) (49%)
NGLs ($ per Bbl) 11.54
 27.05
 (15.51) (57%)
Natural gas ($ per Mcf) 1.72
 3.00
 (1.28) (43%)
Total average realized price ($ per Boe) 
$32.03
 
$59.29
 
($27.26) (46%)
         
Revenues (In thousands) -        
Crude oil 
$376,094
 
$610,483
 
($234,389) (38%)
NGLs 15,608
 25,050
 (9,442) (38%)
Natural gas 37,501
 74,654
 (37,153) (50%)
Total revenues 
$429,203
 
$710,187
 
($280,984) (40%)
  Years Ended December 31, Amount Change Between Percent Change Between
  2018 2017 2016 2018/2017 2017/2016 2018/2017 2017/2016
Total production volumes              
Crude oil (MBbls) 14,232
 12,566
 9,423
 1,666
 3,143
 13% 33%
NGLs (MBbls) 3,701
 2,327
 1,788
 1,374
 539
 59% 30%
Natural gas (MMcf) 24,639
 28,472
 25,574
 (3,833) 2,898
 (13%) 11%
Total barrels of oil equivalent (MBoe) 22,040
 19,639
 15,473
 2,401
 4,166
 12% 27%
               
Daily production volumes by product              
Crude oil (Bbls/d) 38,992
 34,428
 25,745
 4,564
 8,683
 13% 34%
NGLs (Bbls/d) 10,139
 6,376
 4,885
 3,763
 1,491
 59% 31%
Natural gas (Mcf/d) 67,503
 78,006
 69,873
 (10,503) 8,133
 (13%) 12%
Total barrels of oil equivalent (Boe/d) 60,382
 53,805
 42,276
 6,577
 11,529
 12% 27%
               
Daily production volumes by region (Boe/d)              
Eagle Ford 37,591
 37,825
 30,664
 (234) 7,161
 (1%) 23%
Delaware Basin 22,609
 6,713
 1,115
 15,896
 5,598
 237% 502%
Other 182
 9,267
 10,497
 (9,085) (1,230) (98%) (12%)
Total barrels of oil equivalent (Boe/d) 60,382
 53,805
 42,276
 6,577
 11,529
 12% 27%
Revenues for 2015 decreased 40% to $429.2 millionThe increase in production volumes in 2018 as compared to $710.2 million in 20142017 is primarily due to production from new wells in the decreaseDelaware Basin, primarily drilled on properties from the ExL Acquisition, as well as in crude oil and natural gas prices,Eagle Ford, partially offset by the significant increasedivestitures in crude oil production. Production volumesUtica and Marcellus in 2015the fourth quarter of 2017 and 2014 were 36,719 Boe/dNiobrara and 32,816 Boe/d, respectively. Eagle Ford in the first quarter of 2018 and normal production declines.
The increase in production from 2014volumes in 2017 as compared to 2015 was2016 is primarily due to increased production from new wells in the Eagle Ford and Delaware Basin and the addition of production from our acquisition of oil and gas properties located in the Eagle Ford Shale from Sanchez Energy Corporation and SN Cotulla Assets, LLC, a subsidiary of Sanchez Energy Corporation, in the fourth quarter of 2016 (the “Sanchez Acquisition”) and the ExL Acquisition in the third quarter of 2017, partially offset by the divestitures in Utica and Marcellus in the fourth quarter of 2017 and normal production declinesdeclines.
Average realized prices and voluntary curtailments of natural gas productionrevenues
The following table summarizes average realized prices and revenues for the periods indicated:
  Years Ended December 31, Amount Change Between Percent Change Between
  2018 2017 2016 2018/2017 2017/2016 2018/2017 2017/2016
Average realized prices              
Crude oil ($ per Bbl) 
$64.05
 
$50.39
 
$40.12
 
$13.66
 
$10.27
 27% 26%
NGLs ($ per Bbl) 26.10
 20.37
 12.54
 5.73
 7.83
 28% 62%
Natural gas ($ per Mcf) 2.35
 2.29
 1.69
 0.06
 0.60
 3% 36%
Total average realized price ($ per Boe) 
$48.36
 
$37.98
 
$28.67
 
$10.38
 
$9.31
 27% 32%
               
Revenues (In thousands)              
Crude oil 
$911,554
 
$633,233
 
$378,073
 
$278,321
 
$255,160
 44% 67%
NGLs 96,585
 47,405
 22,428
 49,180
 24,977
 104% 111%
Natural gas 57,803
 65,250
 43,093
 (7,447) 22,157
 (11%) 51%
Total revenues 
$1,065,942
 
$745,888
 
$443,594
 
$320,054
 
$302,294
 43% 68%
The increase in the Marcellusrevenues in 2018 as compared to 2017 is primarily due to unfavorable natural gas prices.higher crude oil prices and production.
The increase in revenues in 2017 as compared to 2016 is also primarily due to higher crude oil prices and production.


Lease operating expensesexpense
The following table summarizes lease operating expense for 2015 increased to $90.1 million ($6.72 per Boe) from $74.2 million ($6.19 per Boe) in 2014. the periods indicated:
  Years Ended December 31,
  2018 2017 2016
  (In thousands, except per Boe amounts)
  Amount Per Boe Amount Per Boe Amount Per Boe
Lease operating expense 
$161,596
 
$7.33
 
$139,854
 
$7.12
 
$98,717
 
$6.38
The increase in lease operating expensesexpense in 2018 as compared to 2017 is primarily due to costs associated with increased production. The increase in lease operating expense per Boe between the periods is primarily due to processing fees for certain of our natural gas and NGL processing contracts that, effective January 1, 2018, are presented in lease operating expense as a result of the adoption of ASC 606 as well as an increased proportion of total production from crude oil properties, which have a higher operating cost per Boe than natural gas properties, as a result of the divestiture in Marcellus in the fourth quarter of 2017. These increases were partially offset by the increased proportion of production from properties acquired in the ExL Acquisition, which have lower operating costs per Boe than our other Delaware Basin and Eagle Ford properties.
The increase in lease operating expense in 2017 as compared to 2016 is primarily due to increased production from newand increased workover costs primarily on wells acquired in the Eagle Ford.Sanchez Acquisition. The increase

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in lease operating expense per Boe between the periods is primarily due to the workover costs described above as well as to an increased proportion of total production from crude oil properties, which have a higher operating cost per Boe than natural gas properties.
Production and ad valorem taxes
The following table summarizes production taxes decreasedand ad valorem taxes for the periods indicated:
  Years Ended December 31,
  2018 2017 2016
  (In thousands, except % of revenues amounts)
  Amount % of Revenues Amount % of Revenues Amount % of Revenues
Production taxes 
$50,591
 4.7% 
$32,509
 4.4% 
$19,046
 4.3%
Ad valorem taxes 10,422
 1.0% 7,267
 1.0% 5,559
 1.3%
The increase in production taxes in 2018 as compared to $17.7 million (or 4.1% of revenues) in 2015 from $29.5 million (or 4.2% of revenues) in 2014 as a result of2017 is primarily due to the decreaseincrease in crude oil and natural gas revenues, partially offset by increased crude oil production.NGL revenues. The decreaseincrease in production taxes as a percentage of revenues between the periods is primarily due to a benefitthe divestiture of substantially all of our assets in Marcellus in the thirdfourth quarter of 2015 of lower actual2017, as our production taxes than previously estimated in the Niobrara.
Ad valorem taxes increasedMarcellus was not subject to $9.3 million in 2015 from $8.5 million in 2014.production taxes. The increase in ad valorem taxes in 2018 as compared to 2017 is primarily due to new wells drilled in the Eagle Ford and new wells drilled or acquired in 2014,the Delaware Basin and higher property tax valuations as a result of the increase in crude oil prices, partially offset by a reduction in ad valorem taxes resulting from the divestitures discussed above.
The increase is production taxes in 2017 as compared to 2016 is primarily due to the increase in crude oil, NGL, and natural gas revenues. The increase in production taxes as a percentage of revenues between the periods is due primarily to a decreased proportion of total revenues attributable to Marcellus production, which is not subject to production taxes. The increase in ad valorem taxes in 2017 as compared to 2016 is due to new wells drilled in the Eagle Ford and Delaware Basin in 2016 and new wells acquired in the Sanchez Acquisition in December 2016. The decrease in our annual estimate of ad valorem taxes.taxes as a percentage of revenue between the periods is primarily due to the timing of when wells are included in the ad valorem tax assessment as wells drilled and producing during 2017 would not be included in the ad valorem tax assessment until 2018.


Depreciation, depletion and amortization
The following table sets forth the components of our depreciation, depletion and amortization (“DD&A”) expense for 2015 decreased $17.3 million to $300.0 million ($22.39 per Boe) from the periods indicated:
  Years Ended December 31,
  2018 2017 2016
  (In thousands, except per Boe amounts)
  Amount Per Boe Amount Per Boe Amount Per Boe
DD&A of proved oil and gas properties 
$295,044
 
$13.39
 
$257,057
 
$13.09
 
$208,849
 
$13.50
Depreciation of other property and equipment 2,522
 0.11
 2,484
 0.13
 2,613
 0.17
Amortization of other assets 598
 0.03
 1,249
 0.06
 1,136
 0.07
Accretion of asset retirement obligations 1,366
 0.06
 1,799
 0.09
 1,364
 0.09
DD&A 
$299,530
 
$13.59
 
$262,589
 
$13.37
 
$213,962
 
$13.83
DD&A expense for 2014 of $317.42018 increased $36.9 million ($26.50 per Boe).compared to 2017. The decreaseincrease in DD&A expense is attributable to increased production, as well as an increase in the DD&A rate per Boe. The increase in the DD&A rate per Boe is due primarily to an increase to proved oil and gas properties as a result of our ongoing capital expenditure program, partially offset by the reduction in proved oil and gas properties as a result of the divestitures in Niobrara and Eagle Ford in the first quarter of 2018 and an increase in proved oil and gas reserves.
DD&A expense for 2017 increased $48.6 million compared to 2016. The increase in DD&A expense is attributable to increased production, partially offset by the decrease in the DD&A rate per Boe, which is primarily due to the impairment recordedBoe. The decrease in the third quarterDD&A rate per Boe is due primarily to impairments of 2015our proved oil and gas properties recorded during 2016, reductions in estimated future development costs as a result of reduced service costs that occurred throughout 2015. The componentsin the fourth quarter of our DD&A expense were as follows:2016, and the addition of crude oil reserves in the fourth quarter of 2017, partially offset by the allocation to proved oil and gas properties related to the ExL Acquisition.
Impairment of proved oil and gas properties
Details of the 12-Month Average Realized Price of crude oil for 2018, 2017, and 2016 and impairments of proved oil and gas properties for 2016 are summarized in the table below:
  Year Ended December 31,
  2015 2014
  (In thousands)
DD&A of proved oil and gas properties 
$295,452
 
$313,799
Depreciation of other property and equipment 1,932
 1,722
Amortization of other assets 1,539
 1,152
Accretion of asset retirement obligations 1,112
 710
DD&A 
$300,035
 
$317,383
  Years Ended December 31,
  2018 2017 2016
Impairment of proved oil and gas properties (In thousands) 
$—
 
$—
 $576,540
Crude Oil 12-Month Average Realized Price ($/Bbl) - Beginning of period $49.87 $39.60 $47.24
Crude Oil 12-Month Average Realized Price ($/Bbl) - End of period $63.80 $49.87 $39.60
Crude Oil 12-Month Average Realized Price percentage increase (decrease) during period 28% 26% (16%)
We recognized an after-tax impairmentdid not recognize impairments of $795.8 million ($1,224.4 million pre-tax) in 2015proved oil and gas properties for the years ended December 31, 2018 and 2017. Primarily due primarily to declines in the average realized prices for sales12-Month Average Realized Price of crude oil, and gas on the first calendar day of each month during the trailing 12-month period prior to December 31, 2015. There were nowe recognized impairments of proved oil and gas properties in 2014.2016.
General and administrative expense, decreasednet
The following table summarizes general and administrative expense, net for the periods indicated:
  Years Ended December 31,
  2018 2017 2016
  (In thousands)
General and administrative expense, net 
$68,617
 
$66,229
 
$74,972
The increase in general and administrative expense, net in 2018 as compared to $67.2 million for 2015 from $77.0 million for 2014. 2017 is primarily due to an increase in personnel costs and higher annual bonuses awarded in the first quarter of 2018 compared to the first quarter of 2017.
The decrease wasin general and administrative expense, net in 2017 as compared to 2016 is primarily due to a decrease in stock-based compensation, costs resulting fromnet as a result of a decrease in the fair value of stock appreciation rights for 2017 due to exercises and expirations and a decrease in the numberfair value of stock appreciation rights and restrictedin 2017 as compared to an increase in the fair value of stock outstanding.appreciation rights in 2016, partially offset by higher compensation costs for 2017 as compared to 2016, resulting from an increase in personnel as well as higher annual bonuses awarded in the first quarter of 2017 compared to the first quarter of 2016.


(Gain) loss on derivatives, net
The following table sets forth the components of our (gain) loss on derivatives, net for the periods indicated:
  Years Ended December 31,
  2018 2017 2016
  (In thousands)
Crude oil derivative instruments 
($9,726) 
$22,839
 
$23,609
NGL derivative instruments 4,439
 1,322
 
Natural gas derivative instruments (421) (15,399) 19,584
Deferred premium obligations 1,875
 18,401
 5,880
Contingent consideration arrangements (2,876) 31,940
 
(Gain) loss on derivatives, net 
($6,709) 
$59,103
 
$49,073
The gain on derivatives, net for 2015 amounted to $99.3 millionin 2018 was primarily due to new crude oil hedge positions executed during 2015, the downward shift in the futures curve of forecasted commodity prices for crude oil during the first quarter of 2015 priorprices from January 1, 2018 to our lock-in of our then existingDecember 31, 2018 on crude oil derivative positions,instruments outstanding at the beginning of 2018 as well as on our Contingent ExL Consideration and the downward shift in the futures curve of forecasted commoditycrude oil prices for natural gas from January 1, 2015subsequent to December 31, 2015.contract executions of new crude oil derivative instruments. The gain on derivatives, net for 2014 amounted to $201.9 million primarily due to new hedge positions in 2014 andwas partially offset by deferred premium obligations incurred during 2018, the significanteffect of the downward shift in the futures curve of forecasted commoditycrude oil prices formentioned above on our Contingent Niobrara Consideration and Contingent Utica Consideration, and the upward shift in crude oil and natural gasNGL settlement prices during the fourth quartermajority of 2014.2018.
Interest expense, net for 2015 was $69.2 million as compared to $53.2 million for 2014. The increase was primarily due to the interest expense on the $300.0 million aggregate principal amount of our 7.50% Senior Notes that were issued in October 2014, the interest expense on the $650.0 million aggregate principal amount of our 6.25% Senior Notes that were issued in April 2015 and a decrease in the associated capitalized interest due to a lower average balance of unproved properties and a lower effective interest rate on debt outstanding during 2015 as compared to 2014, partially offset by a reduction in interest expense associated with the $600.0 million aggregate principal amount of our 8.625% Senior Notes that were redeemed and repurchased in April 2015. The components of our interest expense, net were as follows:
  Year Ended December 31,
  2015 2014
  (In thousands)
Interest expense on Senior Notes 
$90,882
 
$78,256
Interest expense on revolving credit facility 4,226
 3,265
Amortization of debt issuance costs, premiums, and discounts 4,724
 4,703
Other interest expense 1,453
 1,492
Capitalized interest (32,090) (34,545)
Interest expense, net 
$69,195
 
$53,171

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The effective income tax rate was 10.8% for 2015 and 36.5% for 2014. The variance from the U.S. Federal statutory rate of 35% for 2015 was primarily due to a valuation allowance of $323.6 million that was recorded against our net deferred tax asset during 2015. The variance from the U.S. Federal statutory rate of 35% for 2014 was due to the impact of state income taxes.
Income from discontinued operations, net of income taxes for 2015 amounted to $2.7 million. The income from discontinued operations, net of income taxes is related to the sale of Carrizo UK. The income was primarily due to decreases in estimated future obligations as a result of the continued downward shift in the futures curve of forecasted commodity prices for Brent crude oil during 2015.
Year Ended December 31, 2014 Compared to the Year Ended December 31, 2013
The following table summarizes total production volumes, daily production volumes, average realized prices and revenues for the years ended December 31, 2014 and 2013:
  Year Ended
December 31,
 
2014 Period
Compared to 2013 Period
  2014 2013 Increase(Decrease) % Increase(Decrease)
Total production volumes -        
Crude oil (MBbls) 6,906
 4,231
 2,675
 63%
NGLs (MBbls) 926
 531
 395
 74%
Natural gas (MMcf) 24,877
 31,422
 (6,545) (21%)
Total barrels of oil equivalent (MBoe) 11,978
 9,999
 1,979
 20%
         
Daily production volumes by product -        
Crude oil (Bbls/d) 18,921
 11,592
 7,329
 63%
NGLs (Bbls/d) 2,537
 1,455
 1,082
 74%
Natural gas (Mcf/d) 68,156
 86,088
 (17,932) (21%)
Total barrels of oil equivalent (Boe/d) 32,816
 27,395
 5,421
 20%
         
Daily production volumes by region (Boe/d) -        
Eagle Ford 21,131
 12,628
 8,503
 67%
Niobrara 2,585
 1,724
 861
 50%
Barnett 
 6,625
 (6,625) (100%)
Marcellus 8,354
 6,139
 2,215
 36%
Utica 288
 10
 278
 2,780%
Delaware Basin and other 458
 269
 189
 70%
Total barrels of oil equivalent (Boe/d) 32,816
 27,395
 5,421
 20%
         
Average realized prices -        
Crude oil ($ per Bbl) 
$88.40
 
$99.58
 
($11.18) (11%)
NGLs ($ per Bbl) 27.05
 29.25
 (2.20) (8%)
Natural gas ($ per Mcf) 3.00
 2.65
 0.35
 13%
Total average realized price ($ per Boe) 
$59.29
 
$52.02
 
$7.27
 14%
         
Revenues (In thousands) -        
Crude oil 
$610,483
 
$421,311
 
$189,172
 45%
NGLs 25,050
 15,530
 9,520
 61%
Natural gas 74,654
 83,341
 (8,687) (10%)
Total revenues 
$710,187
 
$520,182
 
$190,005
 37%
Revenues for 2014 increased 37% to $710.2 million compared to $520.2 million in 2013 primarily due to the significant increase in oil production, partially offset by the significant decrease in oil prices. Production volumes in 2014 were 12.0 MMBoe, an increase of 20%, compared to production of 10.0 MMBoe in 2013. The increase in production from 2013 to 2014 was primarily due to increased production from new wells in Eagle Ford, Niobrara and Marcellus, partially offset by normal production declines and the sale of our remaining Barnett oil and gas properties to EnerVest.

46



Lease operating expenses for 2014 increased to $74.2 million ($6.19 per Boe) from $46.8 million ($4.68 per Boe) in 2013. The increase in lease operating expenses is primarily due to increased operating costs associated with increased production from new wells in the Eagle Ford, partially offset by the sale of our Barnett properties to EnerVest. The increase in lease operating expense per Boe is primarily due to the sale of lower operating cost per Boe gas properties in the Barnett as well as increased production from higher operating cost per Boe oil properties in the Eagle Ford.
Production taxes increased to $29.5 million (or 4.2% of revenues) in 2014 from $19.8 million (or 3.8% of revenues) in 2013 as a result of increased production, primarily in the Eagle Ford, partially offset by normal production declines. The increase in production taxes as a percentage of revenues was primarily due to increased oil production, which has a higher effective production tax rate as compared to natural gas production.
Ad valorem taxes decreased to $8.5 million in 2014 from $8.7 million in 2013. The decrease in ad valorem taxes is due primarily to lower actual ad valorem taxes than previously estimated for the year ended December 31, 2013 and the sale of our Barnett properties to EnerVest, partially offset by an increase in ad valorem taxes for new wells drilled in Eagle Ford in 2013.
DD&A expense for 2014 increased $103.1 million to $317.4 million ($26.50 per Boe) from the DD&A expense for 2013 of $214.3 million ($21.43 per Boe). The increase in DD&A is attributable to both the increase in production and an increase in the DD&A rate per Boe, which is largely due to the impact of the significant decrease in natural gas reserves in the Barnett as a result of the sale to EnerVest as well as the increase in crude oil reserves, primarily in the Eagle Ford, which have a higher finding cost per Boe than our natural gas reserves. The components of our DD&A expense were as follows:
  Year Ended December 31,
  2014 2013
  (In thousands)
DD&A of proved oil and gas properties 
$313,799
 
$211,157
Depreciation of other property and equipment 1,722
 1,693
Amortization of other assets 1,152
 970
Accretion of asset retirement obligations 710
 471
DD&A 
$317,383
 
$214,291
General and administrative expense decreased to $77.0 million for 2014 from $77.5 million for 2013. The decrease was primarily due to decreases in stock-based compensation costs related to the decrease in the fair value of stock appreciation rights, partially offset by higher compensation costs resulting from an increase in personnel for 2014 compared to 2013.
The gain on derivatives, net for 2014 amounted to $201.9 million primarily due to new hedge positions in 2014 and the significant downward shift in the futures curve of forecasted commodity prices for crude oil and natural gas during the fourth quarter of 2014. The loss on derivatives, net for 2013 amounted to $18.4 millionin 2017 was primarily due to the upward shift in the futures curve of forecasted commoditycrude oil and NGL prices forsubsequent to contract executions of new crude oil and NGL derivative instruments, as well as the upward shift in the futures curve of forecasted crude oil prices subsequent to the acquisition date related to the Contingent ExL Consideration. Additionally, we incurred approximately $18.4 million in deferred premium obligations during 2017. The loss was partially offset by the downward shift in the futures curve of forecasted crude oil and natural gas prices from January 1, 2013 (or the subsequent date prior year contracts were entered into)2017 to December 31, 2013.2017 on crude oil and natural gas derivative instruments outstanding at the beginning of 2017.
Interest expense,The loss on derivatives, net for 2014 was $53.2 million as compared to $54.7 million for 2013. The decreasein 2016 was primarily due to the repurchaseupward shift in the futures curve of forecasted crude oil prices from January 1, 2016 to December 31, 2016 on crude oil derivative instruments outstanding at the beginning of 2016 as well as the upward shift in the futures curve of forecasted crude oil and natural gas prices subsequent to contract executions of new crude oil and natural gas derivative instruments. Additionally, we incurred approximately $5.9 million in deferred premium obligations during 2016.
Interest expense, net
The following table sets forth the components of our interest expense, net for the periods indicated:
  Years Ended December 31,
  2018 2017 2016
  (In thousands)
Interest expense on Senior Notes 
$73,534
 
$95,272
 
$85,819
Interest expense on revolving credit facility 20,910
 8,293
 3,907
Amortization of debt issuance costs, premiums, and discounts 4,077
 4,529
 5,565
Other interest expense 531
 1,029
 1,138
Capitalized interest (36,639) (28,253) (17,026)
Interest expense, net 
$62,413
 
$80,870
 
$79,403
The decrease in interest expense, net in 2018 as compared to 2017 is primarily due to reduced interest expense as a result of the 4.375% convertible senior notesredemptions of the 7.50% Senior Notes in June 2013the fourth quarter of 2017 and the first and fourth quarters of 2018 as well as an increase in capitalized interest as a result of higher average balances of unevaluated leasehold and seismic costs for 2018 as compared to 2017, primarily due to the ExL Acquisition in the third quarter of 2017 and the Devon Acquisition in the fourth quarter of 2018. The decrease was partially offset by interest expense on $250.0 million aggregate principal amount of our 8.25% Senior Notes that were issued in the third quarter of 2017 and increased borrowings and associated interest that was capitalizedexpense on our revolving credit facility for 2018 as compared to 2017.
The increase in interest expense, net in 2017 as compared to 2016 is primarily due to a higher average balanceinterest expense on the $250.0 million aggregate principal amount of unproved properties, partially offset byour 8.25% Senior Notes that were issued in the third quarter of 2017 and an increase in interest expense attributableon our revolving credit facility as a result of increased borrowings in 2017 as compared to 2016, partially offset by an


increase in capitalized interest as a result of higher average balances of unevaluated leasehold and seismic costs for 2017 as compared to 2016, primarily due to the ExL Acquisition in the third quarter of 2017.
Loss on the $300.0extinguishment of debt
As a result of our redemption of $450.0 million aggregate principal amount of our 7.50% Senior Notes that were issued in October 2014 as well as an increase in borrowings under our revolving credit facility. The components2018, we recorded a loss on extinguishment of debt of $9.6 million for the year ended December 31, 2018, which included redemption premiums of $6.0 million paid to redeem the notes and non-cash charges of $3.6 million attributable to the write-off of unamortized premium and debt issuance costs.
As a result of our interest expense, net were as follows:redemption of $150.0 million aggregate principal amount of our 7.50% Senior Notes in 2017, we recorded a loss on extinguishment of debt of $4.2 million for the year ended December 31, 2017, which included a redemption premium of $2.8 million paid to redeem the notes and non-cash charges of $1.4 million attributable to the write-off of unamortized premium and debt issuance costs.
  Year Ended December 31,
  2014 2013
  (In thousands)
Interest expense on Senior Notes 
$78,256
 
$75,707
Interest expense on revolving credit facility 3,265
 2,794
Amortization of debt issuance costs, premiums, and discounts 4,703
 6,037
Other interest expense 1,492
 40
Capitalized interest (34,545) (29,889)
Interest expense, net 
$53,171
 
$54,689
Income taxes and deferred tax assets valuation allowance
The effective income tax rate for the years ended December 31, 2018, 2017, and 2016 was 36.5% for 20141.3%, 4.4%, and 37.1% for 2013. The rates are higher than the U.S. federal statutory rate of 35% primarily due to the impact of state income taxes.

47



Income from discontinued operations, net of income taxes for 2014 amounted to $4.1 million. The income from discontinued operations, net of income taxes is related to the sale of Carrizo UK. The income was primarily due to decreases in estimated future obligations0.0%, respectively, which were nominal as a result of maintaining a full valuation allowance against our net deferred tax assets. For the significant downward shiftyears ended December 31, 2018 and 2017, we recognized income tax expense of $5.2 million and $4.0 million, respectively, related to the Texas franchise tax due to an increase in the futures curveapportionment of forecasted commodity prices for Brent crude oil duringincome to the state of Texas as a result of our divestitures in the fourth quarter of 2014.2017 and first quarter of 2018.
For the year ended December 31, 2016, the effective income tax rate was 0.0% as a result of a full valuation allowance against our net deferred tax assets driven by the impairments of proved oil and gas properties we recognized beginning in the third quarter of 2015 and continuing through the third quarter of 2016.
For each of the years ended December 31, 2018, 2017, and 2016, we maintained a full valuation allowance against our deferred tax assets based on our conclusion, considering all available evidence (both positive and negative), that it was more likely than not that the deferred tax assets would not be realized. A significant item of objective negative evidence considered was the cumulative pre-tax loss incurred over the three-year period ended December 31, 2018, primarily due to impairments of proved oil and gas properties recognized in the first three quarters of 2016, which limits our ability to consider subjective positive evidence, such as its projections of future taxable income.
Dividends on preferred stock
For the years ended December 31, 2018 and 2017, we declared and paid cash dividends of $18.2 million and $7.8 million, respectively, on our Preferred Stock. There were no dividends on our Preferred Stock for the year ended December 31, 2016.
Loss on redemption of preferred stock
During the first quarter of 2018, we redeemed 50,000 shares of Preferred Stock, representing 20% of the issued and outstanding Preferred Stock, for $50.5 million, consisting of the $50.0 million redemption price and $0.5 million accrued and unpaid dividends. We recognized a $7.1 million loss on the redemption due to the excess of the $50.0 million redemption price over the $42.9 million redemption date carrying value of the Preferred Stock.


Liquidity and Capital Resources
20162019 DC&I Capital Expenditure Plan and Funding Strategy. Our initial 20162019 drilling and completionDC&I capital expenditure plan is $270.0$525.0 million to $290.0$575.0 million, of which approximately 59% is allocated to the Eagle Ford and we have alsothe remaining 41% is allocated $15.0 million for leasehold and seismic.to the Delaware Basin. We currently intend to finance our 20162019 DC&I capital expenditure plan primarily from the sources described below under “—Sources and Uses of Cash.” Our capital program could vary depending upon various factors, including, but not limited to, the availability and cost of drilling rigs and completion crews, the cost of completion services, acquisitions and divestitures of oil and gas properties, land and industry partner issues, our available cash flow and financing, success of drilling programs, weather delays, commodity prices, market conditions, the acquisition of leases with drilling commitments and other factors. Our 2015 capital expenditures of $544.2 million were 37% lower than our 2014 capital expenditures of $858.3 million. BelowThe following is a summary of our 20152018 capital expenditures:
 Capital Expenditures
 Three Months Ended Year Ended
 March 31, 2015 June 30, 2015 September 30, 2015 December 31, 2015 December 31, 2015
 (In thousands)
Drilling and completion         
Eagle Ford
$103,338
 
$105,833
 
$105,992
 
$78,727
 
$393,890
Delaware Basin742
 307
 12,892
 18,334
 32,275
Utica22,971
 (2,591) 256
 1,661
 22,297
Niobrara20,486
 12,976
 5,567
 6,649
 45,678
Marcellus3,280
 557
 (2,795) (968) 74
Other745
 385
 175
 135
 1,440
     Total drilling and
     completion
151,562
 117,467
 122,087
 104,538
 495,654
Leasehold and seismic (1)12,440
 18,770
 7,754
 9,533
 48,497
Total (2)
$164,002
 
$136,237
 
$129,841
 
$114,071
 
$544,151
 Three Months Ended Year Ended
 March 31, 2018 June 30, 2018 September 30, 2018 December 31, 2018 December 31, 2018
 (In thousands)
DC&I         
Eagle Ford
$135,677
 
$101,249
 
$149,386
 
$136,644
 
$522,956
Delaware Basin73,892
 116,743
 91,761
 38,768
 321,164
Other284
 
 
 
 284
     Total DC&I209,853
 217,992
 241,147
 175,412
 844,404
Leasehold and seismic5,520
 6,129
 6,668
 4,034
 22,351
Total (1)

$215,373
 
$224,121
 
$247,815
 
$179,446
 
$866,755
 
(1)LeaseholdCapital expenditures exclude acquisitions of oil and seismic for the three months ended June 30, 2015 is presented net of approximately $6.5 million of proceeds related to acreage positions offered to and accepted by joint venture partners.
(2)Our capital expenditure plan and the capital expenditures included above excludegas properties, capitalized general and administrative expense, capitalized interest expense and capitalized asset retirement obligations.costs.
Sources and Uses of Cash. Our primary use of cash is capital expenditures related to our drilling and completion programsDC&I capital expenditures and, to a lesser extent, our leasehold and seismic data acquisition programs.capital expenditures. For the year ended December 31, 2015, capital expenditures and acquisitions of oil and gas properties, net of proceeds from sales of oil and gas properties exceeded our net cash provided by operations for continuing operations. During 2015,2018, we funded our capital expenditures with cash provided by operations and borrowings under our revolving credit facility and a portion of the net proceeds from our March 2015 and October 2015 equity offerings, and, to a lesser degree, our April 2015 debt offering, which were also used to repay borrowings under our revolving credit facility and the repurchase and redemption of our 8.625% Senior Notes.facility. Potential sources of future liquidity include the following:
Cash provided by operations. Cash flows from operations are highly dependent on commoditycrude oil prices. As such, we hedge a portion of our forecasted production to mitigate the riskreduce our exposure to commodity price volatility in order to achieve a more predictable level of a decline in crude oil and natural gas prices.cash flows.
Borrowings under our revolving credit facility. As of February 19, 2016, we had no borrowings outstanding and $0.6 million in letters of credit outstanding under22, 2019, our revolving credit facility which reduce the amounts available under our revolving credit facility.had a borrowing base of $1.3 billion, with an elected commitment amount of $1.1 billion, and $819.0 million of borrowings outstanding. The amount we are able to borrow is subject to compliance with the financial covenants and other provisions of the credit agreement governing our revolving credit facility.
Securities offerings. As situations or conditions arise, we may choose to issue debt, equity or other securities to supplement our cash flows. However, we may not be able to obtain such financing on terms that are acceptable to us, or at all. In March 2015, we sold 5.2 million sharesSee “Note 10. Shareholders’ Equity” of the Notes to our Consolidated Financial Statements for details of our August 2018 common stock in an underwritten public offering at a price of $44.75 per share. We used the proceeds of approximately $231.3 million, net of offering costs, to repay borrowings under our revolving credit facility and for general corporate purposes. On April 28, 2015, we closed a public offering of $650.0 million aggregate principal amount of 6.25% Senior Notes due 2023. The proceeds of $640.3 million, net of underwriting discounts and commissions, were used to repurchase and redeem our 8.625% Senior Notes andoffering.

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temporarily repay borrowings outstanding under our revolving credit facility. In October 2015, we sold 6.3 million shares of our common stock in an underwritten public offering at a price of $37.80 per share. We used the proceeds of approximately $238.8 million, net of offering costs, to repay borrowings under our revolving credit facility and for general corporate purposes.
Asset salesDivestitures. In order to fund our capital expenditure plan, weWe may consider the sale ofdivesting certain properties or assets that are not part of our core business or are no longer deemed essential to our future growth, provided we are able to selldivest such assets on terms that are acceptable to us. We are currently exploring additional asset salesSee “Note 3. Acquisitions and Divestitures of non-core properties.Oil and Gas Properties” of the Notes to our Consolidated Financial Statements for further details.
Joint ventures. Joint ventures with third parties through which such third parties fund a portion of our exploration activities to earn an interest in our exploration acreage or purchase a portion of interests, or both.
Overview of Cash Flow Activities. Net cash provided by operating activities from continuing operations was $378.7$653.6 million, $502.3$423.0 million and $367.5$272.8 million for the years ended December 31, 2015, 20142018, 2017 and 2013,2016, respectively. The decreaseincrease from 20142017 to 20152018 was driven primarily due to a decrease in oil and gas revenues andby an increase in operating expensesrevenues as a result of higher crude oil prices and higher crude oil production and a decrease in working capital requirements, partially offset by an increase in the net cash frompaid for derivative settlements.settlements and an increase in operating expenses and cash general and administrative expense. The increase from 20132016 to 20142017 was driven primarily due to increased crude oilby an increase in revenues as a result of higher production and commodity prices and a decrease in working capital requirements, partially offset by increaseda decrease in the net cash received from derivative settlements and an increase in operating expenses and net cash from derivative settlements.general and administrative expense.
Net cash used in investing activities from continuing operations was $673.4$796.0 million, $940.7 million$1.2 billion and $509.9$619.8 million for the years ended December 31, 2015, 20142018, 2017 and 2013,2016, respectively. The decrease from 20142017 to 20152018 was primarily due to a 37% reductiondecrease in our oil and gas capital expenditures in 2015 as compared to 2014, as well as a decrease related to the Eagle Ford Acquisition in 2014. The increase from 2013 to 2014 related primarily to increased capital expenditures and the Eagle Ford Shale Acquisition as well as lower proceeds from sales cash payments for acquisitions


of oil and gas properties, as well as cash received from the divestitures in Niobrara and Eagle Ford in early 2018, partially offset by an increase in capital expenditures as a result of our ongoing DC&I activity in Eagle Ford and the saleDelaware Basin. The increase from 2016 to 2017 was due primarily to funding the ExL Acquisition and increased capital expenditures, primarily in the Eagle Ford Shale and the Delaware Basin, partially offset by increased net proceeds from divestitures of our remaining oil and gas properties, which primarily related to the divestitures of substantially all of our assets in the Barnett.Marcellus Shale and Utica Shale as well as deposits received in connection with the divestitures of a portion of our assets in the Eagle Ford Shale and substantially all of our assets in the Niobrara.
Net cash provided by financing activities from continuing operations for the years ended December 31, 2015, 20142018, 2017 and 20132016 was $330.8$135.2 million, $300.3$741.8 million and $120.3$308.3 million, respectively. The decrease from 2017 to 2018 was primarily due to payments for the redemptions of our 7.50% Senior Notes and Preferred Stock, decreased cash provided by the issuance of senior notes and Preferred Stock in 2017, and increased cash dividends paid on the Preferred Stock, partially offset by increased borrowings, net of repayments under our revolving credit facility. The increase from 20142016 to 20152017 was due to net proceeds related to the issuance of the 8.25% Senior Notes, the sale of Preferred Stock, the sale of common stock, and increased borrowings net of repayments under our revolving credit facility in March and October 2015 and the issuance of the 6.25% Senior Notes in April 2015,2017 as compared to 2016, partially offset by the tender and redemption of $150.0 million of the 8.625%7.50% Senior Notes, and the payment of the deferred purchase payment in February 2015. The increase from 2013 to 2014 was primarily due to proceeds of $299.8 millionincreased debt issuance costs related to the issuance of the $300.0 million aggregate principal amount of 7.50% Senior Notes received in October 2014 compared to proceeds of $189.7 million relatedamendments to the issuance of common stock in November 2013 lesscredit agreement governing the $69.3 million repurchase of convertible senior notes in June 2013.revolving credit facility and dividends paid on the Preferred Stock.
Liquidity/Cash Flow Outlook. Outlook. Economic downturns may adversely affect our ability to access capital markets in the future. Cash flows from operations are primarily driven by crude oil production, and commodity prices. As a result of the significant decline in crude oil prices, and settlements of our revenues, and thus our cash flows from operations have also declined.crude oil derivatives. We currently believe that cash flows from operations and borrowings under our revolving credit facility will provide adequate financial flexibility and will be sufficient to fund our immediate cash flow requirements.
Revolving credit facility. As of February 19, 2016, we had no borrowings outstanding under our revolving credit facility and had issued $0.6 million in letters of credit, which reduce the amounts available under our revolving credit facility. The borrowing base under our revolving credit facility is affected by assumptions of the administrative agent with respect to, among other things, future crude oil and, to a lesser extent, natural gas prices, which are determined by the administrative agent of our revolving credit facility.prices. Our borrowing base may decrease if our administrative agent reduces its expectations with respect to futurethe crude oil and natural gas prices from those used to determine our existing borrowing base.
The Fall 2015 borrowing base redetermination resulted in a borrowing base See “—Sources and Uses of $685.0 million, which was unchanged from the prior borrowing base. Looking forward to the Spring 2016 borrowing base redetermination, based on currently available bank pricing assumptionsCash—Borrowings under revolving credit facility” and current pricing differentials, drilling and completion plans, and reserve and cost assumptions, the Spring 2016 redetermination is expected to result in a reduction“—Financing Arrangements—Senior Secured Revolving Credit Facility” for further details of our borrowing base to $515.0 million. These assumptions and other matters may change materially. Additionally, the borrowing base amount is subject to considerable discretion by the banks. The amount we are able to borrow is subject to compliance with the financial covenants and other provisions of the credit agreement governing the revolving credit facility.
Hedging.Contingent consideration arrangements. To manageAs part of the ExL Acquisition, as well as in each of the divestitures of our exposureassets in Niobrara, Marcellus, and Utica, we agreed to contingent consideration arrangements, where we will receive or be required to pay certain amounts if commodity prices are greater than specified thresholds. For the year ended December 31, 2018, the specified pricing thresholds related to the Contingent ExL Consideration, the Contingent Niobrara Consideration, and the Contingent Utica Consideration were exceeded. As a result, in January 2019, we paid $50.0 million and received $10.0 million from settlement of these contingent consideration arrangements. See “Note 12. Derivative Instruments” of the Notes to our Consolidated Financial Statements for further details of each of these contingent consideration arrangements and “Item 7A. Qualitative and Quantitative Disclosures about Market Risk” for details of the sensitivities to commodity price risk andfor each contingent consideration arrangement.
Commodity derivative instruments. We use commodity derivative instruments to provide a levelmitigate the effects of certainty in the cash flows to support our drilling and completion capital expenditure program, we hedgecommodity price volatility for a portion of our forecasted production.sales of production and achieve a more predictable level of cash flow.
On February 11, 2015, we entered into derivative transactions offsetting our then existing crude oil derivative positions covering the periods from March 2015 through December 2016, which locked in $166.4 million of cash flows, of which $118.9 million was received due to contract settlements during the year ended December 31, 2015. We will receive

49



approximately $44.8 million of the locked in cash flows in 2016 and will receive the remaining $2.7 million in the first quarter of 2017 as the applicable derivative contracts settle.
Additionally, subsequent to entering into the offsetting derivative transactions described above, we entered into costless collars for periods from March 2015 through December 2016, in-the-money fixed price swaps for periods from January 2016 through December 2016, and sold and purchased out-of-the-money call options for periods from January 2017 through December 2020. As of December 31, 2015,February 22, 2019, we had crude oil fixed price swaps for 9,315 Bbls/dthe following outstanding commodity derivative instruments at a weighted average price of $60.03 per Bblcontract volumes and crude oil costless collars for 5,490 Bbls/d at a weighted average floor price of $50.96 per Bbl and a weighted average ceiling price of $74.73 per Bbl for 2016. See “—Volatility of Crude Oil and Natural Gas Prices” for details of our derivative positions as of December 31, 2015.
In February 2016, we sold out-of-the-money natural gas call options for the years 2017 through 2020 and used the associated premium value to obtain a higher weighted average fixed price of $50.27 per Bbl on newly executed crude oil fixed price swaps for the first half of the year 2017. These out-of-the-money natural gas call options and in-the-money crude oil fixed price swaps were executed contemporaneously with the same counterparty, therefore, no cash premiums were paid to or received from the counterparty as the premium value associated with the natural gas call options was immediately applied to the crude oil fixed price swaps for the first half of the year 2017. See the table below for further details of this transaction.prices:
Period Type of Contract 
Crude Oil
Volumes
(in Bbls/d)
 
Weighted
Average
Floor Price
($/Bbl)
January - June 2017 Fixed Price Swaps 6,000
 
$50.27
Commodity Period Type of Contract Index Volumes
(Bbls
per day)
 
Fixed Price
($ per
Bbl)
 Sub-Floor
Price
($ per
Bbl)
 
Floor
Price
($ per
Bbl)
 
Ceiling
Price
($ per
Bbl)
 Fixed Price
Differential
($ per
Bbl)
Crude oil 1Q19 Three-Way Collars NYMEX WTI 27,000
 
 
$41.67
 
$50.96
 
$74.23
 
Crude oil 1Q19 Basis Swaps LLS-WTI Cushing 6,000
 
 
 
 
 
$5.16
Crude oil 1Q19 Basis Swaps WTI Midland-WTI Cushing 5,500
 
 
 
 
 
($5.24)
Crude oil 1Q19 Sold Call Options NYMEX WTI 3,875
 
 
 
 
$81.07
 
                   
Crude oil 2Q19 Three-Way Collars NYMEX WTI 27,000
 
 
$41.67
 
$50.96
 
$74.23
 
Crude oil 2Q19 Basis Swaps LLS-WTI Cushing 6,000
 
 
 
 
 
$5.16
Crude oil 2Q19 Basis Swaps WTI Midland-WTI Cushing 6,000
 
 
 
 
 
($5.38)
Crude oil 2Q19 Sold Call Options NYMEX WTI 3,875
 
 
 
 
$81.07
 
                   
Crude oil 3Q19 Three-Way Collars NYMEX WTI 27,000
 
 
$41.67
 
$50.96
 
$74.23
 
Crude oil 3Q19 Basis Swaps LLS-WTI Cushing 6,000
 
 
 
 
 
$5.16
Crude oil 3Q19 Basis Swaps WTI Midland-WTI Cushing 7,000
 
 
 
 
 
($5.56)
Crude oil 3Q19 Sold Call Options NYMEX WTI 3,875
 
 
 
 
$81.07
 
                   
Crude oil 4Q19 Three-Way Collars NYMEX WTI 27,000
 
 
$41.67
 
$50.96
 
$74.23
 
Crude oil 4Q19 Basis Swaps LLS-WTI Cushing 6,000
 
 
 
 
 
$5.16
Crude oil 4Q19 Basis Swaps WTI Midland-WTI Cushing 11,000
 
 
 
 
 
($3.84)
Crude oil 4Q19 Sold Call Options NYMEX WTI 3,875
 
 
 
 
$81.07
 
                   
Crude oil 2020 Price Swaps NYMEX WTI 3,000
 
$55.06
 
 
 
 
Crude oil 2020 Three-Way Collars NYMEX WTI 6,000
 
 
$45.00
 
$55.00
 
$64.69
 
Crude oil 2020 Basis Swaps WTI Midland-WTI Cushing 13,000
 
 
 
 
 
($1.27)
Crude oil 2020 Sold Call Options NYMEX WTI 4,575
 
 
 
 
$75.98
 
                   
Crude oil 2021 Basis Swaps WTI Midland-WTI Cushing 6,000
 
 
 
 
 
$0.03
Period Type of Contract 
Natural Gas
Volumes
(in MMBtu/d)
 
Weighted
Average
Ceiling Price
($/MMBtu)
FY 2017 Sold Call Options 33,000
 
$3.00
FY 2018 Sold Call Options 33,000
 
$3.25
FY 2019 Sold Call Options 33,000
 
$3.25
FY 2020 Sold Call Options 33,000
 
$3.50
Commodity Period Type of Contract Index 
Volumes
(MMBtu
per day)
 
Fixed Price
($ per
MMBtu)
 
Sub-Floor
Price
($ per
MMBtu)
 
Floor
Price
($ per
MMBtu)
 
Ceiling
Price
($ per
MMBtu)
 
Fixed Price Differential
($ per
MMBtu)
Natural gas 1Q19 Sold Call options NYMEX Henry Hub 33,000
 
 
 
 
$3.25
 
                   
Natural gas 2Q19 Sold Call options NYMEX Henry Hub 33,000
 
 
 
 
$3.25
 
                   
Natural gas 3Q19 Sold Call options NYMEX Henry Hub 33,000
 
 
 
 
$3.25
 
                   
Natural gas 4Q19 Sold Call options NYMEX Henry Hub 33,000
 
 
 
 
$3.25
 
                   
Natural gas 2020 Sold Call options NYMEX Henry Hub 33,000
 
 
 
 
$3.50
 


Credit Ratings. Our ability to borrow money will be impacted by several factors, including our credit ratings. Credit ratings agencies perform independent analyses when assigning credit ratings. A downgrade of our credit rating could increase our future cost of borrowing, thereby negatively affecting our available liquidity. The following table presents our credit ratings as of February 22, 2019:
Credit Rating
Standard and Poor’s
Corporate Credit RatingB+
Senior Unsecured Debt RatingB+
OutlookStable

Moody’s Investors Service
Corporate Credit RatingB1
Senior Unsecured Debt RatingB2
OutlookStable
If cash flows from operations and borrowings under our revolving credit facility and the other sources of cash described under “—Sources and Uses of Cash” are insufficient to fund our 2016remaining 2019 DC&I capital expenditure plans,plan, we may need to reduce our capital expenditure plansplan or seek other financing alternatives. We may not be able to obtain financing needed in the future on terms that would be acceptable to us, or at all. If we cannot obtain adequate financing, we may be required to limit or defer all or a portion of our 2016remaining 2019 DC&I capital expenditure plans,plan, thereby potentially adversely affecting the recoverability and ultimate value of our oil and gas properties. Subject in each case to then-existingBased on existing market conditions and to our then-expectedexpected liquidity needs, among other factors, we may use a portion of our cash flows from operations, proceeds from asset sales,divestitures, securities offerings or borrowings to reduce debt prior to scheduled maturities through debt repurchases, either in the open market or in privately negotiated transactions, through debt redemptions or tender offers, or through repayments of bank borrowings.

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Contractual Obligations
The following table sets forth estimates of our contractual obligations as of December 31, 20152018 (in(In thousands):
2016 2017 2018 2019 2020 2021 and Thereafter Total2019 2020 2021 2022 2023 2024 and Thereafter Total
Long-term debt (1)
$—
 
$—
 
$—
 
$—
 
$600,000
 
$654,425
 
$1,254,425

$—
 
$—
 
$—
 
$744,431
 
$650,000
 
$250,000
 
$1,644,431
Cash interest on long-term debt (2)85,819
 85,819
 85,819
 85,819
 85,819
 102,998
 532,093
Commitment fees on revolving credit facility (3)2,576
 2,576
 1,310
 
 
 
 6,462
Capital leases1,733
 1,733
 1,700
 1,677
 978
 
 7,821
Cash interest on senior notes (2)
61,250
 61,250
 61,250
 61,250
 40,938
 41,250
 327,188
Cash interest and commitment fees on revolving credit facility (3)
32,839
 32,839
 32,839
 11,311
 
 
 109,828
Operating leases4,055
 4,185
 4,248
 4,357
 4,450
 6,304
 27,599
10,024
 9,154
 6,249
 3,639
 3,680
 20,978
 53,724
Drilling rig contracts (4)24,261
 20,513
 3,957
 
 
 
 48,731
37,077
 16,867
 813
 
 
 
 54,757
Pipeline volume commitments8,596
 7,474
 7,474
 6,141
 3,651
 5,431
 38,767
Delivery commitments (5)
3,726
 2,807
 2,487
 30
 7
 19
 9,076
Produced water disposal commitments (6)
18,139
 20,894
 20,898
 20,954
 10,471
 9,769
 101,125
Asset retirement obligations and other (5)(7)2,937
 1,545
 
 28
 469
 15,230
 20,209
4,537
 1,898
 378
 270
 152
 17,623
 24,858
Total Contractual Obligations
$129,977
 
$123,845
 
$104,508
 
$98,022
 
$695,367
 
$784,388
 
$1,936,107

$167,592
 
$145,709
 
$124,914
 
$841,885
 
$705,248
 
$339,639
 
$2,324,987
 
(1)Long-term debt consists of the principal amounts of the 7.50% Senior Notes due 2020, the 6.25% Senior Notes due 2023, the 8.25% Senior Notes due 2025, and other long-term debt due 2028.borrowings outstanding under our revolving credit facility which matures in 2022.
(2)Cash interest on long-term debtsenior notes includes cash payments for interest on the 7.50% Senior Notes due 2020, the 6.25% Senior Notes due 2023 and other long-term debtthe 8.25% Senior Notes due 2028.2025.
(3)As of December 31, 2015, we had no borrowings outstanding underCash interest on our revolving credit facility therefore, nowas calculated using the weighted average interest is included forrate of the outstanding borrowings outstanding inunder the table above. Asrevolving credit facility as of December 31, 2015, we had $0.6 million in letters2018 of credit outstanding, which reduce the amounts available under4.17%. Commitment fees on our revolving credit facility. Therefore,facility were calculated based on our borrowing base in effect at December 31, 2015, ourthe unused portion of lender commitments was $684.4 million. Commitment fees incurred on this unused portionas of lender commitments are included inDecember 31, 2018, at the table above.applicable commitment fee rate of 0.500%.
(4)
Drilling rig contracts represent gross contractual obligations and accordingly, other joint owners in the properties operated by us will generally be billed for their working interest share of such costs. As of December 31, 2018, early termination of these contracts would have resulted in termination penalties of $29.8 million, which would be in lieu of paying the remaining commitments presented in the table above, and are generally not billed to joint owners. For the years ended December 31, 2018 and 2017, we did not incur any termination penalties. For the year ended December 31, 2016, we incurred $1.8 million of termination penalties which were recorded to other expense, net.
(5)Delivery commitments represent contractual obligations we have entered into for certain gathering, processing and transportation service agreements which require minimum volumes of natural gas to be delivered. The amounts in the table above reflect the aggregate undiscounted deficiency fees assuming no delivery of any natural gas. For the years ended December 31, 2018, 2017 and 2016, we paid


deficiency fees in the amount of $2.0 million, $1.4 million, and $1.4 million, respectively, which were recorded to lease operating expense when incurred. However, as of the filing of this report, we do not expect any material shortfalls in our delivery commitments.
(6)Produced water disposal commitments represent contractual obligations we have entered into for certain service agreements which require minimum volumes of produced water to be delivered. The amounts in the table above reflect the aggregate undiscounted deficiency fees assuming no delivery of any produced water. For the years ended December 31, 2018, 2017 and 2016, we were not required to pay any deficiency fees. Additionally, as of the filing of this report, we do not expect any material shortfalls in our produced water disposal commitments.
(7)
Asset retirement obligations and other are based on estimates and assumptions that affect the reported amounts as of December 31, 2015.2018. Certain of such estimates and assumptions are inherently unpredictable and will differ from actualsactual results. See “Note 2. Summary of Significant Accounting Policies-UsePolicies” of Estimates”the Notes to our Consolidated Financial Statements for further discussion of estimates and assumptions that may affect the reported amounts.
Off Balance Sheet Arrangements
We currently do not have anyno off balance sheet arrangements.
Financing Arrangements
Deferred Purchase Payment
On October 24, 2014, we closed the Eagle Ford Shale Acquisition for an agreed upon purchase price of $250.0 million, net of post-closing and working capital adjustments. The deferred purchase payment of $150.0 million, net of post-closing and working capital adjustments was made in February 2015. We had the intent and ability to refinance this deferred purchase payment on a long-term basis with available capacity under our revolving credit facility, and accordingly, the deferred purchase payment was classified as long-term debt as of December 31, 2014.
Senior Secured Revolving Credit Facility
We have a senior secured revolving credit facility with a syndicate of banks that, as of December 31, 2015,2018, had a borrowing base of $685.0$1.3 billion, with an elected commitment amount of $1.1 billion, and $744.4 million with noof borrowings and $0.6 million in lettersoutstanding at a weighted average interest rate of credit outstanding.4.17%. The credit agreement governing our senior secured revolving credit facility provides for interest-only payments until July 2, 2018,May 4, 2022, when the credit agreement matures and any outstanding borrowings are due. The
On January 31, 2018, as a result of the divestiture in the Eagle Ford Shale, the borrowing base under ourthe senior secured revolving credit agreement is subjectfacility was reduced from $900.0 million to regular redeterminations in$830.0 million, however, the Spring and Fall of each year, as well as special redeterminations described inelected commitment amount remained unchanged at $800.0 million.
On May 4, 2018, we entered into the twelfth amendment to the credit agreement in each case which maygoverning the revolving credit facility to, among other things, increase the borrowing base and elected commitment amount, reduce the amountmargins applied to Eurodollar and base rate loans, and amend the covenant limiting payment of dividends and distributions on equity to increase our ability to make dividends and distributions on our equity interests.
On October 29, 2018, we entered into the borrowing base.
Our obligations underthirteenth amendment to the credit agreement are guaranteed by our material domestic subsidiariesgoverning the revolving credit facility to, among other things, increase the borrowing base and are secured by liens on substantially all of our assets, including a mortgage lien on oilelected commitment amount and gas properties having at least 80%reduce the margins applied to Eurodollar and base rate loans.
See “Note 6. Long-Term Debt” of the proved reserve valueNotes to our Consolidated Financial Statements for additional details of the oiltwelfth and gas properties included in the determinationthirteenth amendments, rates of the borrowing base.

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Amountsinterest on outstanding under the credit agreement bear interest at our option at either (i) a base rate for a base rate loan plus the margin set forth in the table below, where the base rate is defined as the greatest of the prime rate, the federal funds rate plus 0.50% and the adjusted LIBO rate plus 1.00%, or (ii) an adjusted LIBO rate for a Eurodollar loan plus the margin set forth in the table below. We also incurborrowings, commitment fees as set forth in the table below on the unused portion of lender commitments, and which are included as a component of interest expense.
Ratio of Outstanding Borrowings and Letters of Credit to Lender Commitments Applicable Margin for
Base Rate Loans
 Applicable Margin for
Eurodollar Loans
 Commitment Fee
Less than 25% 0.50% 1.50% 0.375%
Greater than or equal to 25% but less than 50% 0.75% 1.75% 0.375%
Greater than or equal to 50% but less than 75% 1.00% 2.00% 0.500%
Greater than or equal to 75% but less than 90% 1.25% 2.25% 0.500%
Greater than or equal to 90% 1.50% 2.50% 0.500%
Wethe financial covenants we are subject to certain covenants under the terms of the credit agreement, which includeagreement.
Redemptions of 7.50% Senior Notes
During the maintenancefourth quarter of 2017, we redeemed $150.0 million of the following financial covenants determined as of the last day of each quarter: (1) a ratio of Total Debt to EBITDA (as defined in the credit agreement) of not more than 4.75 to 1.00 through December 31, 2016, reducing to 4.375 to 1.00 through December 31, 2017, and to 4.00 to 1.00 thereafter; and (2) a Current Ratio (as defined in the credit agreement) of not less than 1.00 to 1.00. As defined in the credit agreement, Total Debt excludes debt discounts and premiums and is net of cash and cash equivalents, EBITDA is for the last four quarters after giving pro forma effect to EBITDA for material acquisitions and dispositions of oil and gas properties, and the Current Ratio includes an add back of the unused portion of lender commitments. As of December 31, 2015, the ratio of Total Debt to EBITDA was 2.67 to 1.00 and the Current Ratio was 3.63 to 1.00. Because the financial covenants are determined as of the last day of each quarter, the ratios can fluctuate significantly period to period as the amounts outstanding under the credit agreement are dependent on the timing of cash flows from operations, capital expenditures, acquisitions and dispositions of oil and gas properties and securities offerings.
Our revolving credit facility also places restrictions on us and certain of our subsidiaries with respect to additional indebtedness, liens, dividends and other payments to shareholders, repurchases or redemptions of our common stock, redemptions of senior notes, investments, acquisitions, mergers, asset dispositions, transactions with affiliates, hedging transactions and other matters.
The credit agreement is subject to customary events of default, including in connection with a change in control. If an event of default occurs and is continuing, the lenders may elect to accelerate amounts due under the credit agreement (except in the case of a bankruptcy event of default, in which case such amounts will automatically become due and payable).
8.625% Senior Notes
On April 14, 2015, we settled a cash tender offer for any or all of the outstanding $600.0 million aggregate principal amount of our 8.625%7.50% Senior Notes at a price equal to 101.875% of 104.613% of the principal amountpar, plus accrued and unpaid interest. In connection with the cash tender offer, we also sent a notice of redemption to the trustee for our 8.625% Senior Notes to conditionally call for redemption on May 14, 2015 all of the 8.625% Senior Notes then outstanding at a price of 104.313% of the principal amount plus accrued and unpaid interest, conditioned upon and subject to our receipt of specified net proceeds from one or more securities offerings, which conditions were satisfied. On April 28, 2015, we made an aggregate cash payment of $276.4 million for the $264.2 million aggregate principal amount of 8.625% Senior Notes validly tendered in the tender offer, which excluded accrued interest paid of $0.8 million. We paid $352.6$156.0 million to redeemupon the 8.625% Senior Notes that remained outstanding,redemption, which represented $335.8 million of outstanding aggregate principal amount of 8.625% Senior Notes, theincluded a redemption premium of $14.5$2.8 million and accrued and unpaid interest of $2.3 million from the last interest payment date up to, but not including, the redemption date. The total price to repurchase and redeem all of the outstanding $600.0 million aggregate principal amount of our 8.625% Senior Notes was $629.8$3.2 million. As a result of the cash tender offer and the redemption, of our 8.625% Senior Notes, we recorded a loss on extinguishment of debt of approximately $38.1$4.2 million, duringwhich included the second quarterredemption premium of 2015.$2.8 million and the write-off of associated unamortized premiums and debt issuance costs of $1.4 million.
7.50% Senior NotesDuring the first and 6.25% Senior Notes
Asfourth quarters of December 31, 2015,2018, we had $600.0redeemed the remaining $320.0 million of the outstanding aggregate principal amount of our 7.50% Senior Notes due 2020 that were issuedat a price equal to 101.875% of par and outstanding. The 7.50% Senior Notes are guaranteed by all of our Material Domestic Subsidiaries (as defined in the credit agreement governing our revolving credit facility).
The 7.50% Senior Notes mature on September 15, 2020, with interest payable semi-annually. We may redeem all or a portion of the 7.50% Senior Notes at any time on or after September 15, 2016 at redemption prices decreasing from 103.750% to 100% of theremaining $130.0 million outstanding aggregate principal amount on September 15, 2018,at a redemption price of 100% of par, respectively, both plus accrued and unpaid interest. Prior to September 15, 2016, we may redeem all or partWe paid a total of $468.6 million upon the 7.50% Senior Notes at 100%redemptions, which included redemption premiums of the principal amount thereof, plus$6.0 million and accrued and unpaid interest andof $12.6 million. As a make whole

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premium (as defined in the indenture governing the 7.50% Senior Notes). Holdersresult of the 7.50% Senior Notes may require us to repurchase some or allredemptions, we recorded a loss on extinguishment of their 7.50% Senior Notes for cash indebt of $9.6 million, which included the eventredemption premiums of a Change$6.0 million and the write-off of Control (as defined inassociated unamortized premiums and debt issuance costs of $3.6 million.
Redemption of Preferred Stock
During the indenture governing the 7.50% Senior Notes), at 101%first quarter of 2018, we redeemed 50,000 shares of Preferred Stock, representing 20% of the principal amount plusissued and outstanding Preferred Stock, for $50.5 million, consisting of the $50.0 million redemption price and $0.5 million accrued and unpaid interest.dividends. We recognized a $7.1 million loss on the redemption due to the excess of the $50.0 million redemption price over the $42.9 million redemption date carrying value of the Preferred Stock.
As

Redemption of December 31, 2015,Other Long-Term Debt
During the second quarter of 2018, we had $650.0redeemed the remaining $4.4 million aggregateoutstanding principal amount of 6.25%our 4.375% Convertible Senior Notes due 2023 that were issued and outstanding. The 6.25% Senior Notes are guaranteed by the same subsidiaries that guarantee our 7.50% Senior Notes.
The 6.25% Senior Notes mature on April 15, 2023, with interest payable semi-annually. Before April 15, 2018, we may redeem all or2028 at a portion of our 6.25% Senior Notes at 100% of the principal amount plus a make-whole premium. Thereafter, we may redeem all or a portion of our 6.25% Senior Notes at redemption prices decreasing from 104.688%price equal to 100% of the principal amount on April 15, 2018, pluspar. Upon redemption, we paid $4.5 million, which included accrued and unpaid interest. In addition, prior to April 15, 2018, we may, at our option, redeem up to 35%interest of the aggregate principal amount of the 6.25% Senior Notes with the proceeds of certain equity offerings at a redemption price of 106.25% of the principal amount, plus accrued and unpaid interest. Holders of the 6.25% Senior Notes may require us to repurchase some or all of their 6.25% Senior Notes for cash in the event of a Change of Control (as defined in the indenture governing the 6.25% Senior Notes), at 101% of the principal amount plus accrued and unpaid interest.
The indentures governing the 7.50% Senior Notes and the 6.25% Senior Notes contain covenants that, among other things, limit our ability and the ability of our restricted subsidiaries to: pay distributions on, purchase or redeem our common stock or other capital stock or redeem our subordinated debt; make investments; incur or guarantee additional indebtedness or issue certain types of equity securities; create certain liens; sell assets; consolidate, merge or transfer all or substantially all of our assets; enter into agreements that restrict distributions or other payments from our restricted subsidiaries to us; engage in transactions with affiliates; and create unrestricted subsidiaries. Such indentures governing our senior notes are also subject to customary events of default, including those related to failure to comply with the terms of the notes and the indenture, certain failures to file reports with the SEC, certain cross defaults of other indebtedness and mortgages and certain failures to pay final judgments.$0.1 million.
Common Stock OfferingsOffering
In October 2015,On August 17, 2018, we sold 6.3completed a public offering of 9.5 million shares of our common stock in an underwritten public offering at a price per share of $37.80 per share. We used the proceeds of approximately $238.8 million, net of offering costs, to repay borrowings under our revolving credit facility and for general corporate purposes.
In March 2015, we sold 5.2 million shares of our common stock in an underwritten public offering at a price of $44.75 per share. We used the proceeds of approximately $231.3 million, net of offering costs, to repay borrowings under our revolving credit facility and for general corporate purposes.
In November 2013, we sold 4.5 million shares of our common stock in an underwritten public offering at a price to the underwriter of $42.24 per share.$22.55. We used the net proceeds of approximately $189.7$213.7 million, net of offering costs, to fund a portion of our increased capital expenditure planthe Devon Acquisition and for other general corporate purposes.
Effects of Inflation and Changes in Prices
Our results of operations and operating cash flows are affected by changes in oil and gas prices. Natural gas prices have declined significantly since mid-2008 and continue to remain depressed. More recently, crude oil prices have declined significantly since 2014 and currently remain depressed, which has adversely affected our results of operations. If crude oil prices continue to weaken or do not rebound, it is expected to have a significant impact on future results of operations and operating cash flows. Historically, inflation has had a minimal effect on us. However, with interest rates at historic lows and the government attempting to stimulate the economy through rapid expansion of the money supply in recent years, inflation could become a significant issue in the future.
Summary of Critical Accounting Policies
The following summarizes our critical accounting policies. See a complete list of significant accounting policies in “Note 2. Summary of Significant Accounting Policies” of the Notes to our Consolidated Financial Statements.
Discontinued Operations
On February 22, 2013, we closed on the sale of Carrizo UK Huntington Ltd, a wholly owned subsidiary of the Company (“Carrizo UK”), and all of its interest in the Huntington Field discovery, including a 15% non-operated working interest and certain overriding royalty interests, to a subsidiary of Iona Energy Inc. (“Iona Energy”) for an agreed-upon price of $184.0 million, including the assumption and repayment by Iona Energy of the $55.0 million of borrowings outstanding under Carrizo UK’s senior secured multicurrency credit facility as of the closing date. The liabilities, results of operations and cash flows associated with Carrizo UK have been classified as discontinued operations in our consolidated financial statements. Unless otherwise indicated, the information included relates to our continuing operations. Information related to discontinued operations is included in “Note

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3. Discontinued Operations,” “Note 15. Condensed Consolidating Financial Information” and “Note 18. Supplemental Disclosures about Oil and Gas Producing Activities (Unaudited)” of the Notes to our Consolidated Financial Statements.
Use of Estimates
The preparation of financial statements in conformity with U.S. generally accepted accounting principlesGAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the periods reported. Certain of such estimates and assumptions are inherently unpredictable and will differ from actual results. We evaluate subsequent events through the date the financial statements are issued.
Significant estimates include volumes of proved oil and gas reserves, which are used in calculating depreciation, depletion and amortization (“DD&A”)&A of proved oil and gas property costs, the present value of estimated future net revenues included in the full cost ceiling test, estimates of future taxable income used in assessing the realizability of deferred tax assets, and the estimated costs and timing of cash outflows underlying asset retirement obligations. Oil and gas reserve estimates, and therefore calculations based on such reserve estimates, are subject to numerous inherent uncertainties, the accuracy of which, is a function of the quality and quantity of available data, the application of engineering and geological interpretation and judgment to available data and the interpretation of mineral leaseholds and other contractual arrangements, including adequacy of title and drilling requirements and royalty obligations.requirements. These estimates also depend on assumptions regarding quantities and production rates of recoverable oil and gas reserves, oil and gas prices, timing and amounts of development costs and operating expenses, all of which will vary from those assumed in our estimates. Other significant estimates are involved in determining acquisition date fair values of assets acquired and liabilities assumed, impairments of unevaluated leasehold costs, fair values of commodity derivative assets and liabilities, fair values of contingent consideration arrangements, preferred stock fair value upon issuance, grant date fair value of stock-based compensation, collectability of receivables,awards, and in evaluating disputed claims, interpreting contractual arrangements (including royalty obligations and notional interest calculations) and contingencies. Estimates are based on current assumptions that may be materially affected by the results of subsequent drilling and completion, testing and production as well as subsequent changes in oil and gas prices, counterparty creditworthiness, interest rates and the market value and volatility of our common stock.
Oil and Gas Properties
Oil and gas properties are accounted for using the full cost method of accounting under which all productive and nonproductive costs directly associated with property acquisition, exploration and development activities are capitalized to cost centers established on a country-by-country basis. The internal cost of employee compensation and benefits, including stock-based compensation, directly associated with acquisition, exploration and development activities are capitalized to either proved or unproved oil and totaled $15.8 million, $18.8 million and $15.0 million forgas properties based on the years ended December 31, 2015, 2014 and 2013, respectively.type of activity. Internal costs related to production, general corporate overhead and similar activities are expensed as incurred.
Capitalized oil and gas property costs within a cost center are amortized on an equivalent unit-of-production method, converting natural gas to barrels of oil equivalent at the ratio of six thousand cubic feet of gas to one barrel of oil, which represents their approximate relative energy content. The equivalent unit-of-production amortization rate is computed on a quarterly basis by dividing current quarter production by proved oil and gas reserves at the beginning of the quarter then applying such amortization rate to capitalizedproved oil and gas property costs, which includes estimated asset retirement costs, less accumulated amortization, plus the estimated future expenditures (based on current costs) to be incurred in developing proved reserves, net of estimated salvage values. Average DD&A per Boe of proved oil and gas properties was $22.05, $26.20 and $21.38 for the years ended December 31, 2015, 2014 and 2013, respectively.
Unproved properties, not being amortized, include unevaluated leasehold and seismic costs associated with specific unevaluated properties the cost of exploratory wells in progress, and related capitalized interest. Exploratory wells in progress and individuallyIndividually significant unevaluated leaseholds are assessed on a quarterly basis to determine whether or not and to what extent proved reserves have been assigned to the properties or if an impairment has occurred, in which case the related costs along with associated capitalized interest are addedreclassified to theproved oil and gas property costs subject to amortization.properties. Factors we consider in our impairment assessment include drilling results by us and other operators, the terms of oil and gas leases not held by production and drilling and completionDC&I capital expenditure plans. We expectIndividually insignificant unevaluated leaseholds are grouped by major area and added to complete our evaluationproved oil and gas properties based on the average primary lease term of the majority of our unevaluated leaseholds within the next five years and exploratory wells in progress within the next year.properties. Geological and


geophysical costs not associated with specific prospects are recorded to proved oil and gas property costs subject to amortization immediately. We capitalized interest costs associated with our unproved properties totaling $32.1 million, $34.5 million and $29.9 million for the years ended December 31, 2015, 2014 and 2013, respectively.as incurred. The amount of interest costs capitalized is determined on a quarterly basis based on the average balance of unproved properties using aand the weighted average interest rate based onof outstanding borrowings.
Proceeds from the sale of proved and unproved oil and gas properties are recognized as a reduction of capitalizedproved oil and gas property costs with no gain or loss recognized, unless the sale significantly alters the relationship between capitalized costs

54



and proved reserves of oil and gas attributable to a cost center. For 2015the years ended December 31, 2018, 2017 and 2014,2016, we did not have any sales of oil and gas properties that significantly altered such relationship. On February 22, 2013, we closed
Impairment of Proved Oil and Gas Properties
At the saleend of Carrizo UK, which included alleach quarter, the net book value of our proved reserves in its U.K. cost center. As a result, in the first quarter of 2013, we recognized a $37.3 million pre-tax gain in “Net income from discontinued operations, net of income taxes” in the consolidated statements of operations. Further, on October 31, 2013, we closed the sale of our remaining oil and gas properties, in the Barnett. The proved reserves attributable to the Barnett sale represented 40% of our proved reserves as of October 31, 2013, which significantly altered the relationship between capitalized costs and proved reserves of oil and gas attributable to our U.S. cost center. As a result, we recognized a pre-tax loss on the sale of $45.4 million in “Loss on sale of oil and gas properties” in the consolidated statements of operations in the fourth quarter of 2013.
Full Cost Ceiling Test Impairment
Capitalized costs, less accumulated amortization and related deferred income taxes, are limited to the “cost center ceiling” equal to (i) the sum of (A)(a) the present value of estimated future net revenues from proved oil and gas reserves, less estimated future expenditures to be incurred in developing and producing the proved reserves computed using a discount factor of 10%, (B)(b) the costs of unproved properties not being amortized, and (C)(c) the lower of cost or estimated fair value of unproved properties included in the costs being amortized; less (ii) related income tax effects. IfAny excess of the net capitalized costs exceedbook value of oil and gas properties, less related deferred income taxes, over the cost center ceiling the excess is recognized as an impairment of proved oil and gas properties. An impairment recognized in one period may not be reversed in a subsequent period even if higher oil and gascommodity prices in the future increase theresult in a cost center ceiling applicable toin excess of the subsequent period.net book value of oil and gas properties, less related deferred income taxes.
The estimated future net revenues used in the cost center ceiling are calculated using the average realized prices for sales of crude oil, NGLs, and natural gas on the first calendar day of each month during the preceding 12-month period prior to the end of the current reporting period. Prices arequarter (“12-Month Average Realized Price”), held constant indefinitely and are not changedflat for the life of the production, except where different prices are fixed and determinable from applicable contracts for the remaining term of those contracts. Prices do not include the impact of derivative instruments because the Companyas we elected not to meet the criteria to qualify its derivative instruments for hedge accounting treatment.
During 2015, we recorded after-tax impairments in the carrying value of proved oil and gas properties of $795.8 million ($1,224.4 million pre-tax) due primarily to declines in the average realized prices for sales of oil on the first calendar day of each month during the trailing 12-month period. The decrease in average realized prices as described aboveWe did not have a significant adverse effect to our proved oil and gas reserve volumes. There were norecognize impairments of proved oil and gas properties for the years ended December 31, 20142018 and 2013.2017. Primarily due to declines in the 12-Month Average Realized Prices of crude oil, we recognized impairments of proved oil and gas properties for the year ended December 31, 2016. Details of the 12-Month Average Realized Price of crude oil for the years ended December 31, 2018, 2017 and 2016 and the impairments of proved oil and gas properties for the year ended December 31, 2016 are summarized in the table below: 

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  Years Ended December 31,
  2018 2017 2016
Impairment of proved oil and gas properties (In thousands) 
$—
 
$—
 $576,540
Crude Oil 12-Month Average Realized Price ($/Bbl) - Beginning of period $49.87 $39.60 $47.24
Crude Oil 12-Month Average Realized Price ($/Bbl) - End of period $63.80 $49.87 $39.60
Crude Oil 12-Month Average Realized Price percentage increase (decrease) during period 28% 26% (16%)



The table below presents various pricing scenarios to demonstrate the sensitivity of our December 31, 2018 cost center ceiling to changes in 12-month average benchmark crude oil and natural gas prices underlying our average realized prices after considering the results of our full cost ceiling test for the period. Prices do not include the impact of crude oil and natural gas derivative instruments. This12-Month Average Realized Prices. The sensitivity analysis is as of December 31, 20152018 and, accordingly, does not consider drilling results,and completion activity, acquisitions or dispositions of oil and gas properties, production, changes in crude oil and natural gas prices, and changes in future development and operating costs occurring subsequent to December 31, 20152018 that may require revisions to ourestimates of proved reserve estimates.reserves. See also Part I, “Item 1A. Risk Factors—If crude oil and natural gas prices continuedecline to decline,near or remain at lowbelow levels experienced in 2015 and 2016 we expect tocould be required to record additional impairments of proved oil and gas properties that would constitute a charge to earnings and reduce our shareholders’ equity.”
  12-Month Average Realized Prices Excess (deficit) of cost center ceiling over net capitalized costs (after-tax) 
Increase (decrease)
of cost center ceiling over net capitalized costs (after-tax)
Full Cost Pool Scenarios Crude Oil ($/Bbl) Natural Gas ($/Mcf) (In millions) (In millions)
December 31, 2015 Actual $47.24 $1.87 $— $—
         
Oil and Gas Price Sensitivity        
Oil and Gas +10% $52.27 $2.13 $218 $218
Oil and Gas -10% $42.22 $1.62 ($218) ($218)
         
Oil Price Sensitivity        
Oil +10% $52.27 $1.87 $195 $195
Oil -10% $42.22 $1.87 ($195) ($195)
         
Gas Price Sensitivity        
Gas +10% $47.24 $2.13 $22 $22
Gas -10% $47.24 $1.62 ($22) ($22)
  12-Month Average Realized Prices Excess (deficit) of cost center ceiling over net book value, less related deferred income taxes 
Increase (decrease)
of cost center ceiling over net book value, less related deferred income taxes
Full Cost Pool Scenarios Crude Oil ($/Bbl) Natural Gas ($/Mcf) (In millions) (In millions)
December 31, 2018 Actual $63.80 $2.46 $1,369  
         
Crude Oil and Natural Gas Price Sensitivity        
Crude Oil and Natural Gas +10% $70.36 $2.78 $1,947 $578
Crude Oil and Natural Gas -10% $57.26 $2.14 $795 ($574)
         
Crude Oil Price Sensitivity        
Crude Oil +10% $70.36 $2.46 $1,894 $525
Crude Oil -10% $57.26 $2.46 $849 ($520)
         
Natural Gas Price Sensitivity        
Natural Gas +10% $63.80 $2.78 $1,422 $53
Natural Gas -10% $63.80 $2.14 $1,315 ($54)
The price of crude oil, which is the commodity price that our cost center ceiling is most sensitive to as presented in the table above, decreased during the fourth quarter of 2018 and has remained at lower levels in early 2019. We estimate that the SEC average benchmark NYMEXfirst quarter of 2019 cost center ceiling will exceed the net book value, less related deferred income taxes, resulting in no impairment of proved oil price to be used in the calculationand gas properties. This estimate of the fullfirst quarter of 2019 cost center ceiling test is based on the estimated 12-Month Average Realized Price of crude oil of $61.27 per barrel as of March 31, 2016, to be $45.85 per Bbl2019, which is based on the average realized price for sales of crude oil on the first calendar day of each month oil prices available for the first 11 months ended February 1, 2016 and using a NYMEX strip pricean estimate for the twelfth month. This ismonth based on a 9% decrease fromquoted forward price.
We further sensitized the SEC average benchmark NYMEX12-Month Average Realized Price of crude oil by using $50.00 per barrel. Under this scenario, our cost center ceiling would exceed the net book value, less related deferred income taxes, resulting in no impairment of proved oil and gas properties.
Both of these estimates assume that all other inputs and assumptions are as of December 31, 2018, other than the price usedof crude oil, and remain unchanged. As such, drilling and completion activity, acquisitions or dispositions of oil and gas properties, production, and changes in development and operating costs occurring subsequent to December 31, 2018 may require revisions to estimates of proved reserves, which would impact the calculation of the full cost ceiling test as of December 31, 2015 of $50.28 per Bbl. Using the forecasted SEC average benchmark NYMEX pricing described above, as well as current costs, we anticipate recording an additional after-tax impairment in the carrying value of our proved oil and gas properties in the first quarter of 2016 in the range of $200.0 million to $300.0 million ($307.7 million to $461.5 million pre-tax). Further impairments in subsequent quarters may occur if the trailing 12-month commodity prices continue to be lower than the comparable trailing 12-month commodity prices discussed above.center ceiling.
Oil and Gas Reserve Estimates
The proved oil and gas reserve estimates as of December 31, 20152018 included in this document have been prepared by Ryder Scott Company, L.P.,(" (“Ryder Scott"Scott”), independent third party reserve engineers. Reserve engineering is a subjective process of estimating underground accumulations of hydrocarbons that cannot be measured in an exact manner. The process relies on judgment and the interpretation of available geologic, geophysical, engineering and production data. The extent, quality and reliability of this data can vary. The process also requires assumptions regarding drilling and operating costs, taxes and availability of funds. The oil and gas reserve estimation and disclosure requirements mandate certain of these assumptions such as existing economic and operating conditions, average crude oil and natural gas prices and the discount rate.
Proved oil and gas reserve estimates prepared by others may be substantially higher or lower than Ryder Scott’s estimates. Significant assumptions used in the proved oil and gas reserve estimates are assessed by both Ryder Scott and our internal reserve team. All reserve reports prepared by Ryder Scott are reviewed by our senior management team, including the Chief Executive


Officer and Chief Operating Officer. Because these estimates depend on many assumptions, all of which may differ from actual results, reserve quantities actually recovered may be significantly different than estimated. Material revisions to reserve estimates may be made depending on the results of drilling, testing, and production.
It should not be assumed that the present value of future net cash flows is the current market value of our estimated proved oil and gas reserves. In accordance with the oil and gas reserve estimation and disclosure requirements, the discounted future net cash flows from proved reserves are based on the unweighted average of the first day of the month price for each month in the previous twelve-month period, using current costs and a 10% discount rate.

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Our depletion rate depends on our estimate of total proved reserves. IfHolding all other factors constant, if our estimates of total proved reserves increased or decreased, the depletion rate and therefore DD&A expense of proved oil and gas properties would decrease or increase, respectively.
Derivative Instruments
We use commodity derivative instruments to reduce our exposure tomitigate the effects of commodity price volatility for a substantial, but varying, portion of our forecasted crude oil and natural gassales of production and thereby achieve a more predictable level of cash flows to support our drilling and completion capital expenditure program.flow. All commodity derivative instruments are recorded onin the consolidated balance sheets as either an asset or liability measured at fair value. We net our commodity derivative instrument fair value amounts executed with the same counterparty, along with any deferred premium obligations, to a single asset or liability pursuant to ISDA master agreements,International Swap Dealers Association Master Agreements (“ISDAs”), which provide for net settlement over the term of the contract and in the event of default or termination of the contract. As weWe do not enter into commodity derivative instruments for speculative purposes.
We have entered into agreements for acquisitions or divestitures of oil and gas properties that include obligations to pay the seller or rights to receive from the buyer, respectively, additional consideration if commodity prices exceed specified thresholds during certain periods in the future. These contingent consideration liabilities and assets are required to be bifurcated and accounted for separately as derivative instruments as they are not considered to be clearly and closely related to the host contract, and recognized at their acquisition or divestiture date fair value in the consolidated balance sheets.
We have elected not to meet the criteria to qualify our commodity derivative instruments for hedge accounting treatment,treatment. Therefore, all gains and losses as a result of changes in the fair value of commodity derivative instruments, as well as our contingent consideration arrangements, are recognized as (gain)“(Gain) loss on derivatives, netnet” in the consolidated statements of operations in the period in which the changes occur. The netDeferred premium obligations associated with our commodity derivative instruments are recognized as “(Gain) loss on derivatives, net” in the consolidated statements of operations in the period in which the deferred premium obligations are incurred.
Cash flows are impacted to the extent that settlements of commodity derivative instruments, including deferred premium obligations, and contingent consideration arrangements result in cash flows resulting fromreceived or paid during the payments toperiod and receipts from counterpartiesare recognized as a result“Cash received (paid) for derivative settlements, net” in the consolidated statements of derivative settlementscash flows. Cash received or paid in settlement of contingent consideration assets or liabilities, respectively, are classified as cash flows from financing activities up to the divestiture or acquisition date fair value with any excess classified as cash flows from operating activities. We do not enter into derivative instruments for speculative or trading purposes.
Our Board of Directors establishes risk management policies and, on a quarterly basis, reviews our commodity derivative instruments, including volumes, types of instruments and counterparties. These policies require that commodity derivative instruments be executed only by the President or Chief Financial Officer after consultation with and concurrence by the President, Chief Financial Officer and Chairman of the Board.
Preferred Stock and Common Stock Warrants
We apply the accounting standards for distinguishing liabilities from equity when determining the classification and measurement of preferred stock. Preferred stock that is not mandatorily redeemable is excluded from liability classification and is evaluated for classification in shareholders’ equity or temporary equity. As the number of common shares that could be delivered upon the holders’ optional redemption is indeterminate, we cannot assert that we will be able to settle in shares of our common stock and, as a result, present preferred stock as temporary equity. On a quarterly basis, we reassess the presentation of preferred stock in the consolidated balance sheets.
When preferred stock is issued in conjunction with common stock warrants, the common stock warrants are evaluated separately as a freestanding financial instrument to determine whether they must be recorded as a derivative instrument. We further evaluate the common stock warrants for equity classification and have determined that they qualify for equity classification and, therefore, are presented in additional paid-in capital in the consolidated balance sheets. The preferred stock and common stock warrants are recorded based on the net proceeds received allocated to the two instrument’s relative fair values. The preferred stock is subject to accretion from its relative fair value at the issuance date to the redemption value using the effective interest method. The common stock warrants do not require further adjustments from their relative fair value at the issuance date.


Dividends and accretion associated with preferred stock are presented in the consolidated statements of operations as reductions to net income, or increases of net loss, to derive net income (loss) attributable to common shareholders. Dividend payments are presented as a financing activity in the consolidated statement of cash flows.
Income Taxes
Income taxes are recognized based on earnings reported for tax return purposes in addition to a provision for deferred income taxes. Deferred income taxes are recognized at the end of each reporting period for the future tax consequences of cumulative temporary differences between the tax bases of assets and liabilities and their reported amounts in our financial statements based on existing tax laws and enacted statutory tax rates applicable to the periods in which the temporary differences are expected to affect taxable income. We assess the realizability of our deferred tax assets each periodon a quarterly basis by considering whether it is more likely than not that all or a portion of the deferred tax assets will not be realized. We consider all available evidence (both positive and negative) when determining whether a valuation allowance is required. WeIn making this assessment, we evaluated possible sources of taxable income that may be available to realize the benefit of deferred tax assets, including projected future taxable income, the reversal of existing temporary differences, taxable income in carryback years and available tax planning strategies in making this assessment.strategies.
For each of the years ended December 31, 2018, 2017, and 2016, we maintained a full valuation allowance against our deferred tax assets based on our conclusion, considering all available evidence (both positive and negative), that it was more likely than not that the deferred tax assets would not be realized. A significant item of objective negative evidence considered was the cumulative historical three year pre-tax loss and a net deferred tax asset position atincurred over the three-year period ended December 31, 2015, driven2018, primarily by the full cost ceilingdue to impairments recognized during the third and fourth quarters of 2015, which limits the ability to consider other subjective evidence such as our anticipated future growth. In addition, we also expect to recognize an additional impairment of ourproved oil and gas properties duringrecognized in the first three quarters of 2016, which limits our ability to consider subjective positive evidence, such as its projections of future taxable income.
We currently believe it is reasonably possible for us to achieve a three-year cumulative level of profitability within the next 12 months, as early as the first quarter of 2016. We also had U.S. federal net operating loss carryforwards of $366.8 million as of December 31, 2015. As a result of the historical and projected future losses, we concluded2019, which would enhance our ability to conclude that it is more likely than not that the deferred tax assets will notwould be realized and recordedsupport a release of a portion or substantially all of the valuation allowance against the net deferred tax asset asallowance. A release of December 31, 2015 of $324.7 million, reducing the net deferred tax asset to zero.
We will continue to evaluate whether the valuation allowance is neededwould result in future reporting periods. The valuation allowance will remain until we can determine that the netrecognition of an increase in deferred tax assets are more likely than not to be realized. Future events or new evidenceand an income tax benefit in the period in which may lead us to conclude that it is more likely than not that our net deferred tax assets will be realized include, but are not limited to, cumulative historical pre-tax earnings, improvements in oil prices,the release occurs, although the exact timing and taxable events that could result from one or more transactions. The valuation allowance does not impact future utilizationamount of the underlying tax attributes. As long asrelease is subject to change based on numerous factors, including our projections of future taxable income, which we conclude that the valuation allowance against our net deferred tax assets is necessary, we likely will not have any additional income tax expense or benefit. As a result of the anticipated impairment in the carrying value of oil and gas properties in the first quarter of 2016, we expectcontinue to record an additional valuation allowance against any deferred tax asset generated by such impairment.assess based on available information each reporting period.
We classify interest and penalties associated with income taxes as interest expense. We followapply the tax law ordering approach to determine the sequence in which deferred tax assets and other tax attributes are utilized.
Commitments and Contingencies
Liabilities are recognized for contingencies when (i) it is both probable that an asset has been impaired or that a liability has been incurred and (ii) the amount of such loss is reasonably estimable. See “Note 8. Commitments and Contingencies” of the Notes to our Consolidated Financial Statements for further discussion.
RecentRecently Adopted and Recently Issued Accounting Pronouncements
See “Note 2. Summary of Significant Accounting Policies - Recent Accounting Pronouncements”Policies” of the Notes to our Consolidated Financial Statements for discussion of the recent accounting pronouncements issued by the Financial Accounting Standards Board.

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Volatility of Crude Oil and Natural Gas Prices
Our revenues, future rate of growth, results of operations, financial position and ability to borrow funds or obtain additional capital are substantially dependent upon prevailing prices of crude oil and natural gas, which are affected by changes in market demand, overall economic activity, weather, pipeline capacity constraints, inventory storage levels, basis differentials and other factors. In 2015, average realized crude oil prices decreased 49% to $44.69 per Bbl from $88.40 per Bbl in 2014. Average natural gas prices decreased 43% to $1.72 per Mcf in 2015 from $3.00 per Mcf in 2014.
We review the carrying value of our oil and gas properties on a quarterly basis using the full cost method of accounting. See “—Summary of Critical Accounting Policies—Full Cost Ceiling Test Impairment.” See also Part I, “Item 1A. Risk Factors—If oil and natural gas prices continue to decline, or remain at low levels, we expect to record additional impairments of oil and gas properties that would constitute a charge to earnings and reduce our shareholders’ equity” and “Note 5. Property and Equipment, Net” of the Notes to our Consolidated Financial Statements.
We use commodity derivative instruments to reduce our exposure to commodity price volatility for a substantial, but varying, portion of our forecasted oil and gas production and thereby achieve a more predictable level of cash flows to support our drilling and completion capital expenditure program. We do not enter into derivative instruments for speculative or trading purposes. As of December 31, 2015, our commodity derivative instruments consisted of fixed price swaps, costless collars, and purchased and sold call options, which are described below:
Fixed Price Swaps: We receive a fixed price and pay a variable market price to the counterparties over specified periods for contracted volumes.
Costless Collars: A collar is a combination of options including a purchased put option (fixed floor price) and a sold call option (fixed ceiling price) and allows us to benefit from increases in commodity prices up to the fixed ceiling price and protect us from decreases in commodity prices below the fixed floor price. At settlement, if the market price is below the fixed floor price or is above the fixed ceiling price, we receive the fixed price and pay the market price. If the market price is between the fixed floor price and fixed ceiling price, no payments are due from either party. These contracts were executed contemporaneously with the same counterparties and were premium neutral such that no premiums were paid to or received from the counterparties.
Sold Call Options: These contracts give the counterparties the right, but not the obligation, to buy contracted volumes from us over specified periods and prices in the future. At settlement, if the market price exceeds the fixed price of the call option, we pay the counterparty the excess. If the market price settles below the fixed price of the call option, no payment is due from either party.
Purchased Call Options: These contracts give us the right, but not the obligation, to buy contracted volumes from the counterparties over specified periods and prices in the future. At settlement, if the market price exceeds the fixed price of the call option, the counterparties pay us the excess. If the market price settles below the fixed price of the call option, no payment is due from either party.
The following sets forth a summary of our open crude oil derivative positions at average NYMEX prices as of December 31, 2015.
Period Type of Contract 
Volumes
(in Bbls/d)
 
Weighted
Average
Floor Price
($/Bbl)
 
Weighted
Average
Ceiling Price
($/Bbl)
2016 Fixed Price Swaps 9,315
 $60.03  
2016 Costless Collars 5,490
 $50.96 $74.73
2018 Sold Call Options 2,488
   
$60.00
2018 Sold Call Options 900
   
$75.00
2019 Sold Call Options 2,975
   
$62.50
2019 Sold Call Options 900
   
$77.50
2020 Sold Call Options 3,675
   
$65.00
2020 Sold Call Options 900
   
$80.00

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On February 11, 2015, we entered into derivative transactions offsetting our then existing crude oil derivative positions covering the periods from March 2015 through December 2016. As a result of the offsetting derivative transactions, we locked in $166.4 million of cash flows, of which $118.9 million was received due to contract settlements during the year ended December 31, 2015, and is included in the gain on derivatives, net in the consolidated statements of operations. As of December 31, 2015, the fair value of the remaining locked in cash flows is $47.5 million, of which $44.8 million is a current asset and is classified as "Derivative assets" in the consolidated balance sheets. The derivative assets associated with the offsetting derivative transactions are not subject to price risk and the locked in cash flows will be received as the applicable contracts settle. Included in the $99.3 million gain on derivatives, net for the year ended December 31, 2015 is an $8.4 million gain representing the increase in fair value of the then-existing crude oil derivative positions from December 31, 2014 to February 11, 2015. The offsetting derivative transactions are not included in the table above.
Additionally, subsequent to entering into the offsetting derivative transactions described above, we entered into costless collars for the periods from March 2015 through December 2016 that will continue to provide us with downside protection at crude oil prices below the weighted average floor prices yet allow us to benefit from an increase in crude oil prices up to the weighted average ceiling prices. During the third and fourth quarter of 2015, we sold out-of-the-money call options for the years 2017 through 2020 at ceiling prices of $60.00 per Bbl, $60.00 per Bbl, $62.50 per Bbl, and $65.00 per Bbl, respectively, and used the premium value associated with the sale of those out-of-the-money call options to obtain a higher weighted average fixed price of $60.03 per Bbl on newly executed fixed price swaps for the year 2016. These out-of-the-money call options and in-the-money fixed price swaps were executed contemporaneously with the same counterparties, therefore, no cash premiums were paid to or received from the counterparties as the premium value associated with the call options was immediately applied to the fixed price swaps for the year 2016.
During the fourth quarter of 2015, crude oil prices continued on a downward trend which decreased the value of call option contracts. In December 2015, we used this opportunity to purchase all of our previously existing 2017 sold call options. We also raised the ceiling on portions of our sold call options in 2018, 2019, and 2020 by buying back 900 Bbls/d of our then existing sold call options described above and simultaneously selling 900 Bbls/d of out-of-the-money call options for the years 2018 through 2020 at ceiling prices of $75.00 per Bbl, $77.50 per Bbl, and $80.00 per Bbl, respectively. The crude oil derivative positions table above shows the net effect of the purchased and sold out-of-the-money call options for each of the years 2017 through 2020. As a result of the purchased and sold out-of-the-money call options executed in December 2015, we incurred net premiums of approximately $5.0 million, the payment of which is deferred until settlement. See “—Liquidity and Capital Resources—Liquidity/Cash Flow Outlook—Hedging” for details of transactions entered into subsequent to December 31, 2015.
For the years ended December 31, 2015, 2014 and 2013, we recorded in the consolidated statements of operations a gain on derivatives, net of $99.3 million, $201.9 million, and a loss on derivatives, net of $18.4 million, respectively.
We typically have numerous hedge positions that span several time periods and often result in both fair value asset and liability positions held with that counterparty, which positions are all offset to a single fair value asset or liability at the end of each reporting period. We include any deferred premiums associated with our hedge positions in the fair value amounts. We net our derivative instrument fair value amounts executed with the same counterparty pursuant to ISDA master agreements, which provide for net settlement over the term of the contract and in the event of default or termination of the contract. The fair value of derivative instruments where we are in a net asset position with our counterparties as of December 31, 2015 and 2014 totaled $119.6 million and $214.8 million, respectively, and is summarized by counterparty in the table below:
Counterparty December 31, 2015 December 31, 2014
Societe Generale 37% 26%
Wells Fargo 35% 37%
Citibank 13% %
Regions 9% 8%
Union Bank 5% 4%
Capital One 1% %
Credit Suisse % 24%
Royal Bank of Canada % 1%
Total 100% 100%
The counterparties to our derivative instruments are also lenders under our credit agreement which allows us to satisfy any need for margin obligations resulting from adverse changes in the fair value of our derivative instruments with the collateral securing the credit agreement, thus eliminating the need for independent collateral posting.
Because each of the counterparties have investment grade credit ratings, we believe we do not have significant credit risk and accordingly do not currently require our counterparties to post collateral to support the net asset positions of our derivative

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instruments. As such, we are exposed to credit risk to the extent of nonperformance by the counterparties to our derivative instruments. Although we do not currently anticipate such nonperformance, we continue to monitor the credit ratings of our counterparties.
Item 7A. Qualitative and Quantitative Disclosures about Market Risk
Commodity Price Risk
Our primary market risk exposure is the commodity pricing applicablerevenues, future rate of growth, results of operations, financial position and ability to our oil and gas production. The prices we realize on the sale of such productionborrow funds or obtain additional capital are primarily driven by thesubstantially dependent upon prevailing worldwide price for oil and spot prices of crude oil, NGLs, and natural gas.gas, which are affected by changes in market supply and demand and other factors. The effects of such pricing volatilitymarkets for crude oil, NGLs, and natural gas have been discussed above,volatile, especially over the last several years, and such volatility is expectedthese markets will likely continue to continue. A 10% fluctuationbe volatile in the price received forfuture.
The following table sets forth our crude oil, production would have an approximate $37.6 million impact on our revenuesNGL, and a 10% fluctuation in the price received fornatural gas production would have an approximate $3.8 million impact on our revenues for the year ended December 31, 2015.2018 as well as the impact on the crude oil, NGL, and natural gas revenues assuming a 10% increase and decrease in our average realized crude oil, NGL, and natural gas prices, excluding the impact of derivative settlements:

 Year Ended December 31, 2018
  Crude oil NGLs Natural gas Total
  (In thousands)
Revenues 
$911,554
 
$96,585
 
$57,803
 
$1,065,942
         
Impact of a 10% fluctuation in average realized prices 
$91,155
 
$9,659
 
$5,780
 
$106,594


We use commodity derivative instruments to reduce our exposure tomitigate the effects of commodity price volatility for a substantial, but varying, portion of our forecasted oil and gassales of production and thereby achieve a more predictable level of cash flows to support our drilling and completion capital expenditure program.flow. We do not enter into commodity derivative instruments for speculative or trading purposes. As of December 31, 2015,2018, our commodity derivative instruments consisted of fixed pricethree-way collars, basis swaps, costless collars, and purchased and sold call options. ForSee “Note 12. Derivative Instruments” and “Note 16. Subsequent Events” of the yearsNotes to our Consolidated Financial Statements for further discussion of our commodity derivative instruments as of December 31, 2018 and our commodity derivative instruments entered into subsequent to December 31, 2018.
The following table sets forth the cash paid for derivative settlements, net, excluding deferred premium obligations, for the year ended December 31, 2015, 20142018 as well as the impact on the cash paid for derivative settlements, net assuming a 10% increase and 2013, we recordeddecrease in the consolidated statementsrespective settlement prices:
  Year Ended December 31, 2018
  Crude oil NGLs Natural gas Total
  (In thousands)
Cash paid for derivative settlements, net 
($78,570) 
($6,378) 
($1,710) 
($86,658)
         
Impact of a 10% increase in settlement prices 
($69,853) 
($5,383) 
($3,501) 
($78,737)
Impact of a 10% decrease in settlement prices 
$54,698
 
$5,383
 
$3,018
 
$63,099
The primary drivers of operationsour commodity derivative instrument fair values are the underlying forward oil and gas price curves. The following table sets forth the average forward oil and gas price curves as of December 31, 2018 for each of the years in which we have commodity derivative instruments:
  2019 2020 2021
Crude oil:      
NYMEX WTI $47.09 $49.14 $50.37
LLS-WTI Cushing $4.81 $4.03 $3.42
WTI Midland-WTI Cushing ($4.09) ($0.15) $0.55
Natural gas:      
NYMEX Henry Hub $2.78 $2.66 $2.61
The following table sets forth the fair values as of December 31, 2018, excluding deferred premium obligations, as well as the impact on the fair values assuming a gain on derivatives, net10% increase and decrease in the underlying forward oil and gas price curves that are shown above:
  Crude oil NGLs Natural gas Total
  (In thousands)
Fair value (liability) asset as of December 31, 2018 
$31,775
 
$617
 
($2,000) 
$30,392
         
Impact of a 10% increase in forward commodity prices 
($21,915) 
$—
 
($1,617) 
($23,532)
Impact of a 10% decrease in forward commodity prices 
$16,890
 
$—
 
$819
 
$17,709
We had no settlements of $99.3 million, $201.9 million, and a loss on derivatives, net of $18.4 million, respectively.contingent consideration arrangements for the year ended December 31, 2018.
Financial Instruments and Debt Maturities
In addition to our derivative instruments, our other financial instruments consist of cash and cash equivalents, receivables, payables, and long-term debt. The carrying amounts of cash and cash equivalents, receivables, and payables approximate fair value due to the highly liquid or short-term nature of these instruments. The fair values of the contingent consideration arrangements were determined by a third-party valuation specialist using Monte Carlo simulations including significant inputs such as forward oil and gas price curves, volatility factors and risk adjusted discount rates. See “Note 12. Derivative Instruments” and “Note 13. Fair Value Measurements” of the Notes to our 7.50% Senior Notes,Consolidated Financial Statements for further discussion.


The following table sets forth the fair values of the contingent consideration arrangements as of December 31, 2018, as well as the impact on the fair values assuming a 10% increase and decrease in the underlying forward oil and gas price curves that are shown above:
  Contingent ExL Consideration Contingent Niobrara Consideration Contingent Marcellus Consideration Contingent Utica Consideration
  (In thousands)
Potential (payment) receipt per year 
($50,000) 
$5,000
 
$3,000
 
$5,000
Maximum potential (payment) receipt 
($125,000) 
$15,000
 
$7,500
 
$15,000
         
Fair value (liability) asset as of December 31, 2018 
($80,584) 
$7,035
 
$1,369
 
$7,501
Impact of a 10% increase in forward commodity prices 
($7,466) 
$900
 
$669
 
$972
Impact of a 10% decrease in forward commodity prices 
$7,846
 
($775) 
($564) 
($887)
Interest Rate Risk
We are exposed to market risk due to the floating interest rate associated with any outstanding borrowings on our revolving credit facility. Changes in interest rates do not impact the amount of interest we pay on our fixed-rate 6.25% Senior Notes and other8.25% Senior Notes, but can impact their fair values. As of December 31, 2018, we had approximately $1.6 billion of long-term debt asoutstanding. Of this amount, approximately $0.9 billion was fixed-rate debt with a weighted average interest rate of December 31, 2015 were estimated at7.01% and approximately $528.0 million, $533.0 million, and $4.2 million, respectively, and were based$0.7 billion was floating-rate debt on quoted market prices. As of December 31, 2015, scheduled maturities of debt are $600.0 million in 2020, $650.0 million in 2023, and $4.4 million in 2028. We had nooutstanding borrowings outstanding underon our revolving credit facility aswith a weighted average interest rate of December 31, 2015.4.17%. A 1% increase or decrease in the interest rate on outstanding borrowings on our revolving credit facility would have a corresponding increase or decrease in our interest expense of approximately $4.8 million. See “Note 13. Fair Value Measurements” of the Notes to our Consolidated Financial Statements for further details on the fair value of our 6.25% Senior Notes and 8.25% Senior Notes.
Item 8. Financial Statements and Supplementary Data
The financial statements and information required by this Item appears on pages F-1 through F-40F-50 of this Annual Report on Form 10-K.
Item 9. Changes In and Disagreements With Accountants on Accounting and Financial Disclosures
None.
Item 9A. Controls and Procedures
(a) Disclosure Controls and Procedures
We maintain disclosure controls and procedures that are designed to provide reasonable assurance that information required to be disclosed by us in the reports that we file or submit to the SEC under the Securities Exchange Act of 1934, as amended (the “Exchange Act”), is recorded, processed, summarized and reported within the time periods specified by the SEC’s rules and forms, and that information is accumulated and communicated to our management, including our Chief Executive Officer and Chief Financial Officer, as appropriate to allow timely decisions regarding required disclosure.
In accordance with Rules 13a-15(b) and 15d-15(b) under the Exchange Act, we carried out an evaluation, under the supervision and with the participation of management, including our Chief Executive Officer and Chief Financial Officer, of the effectiveness of our disclosure controls and procedures (as defined by Rules 13a-15(e) and 15d-15(e) under the Exchange Act) as of the end of the period covered by this Annual Report on Form 10-K. As described below under paragraph (b) within Management’s Annual Report on Internal Control over Financial Reporting, our Chief Executive Officer and Chief Financial Officer have concluded that, as of the end of the period covered by this Annual Report on Form 10-K, our disclosure controls and procedures were effective to provide reasonable assurance that information required to be disclosed by us in the reports that we file or submit to the SEC under the Exchange Act is recorded, processed, summarized and reported within the time periods specified by the SEC’s rules and forms and that such information is accumulated and communicated to our management, including our Chief Executive Officer and Chief Financial Officer, as appropriate to allow timely decisions regarding required disclosure.
The audit report of KPMG,Ernst & Young LLP which is included in this Annual Report on Form 10-K, expressed an unqualified opinion on our consolidated financial statements.

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(b) Management’s Annual Report on Internal Control over Financial Reporting
Our management is responsible for establishing and maintaining adequate internal control over financial reporting as defined in Rules 13a-15(f) and 15d-15(f) under the Exchange Act. Our internal control over financial reporting is designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. Our internal control over financial reporting includes those policies and procedures that:
pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect our transactions and dispositions of our assets;
provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that our receipts and expenditures are being made only in accordance with authorizations of our management and directors; and
provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of our assets that could have a material effect on the financial statements.
While “reasonable assurance” is a high level of assurance, it does not mean absolute assurance. Because of its inherent limitations, internal control over financial reporting may not prevent or detect every misstatement and instance of fraud. Controls are susceptible to manipulation, especially in instances of fraud caused by collusion of two or more people, including our senior management. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.
Under the supervision and with the participation of our Chief Executive Officer and Chief Financial Officer, our management conducted an evaluation of the effectiveness of our internal control over financial reporting as of December 31, 2015.2018. In making this evaluation, management used the Internal Control – Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission (“COSO”). Based on the results of our evaluation, our management concluded that our internal control over financial reporting was effective as of December 31, 2015.2018.
KPMGErnst & Young LLP, our independent registered public accounting firm that audited our consolidated financial statements, has also issued its own audit report on the effectiveness of our internal control over financial reporting as of December 31, 2015,2018, which is filed with this Annual Report on Form 10-K.
(c) Changes in Internal Control over Financial Reporting
There have not been any changes in our internal control over financial reporting during the quarter ended December 31, 20152018 that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.
Item 9B. Other Information
None.
PART III
Item 10. Directors, Executive Officers and Corporate Governance
The information required by this item is incorporated herein by reference to our definitive Proxy Statement (the “2016“2019 Proxy Statement”) for our 20162019 annual meeting of shareholders.shareholders to be held on May 16, 2019. The 20162019 Proxy Statement will be filed with the SEC not later than 120 days subsequent to December 31, 20152018.
Item 11. Executive Compensation
The information required by this item is incorporated herein by reference to the 20162019 Proxy Statement, which will be filed with the SEC not later than 120 days subsequent to December 31, 20152018.
Item 12. Security Ownership of Certain Beneficial Owners and Management and Related Shareholder Matters
The information required by this item is incorporated herein by reference to the 20162019 Proxy Statement, which will be filed with the SEC not later than 120 days subsequent to December 31, 20152018.
Item 13. Certain Relationships and Related Transactions, and Director Independence
The information required by this item is incorporated herein by reference to the 20162019 Proxy Statement, which will be filed with the SEC not later than 120 days subsequent to December 31, 20152018.

61




Item 14. Principal Accounting Fees and Services
The information required by this item is incorporated herein by reference to the 20162019 Proxy Statement, which will be filed with the SEC not later than 120 days subsequent to December 31, 20152018.
PART IV
Item 15. Exhibits and Financial Statement Schedules
(a)(1) Financial Statements
The responseRefer to this item is submitted in a separate sectionthe Index to Consolidated Financial Statements on page F-1 of this Annual Report on Form 10-K.10-K for a list of all financial statements filed as part of this report.
(a)(2) Financial Statement Schedules
None.Financial statement schedules have been omitted because they are either not required, not applicable or the information required to be presented is included in the Company’s consolidated financial statements and related notes.
(a)(3) Exhibits
EXHIBIT INDEX
Exhibit
Number
 Description
2.1Asset Purchase Agreement dated October 24, 2014 by and between Eagle Ford Minerals, LLC and Carrizo (Eagle Ford) LLC (incorporated herein by reference to Exhibit 2.1 to the Company’s Current Report on Form 8-K filed on October 27, 2014 (File No. 000-29187-87)).
3.1Amended and Restated Articles of Incorporation of the CompanyCarrizo Oil & Gas, Inc. (incorporated herein by reference to Exhibit 3.1 to the Company’s Annual Report on Form 10-K for the year ended December 31, 1997 (File No. 000-29187-87)).
†3.2
†3.3
†3.4
†3.5
†3.6
†4.1
†4.2
†4.3
†4.4
†4.5


4.54.6
4.64.7
4.74.8

62



4.84.9
4.94.10
4.104.11
4.114.12
4.124.13
4.134.14
4.144.15
4.154.16
4.164.17
4.174.18


4.184.19
4.194.20
4.204.21
†4.22
4.214.23

63



4.224.24Form of
*†10.1
*†10.2Form
*†10.3Form of Employment Agreement between Carrizo Oil & Gas, Inc. and future non-executive officers as of May 1, 2015 (incorporated by reference to Exhibit 10.3 to the Company’s Quarterly report on Form 10-Q for the quarter ended March 31, 2015 (File No. 000-29187-87)).
*†10.4Amended and Restated Employment Agreement between the Company and S.P. Johnson IV (incorporated herein by reference to Exhibit 10.2 to the Company’s Current Report on Form 8-K filed on June 9, 2009 (File No. 000-29187-87)).
*†10.5Retirement and Consulting Agreement effective as of August 11, 2014 by and between Carrizo Oil & Gas, Inc. and Paul F. Boling (incorporated herein by reference to Exhibit 10.1 to the Company’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2014 (File No. 000-29187-87)).
*†10.6Amended and Restated Employment Agreement between the Company and J. Bradley Fisher (incorporated herein by reference to Exhibit 10.4 to the Company’s Current Report on Form 8-K filed on June 9, 2009 (File No. 000-29187-87)).
*†10.7Retirement and Consulting Agreement effective as of August 11, 2014 by and between Carrizo Oil & Gas, Inc. and Gregory E. Evans (incorporated herein by reference to Exhibit 10.7 to the Company’s Annual Report on Form 10-K for the year ended December 31, 2014 (File No. 100-29187-87)).
*†10.8Amended and Restated Employment Agreement between the Company and Richard H. Smith (incorporated herein by reference to Exhibit 10.6 to the Company’s Current Report on Form 8-K filed on June 9, 2009 (File No. 000-29187-87)).
*†10.9Employment Agreement between the Company and David L. Pitts (incorporated herein by reference to Exhibit 10.1 to the Company’s Current Report on Form 8-K filed on January 20, 2010May 16, 2017 (File No. 000-29187-87)000-291870-87)).
*†10.1010.3Employment Agreement between the Company and Gregory F. Conaway (incorporated herein by reference to Exhibit 10.10 to the Company’s Annual Report on Form 10-K for the year ended December 31, 2014 (File No. 100-29187-87)).
*10.11Employment Agreement between the Company and Gerald A. Morton, General Counsel and Vice President - Business Development (Executive Officer).
*†10.12Form of Stock Option Award Agreement (incorporated herein by reference to Exhibit 10.43 to the Company’s Annual Report on Form 10-K for the year ended December 31, 2004 (File No. 000-29187-87)).
*†10.13Form of Director Restricted Stock Unit Award Agreement under the Incentive Plan of Carrizo Oil & Gas, Inc. (incorporated herein by reference to Exhibit 10.1 to the Company’s Current Report on Form 8-K filed on June 17, 2013 (File No. 000-29187-87)).
*†10.14Form of 2010 Employee Restricted Stock Unit Award Agreement (with performance-based vesting and time-based vesting) (incorporated herein by reference to Exhibit 10.12 to the Company’s Annual Report on Form 10-K for the year ended December 31, 2010 (File No. 000-29187-87)).
*†10.15Form of Employee Restricted Stock Award Agreement (Officer) under the Incentive Plan of Carrizo Oil & Gas, Inc. (incorporated herein by reference to Exhibit 10.2 to the Company’s Current Report on Form 8-K filed on June 17, 2013 (File No. 000-29187-87)).
*†10.16Form of Employee Restricted Stock Unit Award Agreement (Officer) under the Incentive Plan of Carrizo Oil & Gas, Inc. (incorporated herein by reference to Exhibit 10.3 to the Company’s Current Report on Form 8-K filed on June 17, 2013 (File No. 000-29187-87)).
*†10.17Form of 2009 Employee Cash or Stock Settled Stock Appreciation Rights Award Agreement under the Carrizo Oil & Gas, Inc. Incentive Plan (incorporated herein by reference to Exhibit 10.9 to the Company’s Current Report on Form 8-K filed on June 9, 2009 (File No. 000-29187-87)).

64



*†10.18Form of Employee Stock Appreciation Rights Agreement (Officer) under Incentive Plan of Carrizo Oil & Gas, Inc. (incorporated herein by reference to Exhibit 10.4 to the Company’s Current Report on Form 8-K filed on June 17, 2013 (File No. 000-29187-87)).
*†10.19Carrizo Oil & Gas, Inc. Cash-Settled Stock Appreciation Rights Plan (incorporated herein by reference to Exhibit 10.10 to the Company’s Current Report on Form 8-K filed on June 9, 2009 (File No. 000-29187-87)).
*†10.2010.4
*†10.2110.5
*†10.6
*†10.7
*†10.8
*†10.9
*†10.10
*†10.11


*†10.12
*†10.13
*†10.2210.14
*10.15
*10.16
*†10.17
*†10.18
*†10.19
*†10.20
*10.2310.21S Corporation Tax Allocation, Payment and Indemnification
*10.2410.22S Corporation Tax Allocation, Payment
*10.23
*10.24
*10.25
*10.26
*10.27
*10.28
†10.29
10.2610.30


10.2710.31
10.2810.32
10.2910.33
10.3010.34
10.3110.35
10.3210.36

65



10.3310.37Form of Indemnification Agreement between the Company and each of its directors and executive officers (incorporated herein by reference to Exhibit 10.6 to the Company’s Annual Report on Form 10-K for the year ended December 31, 1997 (File No. 000-29187-87)).
†10.34Form of
†10.35Omnibus Amendmentdated as of May 3, 2016, among Carrizo (Marcellus) LLC, Carrizo Oil & Gas, Inc., Avista Capital Partners II, L.P.as borrower, Wells Fargo Bank, National Association, as administrative agent, and ACP II Marcellus LLC, dated as of September 10, 2010 (incorporated herein by reference to Exhibit 10.3 to the Company’s Current Report on Form 8-K filed on September 16, 2010 (File No. 000-29187-87)).
†10.36Amended and Restated Participation Agreement, dated as of November 16, 2010, and effective as of October 1, 2010, among Carrizo (Marcellus) WV LLC, Carrizo Oil & Gas, Inc., Avista Capital Partners II, L.P. and ACP II Marcellus LLClender parties thereto (incorporated herein by reference to Exhibit 10.1 to the Company’s Current Report on Form 8-K filed on November 19, 2010May 4, 2016 (File No. 000-29187-87)).
†10.38
†10.39
†10.40
†10.41
†10.42
†10.43
†10.44


†10.45
†10.46
21.1
23.1
23.2
23.3
31.1
31.2
32.1
32.2
99.1
101Interactive Data Files.
 
†    Incorporated by reference as indicated.
*    Management contract or compensatory plan or arrangement.
+Schedules to this exhibit have been omitted pursuant to Item 601(b) of Regulation S-K; a copy of the omitted schedules will be furnished to the U.S. Securities and Exchange Commission supplementally upon request.


66




INDEX TO CONSOLIDATED FINANCIAL STATEMENTS
 
 PAGE



F-1



Report of Independent Registered Public Accounting Firm

To the Shareholders and the Board of Directors of Carrizo Oil & Gas, Inc.

Opinion on the Financial Statements
We have audited the accompanying consolidated balance sheets of Carrizo Oil & Gas, Inc. (the Company) as of December 31, 2018 and 2017, and the related consolidated statements of operations, shareholders’ equity and cash flows for each of the two years in the period ended December 31, 2018, and the related notes (collectively referred to as the “consolidated financial statements”). In our opinion, the consolidated financial statements present fairly, in all material respects, the financial position of the Company at December 31, 2018 and 2017, and the results of its operations and its cash flows for each of the two years in the period ended December 31, 2018 in conformity with U.S. generally accepted accounting principles.

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (PCAOB), the Company’s internal control over financial reporting as of December 31, 2018, based on criteria established in Internal Control-Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (2013 framework) and our report dated February 28, 2019 expressed an unqualified opinion thereon.

Basis for Opinion
These financial statements are the responsibility of the Company’s management. Our responsibility is to express an opinion on the Company’s financial statements based on our audits. We are a public accounting firm registered with the PCAOB and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.

We conducted our audits in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement, whether due to error or fraud. Our audits included performing procedures to assess the risks of material misstatement of the financial statements, whether due to error or fraud, and performing procedures that respond to those risks. Such procedures included examining, on a test basis, evidence regarding the amounts and disclosures in the financial statements. Our audits also included evaluating the accounting principles used and significant estimates made by management, as well as evaluating the overall presentation of the financial statements. We believe that our audits provide a reasonable basis for our opinion.


/s/ Ernst & Young LLP

We have served as the Company’s auditor since 2017.

Houston, Texas
February 28, 2019



Report of Independent Registered Public Accounting Firm

To the Shareholders and the Board of Directors of Carrizo Oil & Gas, Inc.

Opinion on Internal Control over Financial Reporting

We have audited Carrizo Oil & Gas, Inc.’s internal control over financial reporting as of December 31, 2018, based on criteria established in Internal Control-Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (2013 framework) (the COSO criteria). In our opinion, Carrizo Oil & Gas, Inc. (the Company) maintained, in all material respects, effective internal control over financial reporting as of December 31, 2018, based on the COSO criteria.

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (PCAOB), the consolidated balance sheets as of December 31, 2018 and 2017, and the related consolidated statements of operations, shareholders’ equity and cash flows for each of the two years in the period ended December 31, 2018, and the related notes and our report dated February 28, 2019 expressed an unqualified opinion thereon.

Basis for Opinion

The Company’s management is responsible for maintaining effective internal control over financial reporting and for its assessment of the effectiveness of internal control over financial reporting included in the accompanying Management’s Annual Report on Internal Control over Financial Reporting. Our responsibility is to express an opinion on the Company’s internal control over financial reporting based on our audit. We are a public accounting firm registered with the PCAOB and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.

We conducted our audit in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether effective internal control over financial reporting was maintained in all material respects.

Our audit included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, testing and evaluating the design and operating effectiveness of internal control based on the assessed risk, and performing such other procedures as we considered necessary in the circumstances. We believe that our audit provides a reasonable basis for our opinion.

Definition and Limitations of Internal Control Over Financial Reporting

A company’s internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. A company’s internal control over financial reporting includes those policies and procedures that (1) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (2) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and directors of the company; and (3) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the company’s assets that could have a material effect on the financial statements.
Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.
/s/ Ernst & Young LLP

Houston, Texas
February 28, 2019


Report of Independent Registered Public Accounting Firm

The Board of Directors and Shareholders
Carrizo Oil & Gas, Inc.:

We have audited the accompanying consolidated balance sheets of Carrizo Oil & Gas, Inc. and subsidiaries (the Company) as of December 31, 2015 and 2014, and the related“Company”) consolidated statements of operations, shareholders’ equity, and cash flows for each of the years in the three‑year period ended December 31, 2015.2016. These consolidated financial statements are the responsibility of the Company’s management. Our responsibility is to express an opinion on these consolidated financial statements based on our audits.audit.

We conducted our auditsaudit in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan the audit and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement. An audit includes examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements. An audit also includes assessing the accounting principles used and significant estimates made by management, as well as evaluating the overall financial statement presentation. We believe that our audits provideaudit provides a reasonable basis for our opinion.

In our opinion, the consolidated financial statements referred to above present fairly, in all material respects, the financial position of Carrizo Oil & Gas, Inc. and subsidiaries as of December 31, 2015 and 2014, and theCompany’s results of their operations, shareholders’ equity and their cash flows for each of the years in the three‑year period ended December 31, 2015,2016, in conformity with U.S. generally accepted accounting principles.
We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States), the Company’s internal control over financial reporting as of December 31, 2015, based on criteria established in Internal Control - Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO), and our report dated February 22, 2016 expressed an unqualified opinion on the effectiveness of the Company’s internal control over financial reporting.

/s/ KPMG LLP
Houston, Texas
February 22, 2016

F-2



Report of Independent Registered Public Accounting Firm
The Board of Directors and Shareholders
Carrizo Oil & Gas, Inc.:

We have audited Carrizo Oil & Gas, Inc.’s internal control over financial reporting as of December 31, 2015, based on criteria established in Internal Control - Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO). Carrizo Oil & Gas, Inc.’s management is responsible for maintaining effective internal control over financial reporting and for its assessment of the effectiveness of internal control over financial reporting, included in the accompanying Management’s Report on Internal Control over Financial Reporting. Our responsibility is to express an opinion on Carrizo Oil & Gas, Inc.’s internal control over financial reporting based on our audit.
We conducted our audit in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether effective internal control over financial reporting was maintained in all material respects. Our audit included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, and testing and evaluating the design and operating effectiveness of internal control based on the assessed risk. Our audit also included performing such other procedures as we considered necessary in the circumstances. We believe that our audit provides a reasonable basis for our opinion.
A company’s internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with U.S. generally accepted accounting principles. A company’s internal control over financial reporting includes those policies and procedures that (1) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (2) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with U.S. generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and directors of the company; and (3) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the company’s assets that could have a material effect on the financial statements.
Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.
In our opinion, Carrizo Oil & Gas, Inc. maintained, in all material respects, effective internal control over financial reporting as of December 31, 2015, based on criteria established in Internal Control - Integrated Framework (2013) issued by the COSO.
We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States), the consolidated balance sheets of Carrizo Oil & Gas, Inc. and subsidiaries as of December 31, 2015 and 2014, and the related consolidated statements of operations, shareholders’ equity, and cash flows for each of the years in the three-year period ended December 31, 2015, and our report dated February 22, 2016 expressed an unqualified opinion on those consolidated financial statements.
/s/ KPMG LLP
Houston, Texas
February 22, 201627, 2017


F-3









CARRIZO OIL & GAS, INC.
CONSOLIDATED BALANCE SHEETS
(In thousands, except share and per share data)amounts)
 December 31, December 31,
 2015 2014 2018 2017
Assets        
Current assets        
Cash and cash equivalents 
$42,918
 
$10,838
 
$2,282
 
$9,540
Accounts receivable, net 54,721
 92,946
 99,723
 107,441
Derivative assets 131,100
 171,101
 39,904
 
Other current assets 3,443
 3,736
 8,460
 5,897
Total current assets 232,182
 278,621
 150,369
 122,878
Property and equipment        
Oil and gas properties, full cost method        
Proved properties, net 1,369,151
 2,086,727
 2,333,470
 1,965,347
Unproved properties, not being amortized 335,452
 535,197
 673,833
 660,287
Other property and equipment, net 12,258
 7,329
 11,221
 10,176
Total property and equipment, net 1,716,861
 2,629,253
 3,018,524
 2,635,810
Deferred income taxes 46,758
 
Derivative assets 1,115
 43,684
Debt issuance costs 24,873
 25,403
Other assets 5,116
 4,515
Other long-term assets 16,207
 19,616
Total Assets 
$2,026,905
 
$2,981,476
 
$3,185,100
 
$2,778,304
        
Liabilities and Shareholders’ Equity        
Current liabilities        
Accounts payable 
$74,065
 
$106,819
 
$98,811
 
$74,558
Revenues and royalties payable 67,808
 66,954
 49,003
 52,154
Accrued capital expenditures 39,225
 106,149
 60,004
 119,452
Accrued interest 21,981
 21,149
 18,377
 28,362
Liabilities of discontinued operations 2,666
 4,405
Deferred income taxes 46,758
 61,258
Derivative liabilities 55,205
 57,121
Other current liabilities
32,981
 57,570

40,609
 41,175
Total current liabilities 285,484
 424,304
 322,009
 372,822
Long-term debt 1,255,676
 1,351,346
 1,633,591
 1,629,209
Liabilities of discontinued operations 1,088
 8,394
Deferred income taxes 
 77,349
Asset retirement obligations 16,183
 12,187
 18,360
 23,497
Derivative liabilities 12,648
 17
 40,817
 112,332
Other liabilities 11,772
 4,438
Deferred income taxes 8,017
 3,635
Other long-term liabilities 6,980
 51,650
Total liabilities 1,582,851
 1,878,035
 2,029,774
 2,193,145
Commitments and contingencies 

 

 

 

Preferred stock    
Preferred stock, $0.01 par value, 10,000,000 shares authorized; 200,000 issued and outstanding as of December 31, 2018 and 250,000 issued and outstanding as of December 31, 2017 174,422
 214,262
Shareholders’ equity        
Common stock, $0.01 par value, 90,000,000 shares authorized; 58,332,993 issued and outstanding as of December 31, 2015 and 46,127,924 issued and outstanding as of December 31, 2014 583
 461
Common stock, $0.01 par value, 180,000,000 shares authorized; 91,627,738 issued and outstanding as of December 31, 2018 and 81,454,621 issued and outstanding as of December 31, 2017 916
 815
Additional paid-in capital 1,411,081
 915,436
 2,131,535
 1,926,056
Retained earnings (Accumulated deficit) (967,610) 187,544
Accumulated deficit (1,151,547) (1,555,974)
Total shareholders’ equity 444,054
 1,103,441
 980,904
 370,897
Total Liabilities and Shareholders’ Equity 
$2,026,905
 
$2,981,476
 
$3,185,100
 
$2,778,304
The accompanying notes are an integral part of these consolidated financial statements.

F-4




CARRIZO OIL & GAS, INC.
CONSOLIDATED STATEMENTS OF OPERATIONS
(In thousands, except per share data)amounts)
 
 Years Ended December 31, Years Ended December 31,
 2015 2014 2013 2018 2017 2016
Revenues            
Crude oil 
$376,094
 
$610,483
 
$421,311
 
$911,554
 
$633,233
 
$378,073
Natural gas liquids 15,608
 25,050
 15,530
 96,585
 47,405
 22,428
Natural gas 37,501
 74,654
 83,341
 57,803
 65,250
 43,093
Total revenues 429,203
 710,187
 520,182
 1,065,942
 745,888
 443,594
            
Costs and Expenses            
Lease operating 90,052
 74,157
 46,828
 161,596
 139,854
 98,717
Production taxes 17,683
 29,544
 19,811
 50,591
 32,509
 19,046
Ad valorem taxes 9,255
 8,450
 8,701
 10,422
 7,267
 5,559
Depreciation, depletion and amortization 300,035
 317,383
 214,291
 299,530
 262,589
 213,962
General and administrative 67,224
 77,029
 77,492
General and administrative, net 68,617
 66,229
 74,972
(Gain) loss on derivatives, net (99,261) (201,907) 18,417
 (6,709) 59,103
 49,073
Interest expense, net 69,195
 53,171
 54,689
 62,413
 80,870
 79,403
Impairment of oil and gas properties 1,224,367
 
 
Impairment of proved oil and gas properties 
 
 576,540
Loss on extinguishment of debt 38,137
 
 
 9,586
 4,170
 
Loss on sale of oil and gas properties 
 
 45,377
Other (income) expense, net 11,276
 2,150
 (185)
Other expense, net 296
 2,157
 1,796
Total costs and expenses 1,727,963
 359,977
 485,421
 656,342
 654,748
 1,119,068
            
Income (Loss) From Continuing Operations Before Income Taxes (1,298,760) 350,210
 34,761
Income tax (expense) benefit 140,875
 (127,927) (12,903)
Income (Loss) From Continuing Operations 
($1,157,885) 
$222,283
 
$21,858
Income From Discontinued Operations, Net of Income Taxes 2,731
 4,060
 21,825
Income (Loss) Before Income Taxes 409,600
 91,140
 (675,474)
Income tax expense (5,173) (4,030) 
Net Income (Loss) 
($1,155,154) 
$226,343
 
$43,683
 
$404,427
 
$87,110
 
($675,474)
Dividends on preferred stock (18,161) (7,781) 
Accretion on preferred stock (3,057) (862) 
Loss on redemption of preferred stock (7,133) 
 
Net Income (Loss) Attributable to Common Shareholders 
$376,076
 
$78,467
 
($675,474)
            
Net Income (Loss) Per Common Share - Basic      
Income (loss) from continuing operations 
($22.50) 
$4.90
 
$0.54
Income (loss) from discontinued operations, net of income taxes 0.05
 0.09
 0.53
Net income (loss) 
($22.45) 
$4.99
 
$1.07
      
Net Income (Loss) Per Common Share - Diluted      
Income (loss) from continuing operations 
($22.50) 
$4.81
 
$0.53
Income (loss) from discontinued operations, net of income taxes 0.05
 0.09
 0.53
Net income (loss) 
($22.45) 
$4.90
 
$1.06
Net Income (Loss) Attributable to Common Shareholders Per Common Share      
Basic 
$4.40
 
$1.07
 
($11.27)
Diluted 
$4.32
 
$1.06
 
($11.27)
            
Weighted Average Common Shares Outstanding            
Basic 51,457
 45,372
 40,781
 85,509
 73,421
 59,932
Diluted 51,457
 46,194
 41,355
 87,143
 73,993
 59,932
The accompanying notes are an integral part of these consolidated financial statements.

F-5




CARRIZO OIL & GAS, INC.
CONSOLIDATED STATEMENTS OF SHAREHOLDERS’ EQUITY
(In thousands, except share amounts)
  Common Stock Additional
Paid-in
Capital
 Retained Earnings
(Accumulated Deficit)
 Total
Shareholders’
Equity
  Shares Amount   
Balance as of January 1, 2013 40,164,517
 
$402
 
$667,096
 
($82,482) 
$585,016
Stock options exercised for cash 206,501
 2
 1,251
 
 1,253
Stock-based compensation 
 
 19,531
 
 19,531
Restricted stock issuances and vestings, net of forfeitures 552,831
 6
 (539) 
 (533)
Sale of common stock, net of offering costs 4,500,000
 45
 189,641
 
 189,686
Other 44,826
 
 2,968
 
 2,968
Net income 
 
 
 43,683
 43,683
Balance as of December 31, 2013 45,468,675
 
$455
 
$879,948
 
($38,799) 
$841,604
Stock options exercised for cash 33,086
 1
 436
 
 437
Stock-based compensation 
 
 30,280
 
 30,280
Restricted stock issuances and vestings, net of forfeitures 625,301
 5
 (96) 
 (91)
Other 862
 
 4,868
 
 4,868
Net income 
 
 
 226,343
 226,343
Balance as of December 31, 2014 46,127,924
 
$461
 
$915,436
 
$187,544
 
$1,103,441
Stock options exercised for cash 2,433
 
 46
 
 46
Stock-based compensation 
 
 25,707
 
 25,707
Restricted stock issuances and vestings, net of forfeitures 630,723
 6
 (150) 
 (144)
Sale of common stock, net of offering costs 11,500,000
 115
 470,043
 
 470,158
Other 71,913
 1
 (1) 
 
Net loss 
 
 
 (1,155,154) (1,155,154)
Balance as of December 31, 2015 58,332,993
 
$583
 
$1,411,081
 
($967,610) 
$444,054
  Common Stock Additional
Paid-in
Capital
 

Accumulated
Deficit
 Total
Shareholders’
Equity
  Shares Amount   
Balance as of January 1, 2016 58,332,993
 
$583
 
$1,411,081
 
($967,610) 
$444,054
Stock-based compensation expense 
 
 31,194
 
 31,194
Issuance of common stock upon grants of restricted stock awards and vestings of restricted stock units 799,506
 8
 (63) 
 (55)
Sale of common stock, net of offering costs 6,000,000
 60
 223,679
 
 223,739
Net loss 
 
 
 (675,474) (675,474)
Balance as of December 31, 2016 65,132,499
 
$651
 
$1,665,891
 
($1,643,084) 
$23,458
Stock-based compensation expense 
 
 23,625
 
 23,625
Issuance of common stock upon grants of restricted stock awards and vestings of restricted stock units and performance shares 722,122
 8
 (42) 
 (34)
Sale of common stock, net of offering costs 15,600,000
 156
 222,222
 
 222,378
Issuance of warrants 
 
 23,003
 
 23,003
Dividends on preferred stock 
 
 (7,781) 
 (7,781)
Accretion on preferred stock 
 
 (862) 
 (862)
Net income 
 
 
 87,110
 87,110
Balance as of December 31, 2017 81,454,621
 
$815
 
$1,926,056
 
($1,555,974) 
$370,897
Stock-based compensation expense 
 
 20,412
 
 20,412
Issuance of common stock upon grants of restricted stock awards and vestings of restricted stock units and performance shares, net of forfeitures 673,117
 6
 (233) 
 (227)
Sale of common stock, net of offering costs 9,500,000
 95
 213,651
 
 213,746
Dividends on preferred stock 
 
 (18,161) 
 (18,161)
Accretion on preferred stock 
 
 (3,057) 
 (3,057)
Loss on redemption of preferred stock 
 
 (7,133) 
 (7,133)
Net income 
 
 
 404,427
 404,427
Balance as of December 31, 2018 91,627,738
 
$916
 
$2,131,535
 
($1,151,547) 
$980,904
The accompanying notes are an integral part of these consolidated financial statements.

F-6




CARRIZO OIL & GAS, INC.
CONSOLIDATED STATEMENTS OF CASH FLOWS
(In thousands)
 Years Ended December 31, Years Ended December 31,
 2015 2014 2013 2018 2017 2016
Cash Flows From Operating Activities            
Net income (loss) 
($1,155,154) 
$226,343
 
$43,683
 
$404,427
 
$87,110
 
($675,474)
Income from discontinued operations, net of income taxes (2,731) (4,060) (21,825)
Adjustments to reconcile income (loss) from continuing operations to net cash provided by operating activities from continuing operations      
Adjustments to reconcile net income (loss) to net cash provided by operating activities      
Depreciation, depletion and amortization 300,035
 317,383
 214,291
 299,530
 262,589
 213,962
Impairment of oil and gas properties 1,224,367
 
 
Impairment of proved oil and gas properties 
 
 576,540
(Gain) loss on derivatives, net (99,261) (201,907) 18,417
 (6,709) 59,103
 49,073
Cash received (paid) for derivative settlements, net 194,296
 (13,529) 12,491
 (96,307) 7,773
 119,369
Loss on extinguishment of debt 38,137
 
 
 9,586
 4,170
 
Loss on sale of oil and gas properties 
 
 45,377
Stock-based compensation, net 14,729
 25,878
 29,373
Deferred income taxes (140,875) 127,927
 10,934
Stock-based compensation expense, net 13,524
 14,309
 36,086
Deferred income tax expense 4,381
 3,635
 
Non-cash interest expense, net 4,289
 4,272
 3,932
 2,567
 3,657
 4,172
Other, net 5,709
 2,379
 3,704
 4,216
 2,337
 3,753
Changes in operating assets and liabilities-      
Changes in components of working capital and other assets and liabilities-      
Accounts receivable 29,781
 (1,334) 11,557
 24,008
 (41,630) (12,836)
Accounts payable (12,617) 27,238
 13,595
 16,013
 11,822
 (30,130)
Accrued liabilities (17,517) (3,096) (12,588) (19,154) 11,512
 (7,938)
Other, net (4,453) (5,219) (5,467)
Net cash provided by operating activities from continuing operations 378,735
 502,275
 367,474
Net cash used in operating activities from discontinued operations (1,368) (656) (623)
Other assets and liabilities, net (2,527) (3,406) (3,809)
Net cash provided by operating activities 377,367
 501,619
 366,851
 653,555
 422,981
 272,768
Cash Flows From Investing Activities            
Capital expenditures - oil and gas properties (674,612) (860,604) (786,976)
Capital expenditures - other property and equipment (1,340) (750) (968)
Capital expenditures (968,828) (654,711) (480,929)
Acquisitions of oil and gas properties (1,817) (92,961) 
 (204,854) (695,774) (153,521)
Proceeds from sales of oil and gas properties, net 8,047
 12,576
 238,470
Proceeds from divestitures of oil and gas properties 381,434
 197,564
 15,564
Other, net (3,654) 1,063
 39,589
 (3,720) (6,531) (946)
Net cash used in investing activities from continuing operations (673,376) (940,676) (509,885)
Net cash provided by (used in) investing activities from discontinued operations (2,678) (7,834) 124,533
Net cash used in investing activities (676,054) (948,510) (385,352) (795,968) (1,159,452) (619,832)
Cash Flows From Financing Activities            
Issuance of senior notes 650,000
 301,500
 
Tender and redemption of senior notes (626,681) 
 (69,325)
Payment of deferred purchase payment (150,000) 
 
Issuance of senior notes, net of issuance costs 
 245,418
 
Redemptions of senior notes and other long-term debt (460,540) (152,813) 
Redemption of preferred stock (50,030) 
 
Borrowings under credit agreement 1,126,860
 986,041
 582,000
 3,309,400
 1,992,523
 770,291
Repayments of borrowings under credit agreement (1,126,860) (986,041) (582,000) (2,856,269) (1,788,223) (683,291)
Payments of debt issuance costs (12,420) (6,510) (3,257)
Payments of credit facility amendment fees (1,674) (4,469) (1,330)
Sale of common stock, net of offering costs 470,158
 
 189,686
 213,746
 222,378
 223,739
Excess tax benefits from stock-based compensation 
 4,863
 1,969
Proceeds from stock options exercised 46
 437
 1,253
Sale of preferred stock, net of issuance costs 
 236,404
 
Payments of dividends on preferred stock (18,161) (7,781) 
Other, net (336) 
 
 (1,317) (1,620) (1,069)
Net cash provided by financing activities from continuing operations 330,767
 300,290
 120,326
Net cash provided by financing activities from discontinued operations 
 
 3,000
Net cash provided by financing activities 330,767
 300,290
 123,326
 135,155
 741,817
 308,340
Net Increase (Decrease) in Cash and Cash Equivalents 32,080
 (146,601) 104,825
 (7,258) 5,346
 (38,724)
Cash and Cash Equivalents, Beginning of Year 10,838
 157,439
 52,614
 9,540
 4,194
 42,918
Cash and Cash Equivalents, End of Year 
$42,918
 
$10,838
 
$157,439
 
$2,282
 
$9,540
 
$4,194
The accompanying notes are an integral part of these consolidated financial statements.

F-7




CARRIZO OIL & GAS, INC.
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
1. Nature of Operations
Carrizo Oil & Gas, Inc. is a Houston-based energy company which, together with its subsidiaries (collectively, the “Company”), is actively engaged in the exploration, development, and production of crude oil, NGLs, and natural gas primarily from resource plays located in the United States. The Company’s current operations are principally focused in proven, producing oil and gas plays primarily in the Eagle Ford Shale in South Texas and the DelawarePermian Basin in West Texas, the Utica Shale in Ohio, the Niobrara Formation in Colorado and the Marcellus Shale in Pennsylvania.Texas.
2. Summary of Significant Accounting Policies
Basis of Presentation and Principles of Consolidation
The consolidated financial statements include the accounts of the Company after elimination of intercompany transactions and balances and are presented in accordance with U.S. generally accepted accounting principles (“GAAP”). The Company proportionately consolidates its undivided interests in oil and gas properties as well as investments in unincorporated entities, such as partnerships and limited liability companies where the Company, as a partner or member, has undivided interests in the oil and gas properties. Certain reclassifications have been made to prior period amounts to conform to the current period presentation. Such reclassifications had no material impact on prior period amounts.
Discontinued Operations
On February 22, 2013, the Company closed on the sale of Carrizo UK Huntington Ltd, a wholly owned subsidiary of the Company (“Carrizo UK”), and all of its interest in the Huntington Field discovery, including a 15% non-operated working interest and certain overriding royalty interests, to a subsidiary of Iona Energy Inc. (“Iona Energy”) for an agreed-upon price of $184.0 million, including the assumption and repayment by Iona Energy of the $55.0 million of borrowings outstanding under Carrizo UK’s senior secured multicurrency credit facility as of the closing date. The liabilities, results of operations and cash flows associated with Carrizo UK have been classified as discontinued operations in the consolidated financial statements. Unless otherwise indicated, the information in these notes relate to the Company’s continuing operations. Information related to discontinued operations is included in “Note 3. Discontinued Operations”, “Note 15. Condensed Consolidating Financial Information” and “Note 18. Supplemental Disclosures about Oil and Gas Producing Activities (Unaudited).”
Use of Estimates
The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the periods reported. Certain of such estimates and assumptions are inherently unpredictable and will differ from actual results. The Company evaluates subsequent events through the date the financial statements are issued.
Significant estimates include volumes of proved oil and gas reserves, which are used in calculating depreciation, depletion and amortization (“DD&A”) of proved oil and gas property costs, the present value of estimated future net revenues included in the full cost ceiling test, estimates of future taxable income used in assessing the realizability of deferred tax assets, and the estimated costs and timing of cash outflows underlying asset retirement obligations. Oil and gas reserve estimates, and therefore calculations based on such reserve estimates, are subject to numerous inherent uncertainties, the accuracy of which, is a function of the quality and quantity of available data, the application of engineering and geological interpretation and judgment to available data and the interpretation of mineral leaseholds and other contractual arrangements, including adequacy of title and drilling requirements and royalty obligations.requirements. These estimates also depend on assumptions regarding quantities and production rates of recoverable oil and gas reserves, oil and gas prices, timing and amounts of development costs and operating expenses, all of which will vary from those assumed in the Company’s estimates. Other significant estimates are involved in determining acquisition date fair values of assets acquired and liabilities assumed, impairments of unevaluated leasehold costs, fair values of commodity derivative assets and liabilities, fair values of contingent consideration arrangements, fair value of preferred stock upon issuance, grant date fair value of stock-based compensation, collectability of receivables,awards, and in evaluating disputed claims, interpreting contractual arrangements (including royalty obligations and notional interest calculations) and contingencies. Estimates are based on current assumptions that may be materially affected by the results of subsequent drilling and completion, testing and production as well as subsequent changes in oil and gas prices, counterparty creditworthiness, interest rates and the market value and volatility of the Company’s common stock.

F-8



Cash and Cash Equivalents
Cash equivalents include highly liquid investments with original maturities of three months or less. Certain of the Company’s cash accounts are zero-balance controlled disbursement accounts that do not have the right of offset against the Company’s other cash balances. The Company presents the outstanding checks written against these zero-balance accounts have been classified as a component of accounts payable in the consolidated balance sheets and totaled $49.1$70.4 million and $70.5$62.6 million as of December 31, 20152018 and 2014,2017, respectively.
Accounts Receivable
The Company’s accounts receivable consist primarily of receivables from crude oil, NGL, and natural gas purchasers and joint interest owners in properties the Company operates. The Company generally has the right to withhold future revenue distributions to recover past due receivables from joint interest owners. Generally, the Company’s receivables from the sale of crude oil are collected within one month and receivables from the sale of NGL and natural gas are collected within two months. The Company establishes an allowance for doubtful accounts when it determines it is probable that it will not collect all or a part of an accounts receivable balance. The Company assesses the collectability of its accounts receivable on a quarterly basis and adjusts the allowance as necessary using the specific identification method. As of December 31, 2015 and 2014, theThe Company’s allowance for doubtful accounts and bad debt expense was $1.0 million and zero, respectively.immaterial for all periods presented.


Concentration of Credit Risk and Major Customers
The Company’s accounts receivable consists primarily of receivables from oil and gas purchasers and joint interest owners in properties the Company operates. This concentration of accounts receivable from customers and joint interest ownersentities in the oil and gas industry may impact the Company’s overall credit risk insuch that these entities may be similarly affected by changes in economic and other industry conditions. The Company generally does not require collateral from its customers andpurchasers or joint interest owners.
The Company generally hasdoes not believe the rightloss of any one of its purchasers would materially affect its ability to withhold future revenue distributions to recover any non-payment of joint interest billings.
The Company’s derivative instruments in a net asset position also subjectsell the Company to a concentration of credit risk. See “Note 13. Derivative Instruments.”
Major Customers
Shell Trading (US) Company accounted for approximately 65%, 44%, and 47% of the Company’s oil and gas it produces as other purchasers are available in its primary areas of activity. The Company had the following major customers that represented 10% or more of its total revenues in 2015, 2014, and 2013, respectively. Flint Hills Resources, LP accounted for approximately 26% and 23%at least one of the periods presented:
 Years Ended December 31,
 2018 2017 2016
Shell Trading (US) Company73% 69% 56%
Flint Hills Resources, LP* * 15%
* - Less than 10% for the respective year.
The Company’s oilcounterparties to its commodity derivative instruments include lenders under the Company’s credit agreement (“Lender Counterparty”) as well as counterparties who are not lenders under the Company’s credit agreement (“Non-Lender Counterparty”). As each Lender Counterparty has an investment grade credit rating and gas revenues in 2014the Company has obtained a guaranty from each Non-Lender Counterparty’s parent company which has an investment grade credit rating, the Company believes it does not have significant credit risk with its commodity derivative instrument counterparties. Although the Company does not currently anticipate nonperformance from its counterparties, it continually monitors the credit ratings of each Lender Counterparty and 2013, respectively.each Non-Lender Counterparty’s parent company. The Company executes its derivative instruments with seventeen counterparties to minimize its credit exposure to any individual counterparty.
Oil and Gas Properties
Oil and gas properties are accounted for using the full cost method of accounting under which all productive and nonproductive costs directly associated with property acquisition, exploration and development activities are capitalized to cost centers established on a country-by-country basis. The internal cost of employee compensation and benefits, including stock-based compensation, directly associated with acquisition, exploration and development activities are capitalized to either proved or unproved oil and totaled $15.8 million, $18.8 million and $15.0 million forgas properties based on the years ended December 31, 2015, 2014 and 2013, respectively.type of activity. Internal costs related to production, general corporate overhead and similar activities are expensed as incurred.
Capitalized oil and gas property costs within a cost center are amortized on an equivalent unit-of-production method, converting natural gas to barrels of oil equivalent at the ratio of six thousand cubic feet of gas to one barrel of oil, which represents their approximate relative energy content. The equivalent unit-of-production amortization rate is computed on a quarterly basis by dividing current quarter production by proved oil and gas reserves at the beginning of the quarter then applying such amortization rate to capitalizedproved oil and gas property costs, which includes estimated asset retirement costs, less accumulated amortization, plus the estimated future expenditures (based on current costs) to be incurred in developing proved reserves, net of estimated salvage values. Average DD&A per Boe of proved oil and gas properties was $22.05, $26.20 and $21.38 for the years ended December 31, 2015, 2014 and 2013, respectively.
Unproved properties, not being amortized, include unevaluated leasehold and seismic costs associated with specific unevaluated properties the cost of exploratory wells in progress, and related capitalized interest. Exploratory wells in progress and individuallyIndividually significant unevaluated leaseholds are assessed on a quarterly basis to determine whether or not and to what extent proved reserves have been assigned to the properties or if an impairment has occurred, in which case the related costs along with associated capitalized interest are addedreclassified to theproved oil and gas property costs subject to amortization.properties. Factors the Company considers in its impairment assessment include drilling results by the Company and other operators, the terms of oil and gas leases not held by production and drilling, completion, and completioninfrastructure capital expenditure plans. The Company expectsIndividually insignificant unevaluated leaseholds are grouped by major area and added to complete its evaluationproved oil and gas properties based on the average primary lease term of the majority of its unevaluated leaseholds within the next five years and exploratory wells in progress within the next year.properties. Geological and geophysical costs not associated with specific prospects are recorded to proved oil and gas property costs subject to amortization immediately. The Company capitalized interest costs associated with its unproved properties totaling $32.1 million, $34.5 million and $29.9 million for the years ended December 31, 2015, 2014 and 2013, respectively.as incurred. The amount of interest costs capitalized is determined on a quarterly basis based on the average balance of unproved properties using aand the weighted average interest rate based onof outstanding borrowings.

F-9



Capitalized costs,At the end of each quarter, the net book value of oil and gas properties, less accumulated amortization and related deferred income taxes, are limited to the “cost center ceiling” equal to (i) the sum of (A)(a) the present value of estimated future net revenues from proved oil and gas reserves, less estimated future expenditures to be incurred in developing and producing the proved reserves computed using a discount factor of 10%, (B)(b) the costs of unproved properties not being amortized, and (C)(c) the lower of cost or estimated fair value of unproved properties included in the costs being amortized; less (ii) related income tax effects. IfAny excess of the net capitalized costs exceedbook value of oil and gas properties, less related deferred income taxes, over the cost center ceiling the excess is recognized as an impairment of proved oil and gas properties. An impairment recognized in one period may not be reversed in a subsequent period even if higher oil and gas commodity


prices in the future increase theresult in a cost center ceiling applicable toin excess of the subsequent period.net book value of oil and gas properties, less related deferred income taxes.
The estimated future net revenues used in the cost center ceiling are calculated using the average realized prices for sales of crude oil, NGLs and natural gas on the first calendar day of each month during the preceding 12-month period prior to the end of the current reporting period. Prices arequarter (“12-Month Average Realized Price”), held constant indefinitely and are not changedflat for the life of the production, except where different prices are fixed and determinable from applicable contracts for the remaining term of those contracts. Prices do not include the impact of commodity derivative instruments becauseas the Company elected not to meet the criteria to qualify its commodity derivative instruments for hedge accounting treatment.
During 2015, the Company recorded after-tax impairments in the carrying value of proved oil and gas properties of $795.8 million ($1,224.4 million pre-tax) due primarily to declines in the average realized prices for sales of oil on the first calendar day of each month during the trailing 12-month period. There were no impairments of proved oil and gas properties for the years ending December 31, 2014 and 2013. See “Note 5. Property and Equipment, Net” for further details of the impairment.
Proceeds from the sale of proved and unproved oil and gas properties are recognized as a reduction of capitalizedproved oil and gas property costs with no gain or loss recognized, unless the sale significantly alters the relationship between capitalized costs and proved reserves of oil and gas attributable to a cost center. For 2015the years ended December 31, 2018, 2017 and 20142016, the Company did not have any sales of oil and gas properties that significantly altered such relationship. On February 22, 2013, the Company closed the sale of Carrizo UK, which included all of the Company’s proved reserves in its U.K. cost center. As a result, in the first quarter of 2013, the Company recognized a $37.3 million pre-tax gain in “Net income from discontinued operations, net of income taxes” in the consolidated statements of operations. Further, on October 31, 2013, the Company closed the sale of its remaining oil and gas properties in the Barnett. The proved reserves attributable to the Barnett sale represented 40% of the Company’s proved reserves as of October 31, 2013, which significantly altered the relationship between capitalized costs and proved reserves of oil and gas attributable to the Company’s U.S. cost center. As a result, the Company recognized a pre-tax loss on the sale of $45.4 million in “Loss on sale of oil and gas properties” in the consolidated statements of operations in the fourth quarter of 2013.
Depreciation of other property and equipment is recognized using the straight-line method based on estimated useful lives ranging from three to ten years.
Debt Issuance Costs
Debt issuance costs associated with the revolving credit facility are classified in “Other long-term assets” in the consolidated balance sheets and are amortized to interest expense on a straight-line basis over the term of the facility. Debt issuance costs associated with the senior notes are classified as a reduction of the related long-term debt in the consolidated balance sheets and are amortized to interest expense using the effective interest method over the terms of the related senior notes.
Financial Instruments
The Company’s financial instruments consist of cash and cash equivalents, receivables, payables, commodity derivative assets and liabilities, contingent consideration arrangements determined to be embedded derivatives and long-term debt. The carrying amounts of cash and cash equivalents, receivables and payables approximate fair value due to the highly liquid or short-term nature of these instruments. The fair values of the Company’sCompany��s commodity derivative assets and liabilities are based on a third-party industry-standard pricing model using contract terms and prices and assumptions and inputs that uses market data obtained from third-party sources,are substantially observable in active markets throughout the full term of the instruments, including quoted forward prices for oil and gas price curves, discount rates, volatility factors and credit risk adjustments. The fair values of the Company’s contingent consideration arrangements are determined by a third-party valuation specialist using Monte Carlo simulations including significant inputs such as future commodity prices, volatility factors. factors for the future commodity prices and a risk adjusted discount rate.
The carrying amountsamount of long-term debt associated with borrowings outstanding under the Company’s revolving credit facility approximateapproximates fair value as borrowings bear interest at variable rates of interest.rates. The carrying amounts of the Company’s senior notes and other long-term debt may not approximate fair value because carrying amounts are net of any unamortized premium or discountpremiums and debt issuance costs, and the senior notes and other long-term debt bear interest at fixed rates of interest.rates. See “Note 7.6. Long-Term Debt” and “Note 14.13. Fair Value Measurements.”Measurements” for additional discussion.
Asset Retirement Obligations
The Company’s asset retirement obligations represent the present value of the estimated future costs associated with plugging and abandoning oil and gas wells, removing production equipment and facilities and restoring the surface of the land in accordance with the terms of oil and gas leases and applicable local, state and federal laws. Determining asset retirement obligations requires estimates of the costs of plugging and abandoning oil and gas wells, removing production equipment and facilities and restoring the surface of the land as well as estimates of the economic lives of the oil and gas wells and future inflation rates. The resulting estimate of future cash outflows are discounted using a credit-adjusted risk-free interest rate that corresponds with the timing of the cash outflows. Cost estimates consider historical experience, third party estimates, the requirements of oil and gas leases and

F-10



applicable local, state and federal laws, but do not consider estimated salvage values. Asset retirement obligations are recognized when the well is drilled or acquired or when the production equipment and facilities are installed or acquired with an associated increase in proved oil and gas property costs. Asset retirement obligations are accreted each period through DD&A to their expected settlement values with any difference between the actual cost of settling the asset retirement obligations and recorded amount being recognized as an adjustment to proved oil and gas property costs. Cash paid to settle asset retirement obligations is included in net cash provided by operating activities in the consolidated statements of cash flows. On a quarterly basis, when indicators suggest there have been material changes in the estimates underlying the obligation, the Company reassesses its asset retirement obligations to determine whether any revisions to the obligations are necessary. At least annually, the Company reassesses all of its asset retirement obligations to determine whether any revisions to the obligations are necessary. Revisions typically occur due to changes in estimated costs or well economic lives of the oil and gas wells, or if federal or state regulators enact new requirements regarding plugging and abandoning oil and gas wells. See “Note 8.7. Asset Retirement Obligations.”Obligations” for additional discussion.


Commitments and Contingencies
Liabilities are recognized for contingencies when (i) it is both probable that an asset has been impaired or that a liability has been incurred and (ii) the amount of such loss is reasonably estimable. See “Note 9.8. Commitments and Contingencies.”Contingencies” for additional discussion.
Revenue Recognition
OilThe Company’s revenues are comprised solely of revenues from customers and include the sale of crude oil, NGLs, and natural gas. The Company believes that the disaggregation of revenue into these three major product types appropriately depicts how the nature, amount, timing and uncertainty of revenue and cash flows are affected by economic factors based on its single geographic location. Crude oil, NGL, and natural gas revenues are recognized at a point in time when production is sold to a purchaser at a fixed or determinable price, delivery has occurred, titlecontrol has transferred and collectability of the revenue is probable. The transaction price used to recognize revenue is a function of the contract billing terms. Revenue is invoiced by calendar month based on volumes at contractually based rates with payment typically required within 30 days of the end of the production month. At the end of each month when the performance obligation is satisfied, the variable consideration can be reasonably assured.estimated and amounts due from customers are accrued in “Accounts receivable, net” in the consolidated balance sheets. As of December 31, 2018 and December 31, 2017, receivables from contracts with customers were $77.1 million and $85.6 million, respectively. Taxes assessed by governmental authorities on crude oil, NGL, and natural gas sales are presented separately from such revenues in the consolidated statements of operations.
Crude oil sales. Crude oil production is primarily sold at the wellhead at an agreed upon index price, net of pricing differentials. Revenue is recognized when control transfers to the purchaser at the wellhead, net of transportation costs incurred by the purchaser.
Natural gas and NGL sales. Natural gas is delivered to a midstream processing entity at the wellhead or the inlet of the midstream processing entity’s system. The midstream processing entity gathers and processes the natural gas and remits proceeds for the resulting sales of NGLs and residue gas. The Company followsevaluates whether it is the sales methodprincipal or agent in the transaction and has concluded it is the principal and the purchasers of accounting whereby revenues from the productionNGLs and residue gas are the customers. Revenue is recognized on a gross basis, with gathering, processing and transportation fees recognized as lease operating expense in the consolidated statements of natural gas from properties in whichoperations as the Company has an interest with other producers are recognized for production soldmaintains control throughout processing.
Transaction Price Allocated to purchasers, regardlessRemaining Performance Obligations. The Company applied the practical expedient in ASC 606 exempting the disclosure of whether the sales are proportionatetransaction price allocated to remaining performance obligations if the Company’s ownership interest in the property. Production imbalances are recognized as an asset or liabilityvariable consideration is allocated entirely to the extent that the Company has an imbalance on a specific property that is in excesswholly unsatisfied performance obligation. Each unit of its remaining proved reserves. Salesproduct typically represents a separate performance obligation, therefore, future volumes are wholly unsatisfied and disclosure of the transaction price allocated to remaining performance obligations is not significantly different from the Company’s share of production and as of December 31, 2015 and 2014, the Company did not have any material production imbalances.required.
Derivative Instruments
The Company uses commodity derivative instruments to reduce its exposure tomitigate the effects of commodity price volatility for a substantial, but varying, portion of its forecasted crude oil and natural gassales of production and thereby achieve a more predictable level of cash flows to support the Company’s drilling and completion capital expenditure program.flow. All commodity derivative instruments are recorded onin the consolidated balance sheets as either an asset or liability measured at fair value. The Company nets its commodity derivative instrument fair value amounts executed with the same counterparty, along with any deferred premium obligations, to a single asset or liability pursuant to ISDA master agreements,International Swap Dealers Association Master Agreements (“ISDAs”), which provide for net settlement over the term of the contract and in the event of default or termination of the contract. AsThe Company does not enter into commodity derivative instruments for speculative purposes.
The Company has entered into agreements for acquisitions or divestitures of oil and gas properties that include obligations to pay the seller or rights to receive from the buyer, respectively, additional consideration if commodity prices exceed specified thresholds during certain periods in the future. These contingent consideration assets and liabilities are required to be bifurcated and accounted for separately as derivative instruments as they are not considered to be clearly and closely related to the host contract, and recognized at their acquisition or divestiture date fair value in the consolidated balance sheets.
The Company has elected not to meet the criteria to qualify its commodity derivative instruments for hedge accounting treatment,treatment. Therefore, all gains and losses as a result of changes in the fair value of commodity derivative instruments, as well as its contingent consideration arrangements, are recognized as (gain)“(Gain) loss on derivatives, netnet” in the consolidated statements of operations in the period in which the changes occur. The netDeferred premium obligations associated with the Company’s commodity derivative instruments are recognized as “(Gain) loss on derivatives, net” in the consolidated statements of operations in the period in which the deferred premium obligations are incurred.
Cash flows are impacted to the extent that settlements of commodity derivative instruments, including deferred premium obligations, and contingent consideration arrangements result in cash flows resulting fromreceived or paid during the payments toperiod and receipts from counterpartiesare recognized as a result“Cash received (paid) for derivative settlements, net” in the consolidated statements of derivative settlementscash flows. Cash received or paid in


settlement of contingent consideration assets or liabilities, respectively, are classified as cash flows from financing activities up to the divestiture or acquisition date fair value with any excess classified as cash flows from operating activities. The Company does not enter into derivative instruments for speculative or trading purposes.
The Company’s Board of Directors establishes risk management policies and, on a quarterly basis, reviews its commodity derivative instruments, including volumes, types of instruments and counterparties. These policies require that commodity derivative instruments be executed only by the President or Chief Financial Officer after consultation with and concurrence by the President, Chief Financial Officer and Chairman of the Board. See “Note 13.12. Derivative Instruments” for additional discussion.
Preferred Stock and Common Stock Warrants
The Company applies the accounting standards for distinguishing liabilities from equity when determining the classification and measurement of preferred stock. Preferred stock that is not mandatorily redeemable is excluded from liability classification and is evaluated for classification in shareholders’ equity or temporary equity. As the number of common shares that could be delivered upon the holders’ optional redemption is indeterminate, the Company cannot assert that it will be able to settle in shares of its common stock and, as a result, presents preferred stock as temporary equity. On a quarterly basis, the Company reassesses the presentation of preferred stock in the consolidated balance sheets.
When preferred stock is issued with common stock warrants, the common stock warrants are evaluated separately to determine if they are a freestanding financial instrument to determine whether they must be recorded as a derivative instrument. The Company further discussionevaluates the common stock warrants for equity classification and has determined they qualify for equity classification and, therefore, are presented in additional paid-in capital in the consolidated balance sheets. The preferred stock and common stock warrants are recorded based on the net proceeds received allocated to the two instrument’s relative fair values. The preferred stock is subject to accretion from its relative fair value at the issuance date to the redemption value using the effective interest method. The common stock warrants do not require further adjustments from their relative fair value at the issuance date.
Dividends and accretion associated with preferred stock are presented in the consolidated statements of operations as reductions to net income, or increases of net loss, to derive net income (loss) attributable to common shareholders. Dividend payments are presented as a financing activity in the consolidated statement of cash flows.
See “Note 9. Preferred Stock and Common Stock Warrants” for further details of the Company’s derivative instruments.outstanding preferred stock and common stock warrants.
Stock-Based Compensation
The Company recognized stock-based compensation expense, net of amounts capitalized to oil and gas properties associated with restricted stock awards and units, stock appreciation rights to be settled in cash (“Cash SARs”), and performance share awards, which is reflectedrecognized as general“General and administrative expense, net” in the consolidated statements of operations. The Company accounts for forfeitures of equity-based incentive awards as they occur. See “Note 11. Stock-Based Compensation” for further details of the awards discussed below.
Restricted Stock Awards and Units. Stock-based compensation expense is based on the price of the Company’s common stock on the grant date and recognized over the vesting period (generally one to three years) using the straight-line method, except for awards or units with performance conditions, in which case the Company uses the graded vesting method. For restricted stock awards and units granted to independent contractors, stock-based compensation expense is based on the fair value remeasured at each reporting period and recognized over the vesting period (generally three years) using the straight-line method, except for awards or units with performance conditions, in which case the Company uses the graded vesting method.
Stock Appreciation Rights. For Cash SARs, stock-based compensation expense is initially based on the grant date fair value determined using a Black-Scholes-Merton option pricing model, with the fair value liability (using the Black-Scholes-Merton option pricing model)subsequently remeasured at the end of each reporting period and recognized over the vesting period (generally two or three years) using the straight-line method, except for Cash SARs with performance conditions, in which case the Company uses the graded vesting method. Each award includes a performance condition that must be met in order for that award to vest. For periods subsequent to vesting and prior to exercise, stock-based compensation expense is based on the fair value liability

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remeasured at the end of each reporting period based on the intrinsic value of the Cash SAR. The liability for Cash SARs is classified as “Other current liabilities” for the portion of the fair value liability attributable to awards that are vested or are expected to vest within the next 12 months, with the remainder classified as “Other long-term liabilities” in the consolidated balance sheets. Cash SARs typically expire between fourfive and seven years after the date of grant. If Cash SARs expire unexercised, the cumulative compensation costs associated with such Cash SARs will be zero.
Performance Share Awards.Shares. For performance share awards,shares, stock-based compensation expense is based on the grant date fair value (determineddetermined using a Monte Carlo valuation model prepared by an independent third party) and recognized over thean approximate three year vesting period (generally three years) using the straight-line method. Each award includes a performance condition that must be met in order for that awardshare represents the right to vest.
The number of sharesreceive one share of common stock, issuable upon vestinghowever, the number of performance shares that vest ranges from zero to 200% of the number oftarget performance share awardsshares granted based on the Company’s total shareholder return (“TSR”) of the Company’s common stock relative to anthe TSR achieved by a specified industry peer group generally over aan approximate three year performance period.period, the last day of which is also the vesting date. Compensation costs related to the performance share awardsshares will be


recognized if the requisite service period is fulfilled and the performance condition is met, even if the market condition is not achieved. See “Note 10. Shareholders’ Equity and Stock Incentive Plans.”
Assumptions. The Black-Scholes-Merton option pricing model and the Monte Carlo valuation model require the Company to make the following assumptions:
The risk-free interest rate is based on the zero-coupon United States Treasury yield for the expected term at date of grant.
The dividend yield on the Company’s common stock is assumed to be zero since the Company does not pay dividends and has no current plans to do so in the future.
The volatility of the Company’s common stock is based on daily, historical volatility of the market price of the Company’s common stock over a period of time equal to the expected term and ending on the grant date. For the Monte Carlo valuation model, daily, historical volatility for the industry peer group for the same time period as the Company is also used.
For the Black-Scholes-Merton option pricing model, the expected term is based on historical exercises for various groups of employees and independent contractors, while the Monte Carlo valuation model uses an expected term based on the performance period for the award.
Income Taxes
Income taxes are recognized based on earnings reported for tax return purposes in addition to a provision for deferred income taxes. Deferred income taxes are recognized at the end of each reporting period for the future tax consequences of cumulative temporary differences between the tax basesbasis of assets and liabilities and their reported amounts in the Company’s consolidated financial statements based on existing tax laws and enacted statutory tax rates applicable to the periods in which the temporary differences are expected to affect taxable income. The Company routinely assesses the realizability of its deferred tax assets on a quarterly basis by taxing jurisdictionconsidering all available evidence (both positive and considers its estimate of future taxable income based on production of proved reserves at estimated future pricing in making such assessments. If the Company concludes thatnegative) to determine whether it is more likely than not that someall or a portion or all of the benefit from deferred tax assets will not be realized and a valuation allowance is required. In making this assessment, the Company evaluates possible sources of taxable income that may be available to realize the deferred tax assets, are reduced by a valuation allowance. Asincluding projected future taxable income, the reversal of December 31, 2015, the Company recorded a valuation allowance against the net deferredexisting temporary differences, taxable income in carryback years and available tax asset of $324.7 million, reducing the net deferred tax asset to zero.planning strategies. See “Note 6.5. Income Taxes” for further discussion of the deferred tax assets valuation allowance. The Company classifies interest and penalties associated with income taxes as interest expense. The Company applies the tax law ordering approach to determine the sequence in which deferred tax assets and other tax attributes are utilized.
Recent Accounting PronouncementsNet Income (Loss) Attributable to Common Shareholders Per Common Share
In November, 2015, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update No. 2015-17, Balance Sheet Classification of Deferred Taxes. Update 2015 (“Update 2015-17”). Updated 2015-17 eliminates the current requirementBasic net income (loss) attributable to present deferred tax assets and liabilities as current and noncurrentcommon shareholders per common share is based on the consolidated balance sheets. Instead all deferred tax assets and liabilities will be presented as noncurrent. For public entities, Update 2015-17weighted average number of shares of common stock outstanding during the year. Diluted net income (loss) attributable to common shareholders per common share is effective for fiscal years, and interim periods within those fiscal years, beginning after December 31, 2016 and may be applied prospectively to all deferred tax assets and liabilities or retrospectively to all periods presented with early adoption permitted. The adoption of Update 2015-17 is not expected to have a significant impactbased on the Company's consolidated financial statements, other than balance sheet reclassifications.
In April 2015,weighted average number of common shares and all potentially dilutive common shares outstanding during the FASB issued Accounting Standards Update No. 2015-03, Simplifyingyear which include restricted stock awards and units, performance shares, and common stock warrants. The Company includes the Presentationnumber of Debt Issuance Costs (“Update 2015-03”). The objective of Update 2015-03 is to simplify the presentation of debt issuance costs in financial statements by presenting such costsrestricted stock awards and units and common stock warrants in the balance sheetcalculation of diluted weighted average shares outstanding when the grant date or exercise prices are less than the average market prices of the Company’s common stock for the period. The Company includes the number of performance shares in the calculation of diluted weighted average common shares outstanding based on the number of shares, if any, that would be issuable as if the end of the period was the end of the performance period. The Company has excluded any impact of the preferred stock to the calculation of diluted weighted average common shares outstanding as it has the positive intent and ability to redeem the preferred stock in cash. When a direct deductionloss attributable to common shareholders exists, all potentially dilutive common shares outstanding are anti-dilutive and therefore excluded from the related debt rather thancalculation of diluted weighted average shares outstanding.
The following table summarizes the calculation of net income (loss) attributable to common shareholders per common share:
  Years Ended December 31,
  2018 2017 2016
  (In thousands, except per share amounts)
Net Income (Loss) 
$404,427
 
$87,110
 
($675,474)
Dividends on preferred stock (18,161) (7,781) 
Accretion on preferred stock (3,057) (862) 
Loss on redemption of preferred stock (7,133) 
 
Net Income (Loss) Attributable to Common Shareholders 
$376,076
 
$78,467
 
($675,474)
       
Basic weighted average common shares outstanding 85,509
 73,421
 59,932
Dilutive effect of restricted stock and performance shares 949
 269
 
Dilutive effect of common stock warrants 685
 303
 
Diluted weighted average common shares outstanding 87,143
 73,993
 59,932
       
Net Income (Loss) Attributable to Common Shareholders Per Common Share      
Basic 
$4.40
 
$1.07
 
($11.27)
Diluted 
$4.32
 
$1.06
 
($11.27)


The computation of diluted net income attributable to common shareholders per common share excluded certain restricted stock and performance shares as an asset. In August 2015, the FASB issued Accounting Standards Update No. 2015-15, Interest-Imputationimpacts were anti-dilutive. The following table presents the weighted average anti-dilutive securities for the periods presented:
  Years Ended December 31,
  2018 2017 2016
  (In thousands)
Anti-dilutive restricted stock and performance shares 19
 52
 669
Industry Segment and Geographic Information
The Company operates in only one industry segment, which is the exploration, development, and production of Interest (Subtopic 835-30) (“Update 2015-15”), which addressescrude oil, NGLs, and natural gas. All of the presentation or subsequent measurement of debt issuance costs related to line-of-credit arrangements, given the absence of authoritative guidance within Update 2015-03 for debt issuance costs related to line-of-credit arrangements. Under Update 2015-15, debt issuance costs associated with line-of-credit agreements may be deferred and presented as an assetCompany’s operations are located in the balance sheet, subsequently amortizingUnited States and currently all revenues are attributable to customers located in the deferred debt issuance costs ratably overUnited States.
Recently Adopted Accounting Standards
Revenue From Contracts with Customers. Effective January 1, 2018, the term of the line-of-credit arrangement,

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regardless of whether there are any outstanding borrowings. For public entities, Update 2015-03 and Update 2015-15 are effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2015 and applied retrospectively with early adoption permitted. The adoption of Update 2015-03 and Update 2015-15 will not have an impact on the Company’s consolidated financial statements, other than balance sheet reclassifications.
In May 2014, the FASB issued Accounting Standards UpdateCompany adopted ASU No. 2014-09, Revenue fromFrom Contracts withWith Customers (Topic 606) (“Update 2014-09”ASC 606”), which using the modified retrospective method and has applied the standard to all existing contracts. ASC 606 supersedes theprevious revenue recognition requirements in TopicASC 605 - Revenue Recognition (“ASC 605”) and industry specific guidance in Subtopic 932-605, Extractive Activities- Oil and Gas- Revenue Recognition. Update 2014-09 requires entitiesincludes a five-step revenue recognition model to recognize revenue when it transfers promiseddepict the transfer of goods or services to customers in an amount that reflects the consideration the entity expects to be entitled to in exchange for those goods or services. As a result of adopting ASC 606, the Company did not have a cumulative-effect adjustment in retained earnings. The comparative information for the years ended December 31, 2017 and services. In April 2015,2016 has not been recast and continues to be reported under the FASB proposedaccounting standards in effect for that period. Additionally, adoption of ASC 606 did not impact net income attributable to delay the effective date one year. This proposal was approved in July 2015 and as such, Update 2014-09 is effective for annual reporting periods beginning after December 15, 2017, including interim periods within that reporting period for public entities. common shareholders.
The Company is currently evaluatingtables below summarize the impact of adoption for the adoptionyear ended December 31, 2018:
  Year Ended December 31, 2018
  Under ASC 606 Under ASC 605 Increase % Increase
  (In thousands)  
Revenues        
Crude oil 
$911,554
 
$910,975
 
$579
 0.1%
Natural gas liquids 96,585
 91,608
 4,977
 5.4%
Natural gas 57,803
 55,023
 2,780
 5.1%
Total revenues 1,065,942
 1,057,606
 8,336
 0.8%
         
Costs and Expenses        
Lease operating 161,596
 153,260
 8,336
 5.4%
         
Income Before Income Taxes 
$409,600
 
$409,600
 
$—
 %
Changes to crude oil, NGL, and natural gas revenues and lease operating expense are due to the conclusion that the Company controls the product throughout processing before transferring to the customer for certain natural gas processing arrangements. Therefore, any transportation, gathering, and processing fees incurred prior to transfer of Update 2014-09 on its consolidated financial statements.control are included in lease operating expense.
3.Business Combinations. Discontinued OperationsIn January 2017, the Financial Accounting Standards Board (“FASB”) issued ASU No. 2017-01, Business Combinations (Topic 805): Clarifying the Definition of a Business (“ASU 2017-01”), which clarifies the definition of a business to assist entities with evaluating whether transactions should be accounted for as acquisitions (or divestitures) of assets or businesses. Effective January 1, 2018, the Company adopted ASU 2017-01 using the prospective method and applied the clarified definition of a business to subsequent acquisitions and divestitures.
On February 22, 2013,Statement of Cash Flows. In August 2016, the FASB issued ASU No. 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments (“ASU 2016-15”), which is intended to reduce diversity in practice in how certain transactions are classified in the statement of cash flows. The guidance addresses eight specific cash flow issues for which current GAAP is either unclear or does not include specific guidance. Effective January 1, 2018, the Company closed onadopted ASU 2016-15 using the saleretrospective approach as prescribed by ASU 2016-15. There were no changes to the statement of Carrizo UK,cash flows as a result of adoption.
Stock Compensation. In March 2016, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2016-09, Compensation - Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment


Accounting (“ASU 2016-09”), which amends certain aspects of accounting for share-based payment arrangements. ASU 2016-09 revises or provides alternative accounting for the tax impacts of share-based payment arrangements, forfeitures, minimum statutory tax withholdings, and all of its interestprescribes certain disclosures to be made in the Huntington Field discovery, includingperiod of adoption.
Effective January, 1, 2017, the Company adopted ASU 2016-09. Using the modified retrospective approach as prescribed by ASU 2016-09, the Company recognized previously unrecognized windfall tax benefits which resulted in a 15% non-operated working interest and certain overriding royalty interests,cumulative-effect adjustment to a subsidiaryretained earnings of Iona Energy for an agreed-upon price of $184.0 million, includingapproximately $15.7 million. This adjustment increased deferred tax assets, which in turn increased the assumption and repaymentvaluation allowance by Iona Energy of the $55.0 million of borrowings outstanding under Carrizo UK’s senior secured multicurrency credit facilitysame amount as of the closing date. The liabilities, resultsbeginning of operations2017, resulting in a net cumulative-effect adjustment to retained earnings of zero. Effective January 1, 2017, all windfall tax benefits and cash flows associated with Carrizo UK have been classifiedtax shortfalls are recorded as discontinued operations in the consolidated financial statements. The liabilities of discontinued operations of $3.8 million and $12.8 million as of December 31, 2015 and 2014, respectively, relate to an accrual for estimated future obligations related to the sale. See “Note 2. Summary of Significant Accounting Policies—Use of Estimates” for further discussion of estimates and assumptions that may affect the reported amounts of liabilities related to the sale of Carrizo UK.
The following table summarizes the amounts included in income from discontinued operations, net of income taxes presentedtax expense or benefit in the consolidated statements of operations, whereas prior to adoption, windfall tax benefits were recorded as an increase to additional paid-in capital. In addition, windfall tax benefits, along with tax shortfalls, are now required to be classified as an operating cash flow as opposed to a financing cash flow. Further, the Company has elected to account for forfeitures of share-based payment awards as they occur, which resulted in an immaterial cumulative-effect adjustment to retained earnings.
Recently Issued Accounting Pronouncements
Leases. In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842) (“ASU 2016-02”), which significantly changes accounting for leases by requiring that lessees recognize a right-of-use (“ROU”) asset and a related lease liability representing the obligation to make lease payments, for virtually all lease transactions. ASU 2016-02 does not apply to leases of mineral rights to explore for or use crude oil and natural gas. Additional disclosures about an entity’s lease transactions will also be required. ASU 2016-02 defines a lease as “a contract, or part of a contract, that conveys the right to control the use of identified property, plant or equipment (an identified asset) for a period of time in exchange for consideration.” ASU 2016-02 is effective for interim and annual periods beginning after December 15, 2018 with early adoption permitted. ASU 2016-02 requires companies to recognize and measure leases at the beginning of the earliest period presented in the financial statements using a modified retrospective approach.
The Company will adopt ASU 2016-02 effective January 1, 2019, using the modified retrospective approach. The Company will make certain elections allowing it to not reassess contracts that commenced prior to adoption, to continue applying its current accounting policy for land easements, not to recognize ROU assets or lease liabilities for short-term leases, and will not separate lease components from non-lease components for specified asset classes. The Company has implemented a third party software which will be used to track and account for lease activity. As of December 31, 2018, the Company anticipates that the adoption of ASU 2016-02 will result in the recognition of ROU assets and lease liabilities on its consolidated balance sheets ranging from $75.0 million to $100.0 million primarily associated with office space contracts, drilling rig contracts, and contracts for the years ended December 31, 2015, 2014use of vehicles, information technology infrastructure and 2013:
  Years Ended December 31,
  2015 2014 2013
  (In thousands)
Revenues 
$—
 
$—
 
$—
       
Costs and expenses      
General and administrative 1,426
 656
 916
Accretion related to asset retirement obligations 
 
 36
Gain on sale of discontinued operations 
 
 (37,294)
Increase (decrease) in estimated future obligations (6,424) (7,638) 44
Loss on derivatives, net 
 34
 109
Other income, net 
 
 (438)
Income From Discontinued Operations Before Income Taxes 4,998
 6,948
 36,627
Income tax expense (2,267) (2,888) (14,802)
Income From Discontinued Operations, Net of Income Taxes 
$2,731
 
$4,060
 
$21,825
Carrizo UK is a disregarded entity for U.S. federal income tax purposes. Accordingly, the income tax expense reflected above includes the Company’s U.S. deferred income tax expense associated with the income from discontinued operations before income taxes. The related U.S. deferred tax liabilities have been classified as deferred income taxes of continuing operations in the consolidated balance sheets.
4. Acquisition and Divestiture
2014 Acquisition
On October 24, 2014,well equipment. However, the Company completeddoes not expect ASU 2016-02 to have a significant impact on its consolidated statements of operations or consolidated statements of cash flows. The Company is finalizing its accounting policies, controls, processes, and disclosures that will change as a result of adopting the acquisitionnew standard. As permitted by ASU No. 2018-11, Leases (Topic 842): Targeted Improvements, the Company does not expect to adjust comparative-period financial statements.
Subsequent Events
The Company evaluates subsequent events through the date the financial statements are issued. See “Note 16. Subsequent Events” for further discussion.
3. Acquisitions and Divestitures of interests inOil and Gas Properties
2018 Acquisitions and Divestitures
Devon Acquisition. On August 13, 2018, the Company entered into a purchase and sale agreement with Devon Energy Production Company, L.P. (“Devon”), a subsidiary of Devon Energy Corporation, to acquire oil and gas properties (the “Properties”) from Eagle Ford Minerals, LLC (“EFM”) primarily in LaSalle, Atascosathe Delaware Basin in Reeves and McMullenWard counties, Texas in the Eagle Ford (the “Eagle Ford Shale Acquisition”“Devon Properties”). The Eagle Ford Shale Acquisition had for an agreed upon price of $215.0 million, with an effective date of OctoberApril 1, 2014, with an agreed upon2018, subject to customary purchase price of $250.0 million, of which theadjustments (the “Devon Acquisition”). The Company paid $21.5 million as a total of $241.8deposit on August 13, 2018 and $183.4 million net of post-closing and working capitalupon initial closing on October 17, 2018, which included purchase price adjustments which consisted of approximately $93.0 million at closing and $148.8 million on February 13, 2015. Priorprimarily related to the Eagle Ford Shale Acquisition,net cash flows from the Company and EFM were joint working interest owners in the Properties, for which the Company acted as the operator and owned an approximate 75% working interest in all of such Properties. After giving effecteffective date to the Eagle Ford Shale

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closing date. The Company estimates the aggregate purchase price will be $196.6 million, however, the final purchase price remains subject to post-closing adjustments. The Company funded the Devon Acquisition with net proceeds from the Company holds an approximate 100% working interest incommon stock offering completed on August 17, 2018, which, pending the Properties. The deferred purchase payment was discounted by $2.6 million to an acquisition date fair value of $147.4 million. For the further discussionclosing of the accountingDevon Acquisition, were used to temporarily repay a portion of the borrowings outstanding under the revolving credit facility. See “Note 10. Shareholders’ Equity” for the deferred purchase payment, see “Note 7. Long-Term Debt.”further discussion.
The Eagle Ford ShaleDevon Acquisition was accounted for under the acquisition method of accounting wherebyas a business combination, therefore, the purchase price iswas allocated to the assets acquired and the liabilities assumed based on their estimated acquisition date fair values. Purchase price adjustmentsvalues based on then currently available information. A combination of $3.2 million relate toa discounted cash flow model and market data was used by a third-party valuation specialist in determining the revenues,fair value of the oil and gas properties. Significant inputs into the calculation included future commodity prices,


estimated volumes of oil and gas reserves, expectations for timing and amount of future development and operating expensescosts, future plugging and capital expenditures for the period from the October 1, 2014 effective date to the October 24, 2014 closing date.
abandonment costs and a risk adjusted discount rate. The following presents the purchase price and thepreliminary allocation of the purchase price to the assets acquired and liabilities assumed as of the acquisition date:date.
  October 24, 2014Preliminary Purchase Price Allocation
  (In thousands)
Assets  
Other current assetsOil and gas properties
Proved properties 
$48547,370
Proved and unprovedUnproved properties150,253
Total oil and gas properties 244,124
$197,623
Total assets acquired 
$244,609197,623
   
Liabilities  
Revenues and royalties payable
$855
Asset retirement obligations 
$423170
Total liabilities assumed 
$4231,025
Net Assets Acquired 
$244,186196,598
IncludedThe results of operations for the Devon Acquisition have been included in the Company’s consolidated statements of operations since the October 17, 2018 closing date, including total revenues $4.6 million and net income attributable to common shareholders of $2.7 million for the year ended December 31, 2014 are revenues of $13.1 million and income from continuing operations of $11.0 million from the Properties, representing activity subsequent to the closing of the transaction.2018.
Pro Forma Operating Results (Unaudited)
. The following unaudited pro forma financial information presents a summary of the Company’s consolidated results of operations for the years ended December 31, 2014,2018 and December 31, 2013,2017, assuming the Eagle Ford ShaleDevon Acquisition had been completed as of January 1, 2013,2017, including adjustments to reflect the acquisition date fair values assigned to the assets acquired and liabilities assumed. The pro forma financial information does not purport to represent what the actual results of operations would have been had the transactions been completed as of the date assumed, nor is this information necessarily indicative of future consolidated results of operations. The Company believes the assumptions used provide a reasonable basis for reflecting the significant pro forma effects directly attributable to the Devon Acquisition.
  Years Ended December 31,
  2018 2017
  (In thousands, except per share amounts)
Total revenues 
$1,086,742
 
$753,474
Net Income Attributable to Common Shareholders 
$384,639
 
$78,118
     
Net Income Attributable to Common Shareholders Per Common Share    
Basic 
$4.21
 
$0.94
Diluted 
$4.13
 
$0.94
     
Weighted Average Common Shares Outstanding    
Basic 91,444
 82,921
Diluted 93,077
 83,493
Delaware Basin Divestiture. On July 11, 2018, the Company closed on the divestiture of certain non-operated assets in the Delaware Basin for an agreed upon price of $30.0 million, with an effective date of May 1, 2018, subject to customary purchase price adjustments. The Company received $31.4 million upon closing on July 11, 2018 and paid $0.5 million upon post-closing on October 22, 2018, for aggregate net proceeds of $30.9 million.
Eagle Ford Divestiture. On December 11, 2017, the Company entered into a purchase and sale agreement with EP Energy E&P Company, L.P. to sell a portion of its assets in the Eagle Ford Shale Acquisition.
  Years Ended December 31,
  2014 2013
  
(In thousands, except per share data)
(Unaudited)
Total revenues 
$761,199
 
$575,721
Income From Continuing Operations 
$264,714
 
$36,356
     
Income From Continuing Operations Per Common Share    
Basic 
$5.83
 
$0.89
Diluted 
$5.73
 
$0.88
     
Weighted Average Common Shares Outstanding    
Basic 45,372
 40,781
Diluted 46,194
 41,355
2013 Divestiture
During the fourth quarter of 2013, the Company sold its remaining oil and gas properties in the Barnett to EnerVest Energy Institutional Fund XIII-A, L.P., EnerVest Energy Institutional Fund XIII-WIB, L.P., EnerVest Energy Institutional Fund XIII-WIC, L.P., and EV Properties, L.P., (collectively, “EnerVest”). Net proceeds received from the sale were approximately $191.8 million, which representsfor an agreed upon purchase price of approximately $218.0$245.0 million, lesswith an effective date of October 1, 2017, subject to adjustment and customary terms and conditions. The Company received $24.5 million as a deposit on December 11, 2017, $211.7 million upon closing on January 31, 2018, $10.0 million for leases that were not conveyed at closing on February 16, 2018, and paid $0.5 million upon post-closing on July 19, 2018, for aggregate net proceeds of $245.7 million.


Niobrara Divestiture.On November 20, 2017, the Company entered into a purchase and sale agreement to sell substantially all of its assets in the Niobrara Formation for an agreed upon price of $140.0 million, with an effective date of October 1, 2017, subject to customary purchase price adjustments. Purchase price adjustments primarily relate to proceedsThe Company received by the Company for sales of hydrocarbons from such properties between

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the effective date of July 1, 2013 and the closing date of October 31, 2013. The proved reserves attributable to the properties sold to EnerVest represented 40% of the Company’s proved reserves as of October 31, 2013 and the sale resulted in a significant alteration of the relationship between capitalized costs and proved reserves attributable to the Company’s U.S. cost center. As a result, the Company recognized a pre-tax loss on the sale of $45.4$14.0 million as a componentdeposit on November 20, 2017, $122.6 million upon closing on January 19, 2018, and paid $1.0 million upon post-closing on August 14, 2018, for aggregate net proceeds of operating income in$135.6 million. As part of this divestiture, the fourth quarterCompany agreed to a contingent consideration arrangement (the “Contingent Niobrara Consideration”), which was determined to be an embedded derivative. See “Note 12. Derivative Instruments” and “Note 13. Fair Value Measurements” for further discussion.
The aggregate net proceeds for each of 2013 rather than recognizing the proceeds2018 divestitures discussed above were recognized as a reduction of proved oil and gas properties with no gain or loss recognized.
2017 Acquisitions and Divestitures
ExL Acquisition. On June 28, 2017, the Company entered into a purchase and sale agreement with ExL Petroleum Management, LLC and ExL Petroleum Operating Inc. to acquire oil and gas properties located in the Delaware Basin in Reeves and Ward counties, Texas for an agreed upon price of $648.0 million, with an effective date of May 1, 2017, subject to customary purchase price adjustments (the “ExL Acquisition”). The Company paid $75.0 million as a deposit on June 28, 2017, $601.0 million upon closing on August 10, 2017 and $3.8 million upon post-closing on December 8, 2017, for an aggregate cash consideration of $679.8 million, which included purchase price adjustments primarily related to the net cash flows from the effective date to the closing date. As part of the ExL Acquisition, the Company agreed to a contingent consideration arrangement (the “Contingent ExL Consideration”), which was determined to be an embedded derivative. See “Note 12. Derivative Instruments” and “Note 13. Fair Value Measurements” for further discussion.
The Company funded the ExL Acquisition with net proceeds from the sale of preferred stock on August 10, 2017, net proceeds from the common stock offering completed on July 3, 2017, and net proceeds from the senior notes offering completed on July 14, 2017. See “Note 9. Preferred Stock and Common Stock Warrants”, “Note 10. Shareholders’ Equity” and “Note 6. Long-Term Debt” for further discussion.
The ExL Acquisition was accounted for as a business combination, therefore, the purchase price was allocated to the assets acquired and the liabilities assumed based on their estimated acquisition date fair values based on then currently available information. A combination of a discounted cash flow model and market data was used by a third-party valuation specialist in determining the fair value of the oil and gas properties. Significant inputs into the calculation included future commodity prices, estimated volumes of oil and gas reserves, expectations for timing and amount of future development and operating costs, future plugging and abandonment costs and a risk adjusted discount rate. The fair value of the Contingent ExL Consideration was determined by a third-party valuation specialist using a Monte Carlo simulation. Significant inputs into the calculation included future commodity prices, volatility factors for the future commodity prices and a risk adjusted discount rate. See “Note 13. Fair Value Measurements” for further discussion.
The following presents the final allocation of the purchase price to the assets acquired and liabilities assumed as of the acquisition date.
Purchase Price Allocation
(In thousands)
Assets
Other current assets
$106
Oil and gas properties
Proved properties294,754
Unproved properties443,194
Total oil and gas properties
$737,948
Total assets acquired
$738,054
Liabilities
Revenues and royalties payable
$5,785
Asset retirement obligations153
Contingent ExL Consideration52,300
Total liabilities assumed
$58,238
Net Assets Acquired
$679,816


The results of operations for the ExL Acquisition have been included in the Company’s consolidated statements of operations since the August 10, 2017 closing date, including total revenues and net income attributable to common shareholders for the years ended December 31, 2018 and 2017 as shown in the table below:
  Years Ended December 31,
  2018 2017
  (In thousands)
Total revenues 
$225,135
 
$53,548
     
Net Income Attributable to Common Shareholders 
$176,881
 
$44,304
Pro Forma Operating Results (Unaudited). The following unaudited pro forma financial information presents a summary of the Company’s consolidated results of operations for the years ended December 31, 2017 and 2016, assuming the ExL Acquisition had been completed as of January 1, 2016, including adjustments to reflect the acquisition date fair values assigned to the assets acquired and liabilities assumed. The pro forma financial information does not purport to represent what the actual results of operations would have been had the transactions been completed as of the date assumed, nor is this information necessarily indicative of future consolidated results of operations. The Company believes the assumptions used provide a reasonable basis for reflecting the significant pro forma effects directly attributable to the ExL Acquisition.
  Years Ended December 31,
  2017 2016
  (In thousands, except per share amounts)
Total revenues 
$781,378
 
$454,913
Net Income (Loss) Attributable to Common Shareholders 
$91,931
 
($688,180)
     
Net Income (Loss) Attributable to Common Shareholders Per Common Share    
Basic 
$1.25
 
($9.11)
Diluted 
$1.24
 
($9.11)
     
Weighted Average Common Shares Outstanding    
Basic 73,421
 75,532
Diluted 73,993
 75,532
Marcellus Divestiture. On October 5, 2017, the Company entered into a purchase and sale agreement with BKV Chelsea, LLC, a subsidiary of Kalnin Ventures LLC, to sell substantially all of its assets in the Marcellus Shale for an agreed upon price of $84.0 million. The Company received $6.3 million into escrow as a deposit on October 5, 2017 and $67.6 million upon closing on November 21, 2017, for aggregate net proceeds of $73.9 million. As part of this divestiture, the Company agreed to a contingent consideration arrangement (the “Contingent Marcellus Consideration”), which was determined to be an embedded derivative. See “Note 12. Derivative Instruments” and “Note 13. Fair Value Measurements” for further discussion.
Effective August 2008, the Company’s wholly-owned subsidiary, Carrizo (Marcellus) LLC, entered into a joint venture with ACP II Marcellus LLC (“ACP II”), an affiliate of Avista Capital Partners, LP, a private equity fund (Avista Capital Partners, LP, together with its affiliates, “Avista”). There have been no revenues, expenses, or operating cash flows in the Avista Marcellus joint venture during the years ended December 31, 2018, 2017, and 2016. The Avista Marcellus joint venture agreements terminated during the third quarter of 2018 in connection with the sale of the remaining immaterial assets.
Steven A. Webster, Chairman of the Company’s Board of Directors, serves as Co-Managing Partner and President of Avista Capital Holdings, LP, which has the ability to control Avista and its affiliates. ACP II’s Board of Managers has the sole authority for determining whether, when and to what extent any cash distributions will be declared and paid to members of ACP II. Mr. Webster is not a member of ACP II’s Board of Managers. The terms of the Avista Marcellus joint venture were approved by a special committee of the Company’s independent directors. Additionally, in 2018, the Company’s Board of Directors determined that Mr. Webster is independent with respect to the Company.
Utica Divestiture. On August 31, 2017, the Company entered into a purchase and sale agreement to sell substantially all of its assets in the Utica Shale for an agreed upon price of $62.0 million. The Company received $6.2 million as a deposit on August 31, 2017, $54.4 million upon closing on November 15, 2017, and $2.5 million upon post-closing on December 28, 2017, for aggregate net proceeds of $63.1 million. As part of this divestiture, the Company agreed to a contingent consideration arrangement (the “Contingent Utica Consideration”), which was determined to be an embedded derivative. See “Note 12. Derivative Instruments” and “Note 13. Fair Value Measurements” for further discussion.


Delaware Basin Divestiture. During the first quarter of 2017, the Company sold a small undeveloped acreage position in the Delaware Basin for aggregate net proceeds of $15.3 million.
The aggregate net proceeds for each of the 2017 divestitures discussed above were recognized as a reduction of proved oil and gas properties with no gain or loss recognized.
2016 Acquisitions and Divestitures
Sanchez Acquisition. On October 24, 2016, the Company entered into a purchase and sale agreement with Sanchez Energy Corporation and SN Cotulla Assets, LLC, a subsidiary of Sanchez Energy Corporation to acquire oil and gas properties located in the Eagle Ford Shale for an agreed upon price of $181.0 million, with an effective date of June 1, 2016, subject to customary purchase price adjustments (the “Sanchez Acquisition”). The Company paid $10.0 million as a deposit on October 24, 2016, $143.5 million upon initial closing on December 14, 2016, and $7.0 million and $9.8 million on January 9, 2017 and April 13, 2017, respectively, for leases that were not conveyed to the Company at the time of the initial closing, for aggregate cash consideration of $170.3 million, which included purchase price adjustments primarily related to the net cash flows from the effective date to the closing date.
The Sanchez Acquisition was accounted for as a business combination, therefore, the purchase price was allocated to the assets acquired and liabilities assumed based on their estimated acquisition date fair values based on then currently available information.
The results of operations for the Sanchez Acquisition have been included in the Company’s consolidated statements of operations since the December 14, 2016 closing date, including total revenues and net income attributable to common shareholders for the years ended December 31, 2018, 2017, and 2016 as shown in the table below:
  Years Ended December 31,
  2018 2017 2016
  (In thousands)
Total revenues 
$57,780
 
$37,780
 
$1,459
       
Net Income Attributable to Common Shareholders 
$38,551
 
$16,459
 
$966
The Company did not have any material divestitures for the year ended December 31, 2016.
5.4. Property and Equipment, Net
As of December 31, 20152018 and 20142017, total property and equipment, net consisted of the following:
 December 31, December 31,
 2015 2014 2018 2017
 (In thousands)
Oil and gas properties, full cost method (In thousands)
Proved properties 
$3,976,511
 
$3,174,268
 
$6,278,321
 
$5,615,153
Accumulated depreciation, depletion and amortization and impairment (2,607,360) (1,087,541)
Accumulated DD&A and impairments (3,944,851) (3,649,806)
Proved properties, net 1,369,151
 2,086,727
 2,333,470
 1,965,347
Unproved properties, not being amortized        
Unevaluated leasehold and seismic costs 280,263
 401,954
 608,830
 612,589
Exploratory wells in progress 9,432
 71,402
Capitalized interest 45,757
 61,841
 65,003
 47,698
Total unproved properties, not being amortized 335,452
 535,197
 673,833
 660,287
Other property and equipment 22,677
 16,017
 29,191
 25,625
Accumulated depreciation (10,419) (8,688) (17,970) (15,449)
Other property and equipment, net 12,258
 7,329
 11,221
 10,176
Total property and equipment, net 
$1,716,861
 
$2,629,253
 
$3,018,524
 
$2,635,810
The Company capitalized internal costs of employee compensation and benefits, including stock-based compensation, directly associated with acquisition, exploration and development activities totaling $17.0 million, $14.8 million and $10.5 million for the years ended December 31, 2018, 2017 and 2016, respectively.
The Company capitalized interest costs to unproved properties totaling $36.6 million, $28.3 million and $17.0 million for the years ended December 31, 2018, 2017 and 2016, respectively.
Costs not subject to amortization totaling $335.5$673.8 million at December 31, 20152018 were incurred in the following periods: $33.6$218.9 million in 2015, $258.42018, $397.7 million in 20142017 and $43.5$57.2 million in 2013.2016.
Full Cost Ceiling Test Impairments
In the third
Impairments of Proved Oil and fourth quarter of 2015, theGas Properties
The Company recorded after-tax impairments in the carrying value of proved oil and gas properties of $795.8 million ($1,224.4 million pre-tax) due primarily to declines in the average realized prices for sales of oil on the first calendar day of each month during the trailing 12-month period prior to December 31, 2015. There were nodid not recognize impairments of proved oil and gas properties for the years endingended December 31, 20142018 and 2013.
The Company expects2017. Primarily due to record an impairmentdeclines in the carrying value12-Month Average Realized Price of crude oil, the Company recognized impairments of proved oil and gas properties in the first quarter of 2016 due to the continued decrease in crude oil prices. The Company estimates the oil price to be used in the calculation of the full cost ceiling test to be $45.85 based on the first calendar day of each month oil prices available for the 11 months ended February 1, 2016 and using a NYMEX strip price for the twelfth month. This is a 9% decrease from the oil price used in the calculation of the full cost ceiling test$576.5 million for the year ended December 31, 2015 of $50.28/Bbl. Further impairments in subsequent quarters may occur if the trailing 12-month commodity prices continue to be lower than the comparable trailing 12-month commodity prices discussed above.2016.
6.5. Income Taxes
The components of income tax expense (benefit) from continuing operations were as follows:
  Years Ended December 31,
  2015 2014 2013
  (In thousands)
Current income tax (expense) benefit      
U.S. Federal 
$—
 
$—
 
$411
State 
 
 (141)
Total current income tax benefit 
 
 270
Deferred income tax (expense) benefit      
U.S. Federal 131,502
 (122,342) (12,404)
State 9,373
 (5,585) (769)
Total deferred income tax (expense) benefit 140,875
 (127,927) (13,173)
Total income tax (expense) benefit from continuing operations 
$140,875
 
($127,927) 
($12,903)
  Years Ended December 31,
  2018 2017 2016
  (In thousands)
Current income tax expense      
U.S. Federal 
$—
 
$—
 
$—
State (792) (395) 
Total current income tax expense (792) (395) 
Deferred income tax expense      
U.S. Federal 
 
 
State (4,381) (3,635) 
Total deferred income tax expense (4,381) (3,635) 
Income tax expense 
($5,173) 
($4,030) 
$—

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The Company’s income tax (expense) benefit from continuing operationsexpense differs from the income tax (expense) benefitexpense computed by applying the U.S. federal statutory corporate income tax rate of 35%21% for the year ended December 31, 2018 and 35% for the years ended December 31, 2017 and 2016, to income (loss) from continuing operations before income taxes as follows:
  Years Ended December 31,
  2015 2014 2013
  (In thousands)
Income (loss) from continuing operations before income taxes 
($1,298,760) 
$350,210
 
$34,761
Income tax (expense) benefit at the statutory rate 454,566
 (122,574) (12,166)
State income tax (expense) benefit, net of U.S. Federal income taxes and increase in valuation allowance 9,373
 (5,585) (859)
Texas Franchise Tax rate reduction, net of U.S. Federal income tax expense 1,671
 
 
Deferred tax asset valuation allowance (323,586) 
 
Other (1,149) 232
 122
Total income tax (expense) benefit from continuing operations 
$140,875
 
($127,927) 
($12,903)
  Years Ended December 31,
  2018 2017 2016
  (In thousands)
Income (loss) before income taxes 
$409,600
 
$91,140
 
($675,474)
Income tax (expense) benefit at the U.S. federal statutory rate (86,016) (31,899) 236,416
State income tax (expense) benefit, net of U.S. federal income tax benefit (5,173) (4,030) 3,894
Tax deficiencies related to stock-based compensation (2,572) (3,089) 
Provisional impact of Tax Cuts and Jobs Act 
 (211,724) 
Change in valuation allowance from provisional impact of Tax Cuts and Jobs Act 
 211,724
 
(Increase) decrease in valuation allowance due to current period activity 90,116
 35,376
 (240,864)
Other (1,528) (388) 554
Income tax expense 
($5,173) 
($4,030) 
$—
Significant changes in the Company’s operations impact the apportionment of taxable income to the states where the Company owns oil and gas properties. As discussed in “Note 3. Acquisitions and Divestitures of Oil and Gas Properties,” beginning in 2017 and continuing into 2018, the Company divested all of its assets in Marcellus, Utica, and Niobrara, and is currently operating solely in Texas. This operational shift has resulted in current and deferred tax liabilities in Texas that cannot be offset against the full valuation allowance that the Company has maintained.


Deferred Income Taxes
Deferred income taxes reflect the impact of temporary differences between the amount of assets and liabilities recognized for financial reporting purposes and such amounts recognized for tax purposes. As of December 31, 20152018 and 2014,2017, the net deferred income tax assets and liabilities are comprised of the following:
 December 31, December 31,
 2015 2014 2018 2017
 (In thousands) (In thousands)
Deferred income tax liabilities    
Oil and gas properties 
($16,610) 
($3,635)
Derivative assets (10,008) (2,140)
Total deferred income tax liabilities (26,618) (5,775)
Deferred income tax assets        
Net operating loss carryforward - U.S. Federal and State 
$119,783
 
$56,876
Net operating loss carryforward - U.S. federal and state 235,788
 242,915
Oil and gas properties 232,786
 
 
 50,177
Asset retirement obligations 5,779
 4,379
 3,927
 4,996
Stock-based compensation 4,741
 7,867
Fair value of derivative instruments 4,433
 70
Derivative liabilities 20,165
 35,585
Other 3,435
 2,989
 1,634
 1,496
Deferred income tax assets 370,957
 72,181
Deferred tax asset valuation allowance (324,681) (1,095)
Total deferred income tax assets 261,514
 335,169
Deferred income tax asset valuation allowance (242,913) (333,029)
Net deferred income tax assets 46,276
 71,086
 18,601
 2,140
Deferred income tax liabilities    
Oil and gas properties 
 (134,518)
Fair value of derivative instruments (46,276) (75,175)
 (46,276) (209,693)
Net deferred income tax liability 
$—
 
($138,607)
Net deferred income tax liabilities 
($8,017) 
($3,635)
DeferredTax Cuts and Jobs Act
On December 22, 2017, the U.S. Congress enacted the Tax Cuts and Jobs Act (the “Act”) which made significant changes to U.S. federal income tax assetslaw, including lowering the federal statutory corporate income tax rate to 21% from 35% beginning January 1, 2018. Due to the uncertainty regarding the application of ASC 740 in the period of enactment of the Act, the SEC issued Staff Accounting Bulletin 118 (“SAB 118”) which allowed the Company to provide a provisional estimate of the impacts of the Act in its earnings for the year ended December 31, 2017 and liabilitiesalso provided a one-year measurement period in which the Company would record additional impacts from the enactment of the Act as they are classifiedidentified. As a result, the Company remeasured its deferred tax balances by applying the reduced rate and recorded a provisional deferred tax expense of $211.7 million during the year ended December 31, 2017. This provisional deferred tax expense was fully offset by a $211.7 million deferred tax benefit as current or noncurrent baseda result of the associated change in the valuation allowance against the net deferred tax assets. As reflected in the rate reconciliation above, the change in the deferred tax balances due to the rate reduction had no impact on the classification of the related asset or liabilitynet deferred tax balances reported in the consolidated balance sheet exceptsheets as of December 31, 2017 and no impact in the consolidated statements of operations for the year ended December 31, 2017.
In August 2018, the Internal Revenue Service (“IRS”) issued Notice 2018-68, Guidance on the Application of Section 162(m) (“Notice 2018-68”), which provides initial guidance on the application of Section 162(m), as amended. Notice 2018-68 provided guidance regarding the group of covered employees subject to Section 162(m)’s deduction limit under the Act and the scope of transition relief available under the Act.
In November 2018, the IRS issued proposed regulations on business interest expense deduction limitations for tax years beginning after 2017, which included an expanded definition of what is considered interest expense as well as changes to the calculation of a taxpayer’s adjusted taxable income in computing the interest expense limitation. The Company has assessed these proposed regulations as they pertain to the provisional tax estimate for the year ended December 31, 2018, and has concluded it will have no interest expense deduction limitation to be carried forward to future years for the 2018 tax year.
As of December 31, 2018, the Company has completed its accounting for the tax effects of enactment of the Act, with immaterial changes made to the provisional estimate that was recorded in earnings for the year ended December 31, 2017.
Deferred Tax Asset Valuation Allowance
The deferred tax asset valuation allowance was $242.9 million, $333.0 million, and $564.4 million as of December 31, 2018, 2017, and 2016, respectively. Effective January 1, 2017, the Company adopted ASU 2016-09, and recognized previously unrecognized windfall tax benefits which resulted in a cumulative-effect adjustment to retained earnings of approximately $15.7 million. This adjustment increased deferred tax assets, relatedwhich in turn increased the valuation allowance by the same amount as of the beginning of 2017, resulting in a net cumulative-effect adjustment to net operating loss carryforwards which is classifiedretained earnings of zero and brought the valuation allowance to $580.1 million as current or noncurrentof January 1, 2017. Decreases in the valuation allowance for the years ended December 31, 2018 and 2017 were based primarily on the periodspre-tax income recorded during those periods.


Throughout 2016, 2017, and 2018, the carryforwards are expected to be utilized. By taxing jurisdiction, all current deferred tax assets and liabilities are offset and presented asCompany maintained a net current deferred tax asset or liability and all noncurrent deferred tax assets and liabilities are offset and presented as a net noncurrent deferred tax asset or liability. At December 31, 2015 and 2014, the net deferred income tax asset (liability) is classified as follows:
  December 31,
  2015 2014
  (In thousands)
Net current deferred income tax liability 
($46,758) 
($61,258)
Net noncurrent deferred income tax asset (liability) 46,758
 (77,349)
Net deferred income tax liability 
$—
 
($138,607)

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Deferred tax assetfull valuation allowance. The ultimate realization of deferred tax assets is dependent upon the generation of future taxable income during the periods in which those deferred tax assets would be deductible. The Company assesses the realizability ofallowance against its deferred tax assets each period bybased on its conclusion, considering whether it is more likely than not that all or a portion of the deferred tax assets will not be realized. The Company considers all available evidence (both positive and negative) when determining whether a valuation allowance is required. The Company evaluated possible sources of taxable income, that may be available to realize the benefit of deferred tax assets, including projected future taxable income, the reversal of existing temporary differences, taxable income in carryback years and available tax planning strategies in making this assessment.
A significant item of objective negative evidence considered was the cumulative historical three year pre-tax loss and a net deferred tax asset position at December 31, 2015, driven primarily by the full cost ceiling impairments recognized during the third quarter and fourth quarter of 2015, which limits the ability to consider other subjective evidence such as the Company’s anticipated future growth. The Company concluded in the third quarter 2015 it was more likely than not that the deferred tax assetstaxes would not be realized and recorded a valuation allowance totaling $187.6 million against the net deferred tax asset of as of September 30, 2015. The valuation allowance was further increased to $324.7 million against the net deferred tax assets as of December 31, 2015 reducing the net deferred tax assets to zero.
realized. The Company will continueintends to evaluate whether the valuation allowance is needed in future reporting periods. The valuation allowance will remain until the Company can determine that the net deferred tax assets are more likely than not to be realized. Future events or new evidence which may lead the Company to conclude that it is more likely than not that its net deferred tax assets will be realized include, but are not limited to, cumulative historical pre-tax earnings, improvements in oil prices, and taxable events that could result from one or more transactions. The valuation allowance does not prevent future utilization of the tax attributes if the Company recognizes taxable income. As long as the Company concludes that themaintain a full valuation allowance against its net deferred tax assets until there is necessary,sufficient evidence to support the Company likely will not have any additional deferred income tax expense or benefit.reversal of such valuation allowance.
Net Operating Loss Carryforwards and Other
Net Operating Loss Carryforwards. As of December 31, 2015,2018, the Company had U.S. federal net operating loss carryforwards of approximately $366.8 million. If$1,062.5 million that, if not utilized in earlier periods, the U.S. federal net operating loss will expire between 2026 and 2035.2037.
The ability of the Company to utilize its U.S. loss carryforwards to reduce future taxable income is subject to various limitations under the Internal Revenue Code of 1986, as amended (the “Code”). The utilization of such carryforwards may be limited upon the occurrence of certain ownership changes, including the purchase or sale of stock by 5% shareholders and the offering of stock by the Company during any three-year period resulting in an aggregate change of more than 50% in the beneficial ownership of the Company. In the event of an ownership change, Section 382 of the Code imposes an annual limitation on the amount of the Company’s taxable income that can be offset by these carryforwards. The limitation is generally equal to the product of (a)(i) the fair market value of the equity of the Company multiplied by (b)(ii) a percentage approximately equivalent to the yield on long-term tax exempt bonds during the month in which an ownership change occurs. In addition, the limitation is increased if there are recognized built-in gains during any post-change year, but only to the extent of any net unrealized built-in gains inherent in the assets sold.
AsDue to the issuance of the Preferred Stock and the common stock offering associated with the ExL Acquisition, as well as the common stock offering in August 2018, the Company’s calculated ownership change percentage increased, however, as of December 31, 2015,2018, the Company believes an ownership change occurred in February 2005, which imposed an annual limitation of $12.6 million of the Company’s taxable income that can be offset by the pre-change carryforwards. Because the Company’s aggregate pre-change carryforward is $9.8 million, the Company doesdid not believe it hashave a Section 382 limitation on the ability to utilize its U.S. net operating loss carryforwards as of December 31, 2015.carryforwards. Future equity transactions involving the Company or 5% shareholders of the Company (including, potentially, relatively small transactions and transactions beyond the Company’s control) could cause further ownership changes and therefore a limitation on the annual utilization of the U.S.U. S. net operating loss carryforwards.
The Company receives a tax deduction during the period stock options and SARs are exercised, generally for the excess of the exercise date stock price over the exercise price of the option or SAR. The Company also receives a tax deduction during the period restricted stock awards and units vest, generally equal to the fair value of the awards or units on the vesting date. Because these stock-based compensation tax deductions did not reduce current taxes payable as a result of U.S. loss carryforwards, the benefit of these tax deductions has not been reflected in the U.S. loss carryforward deferred tax asset. Stock-based compensation tax deductions included in the U.S. loss carryforwards of $366.8 million but not reflected in the associated deferred tax asset were $44.7 million as of December 31, 2015. The Company expects to recognize the $15.7 million deferred tax asset associated with these stock-based compensation tax deductions under the tax law ordering approach which looks to the provision within the tax law for determining the sequence in which the U.S. loss carryforwards and other tax attributes are utilized. When the stock-based compensation tax deduction related U.S. loss carryforward deferred tax asset is realized, the tax benefit of reducing current taxes payable will be credited directly to additional paid-in capital.
Other. The Company files income tax returns in the U.S. Federalfederal jurisdiction inand various states, and previously filed in one foreign jurisdiction, each with varying statutes of limitations. The 19992006 through 20152018 tax years generally remain subject to examination

F-17



by federal and state tax authorities. The foreign jurisdiction generally remains subject to examination by the relevant taxing authority for the 2014 and 2015 tax years through 2016 and 2017, respectively. The Company received notice in January 2015 from the Large Business and International Division of the Internal Revenue Service (the “Service”) that the Company’s 2012 Federal Tax Return was selected for examination. The examination commenced in February 2015, and the Service concluded the examination of the Company's 2012 Federal Tax Return records in November 2015. The exam concluded with no material adjustments made to the Company's 2012 Federal Tax Return and no open items pending further action between the Company and the Service. As of December 31, 2015, 20142018, 2017 and 2013,2016, the Company had no material uncertain tax positions.
7.6. Long-Term Debt
Long-term debt consisted of the following as of December 31, 20152018 and 2014:2017:
  December 31,
  2015 2014
  (In thousands)
Deferred purchase payment 
$—
 
$150,000
Unamortized discount for deferred purchase payment 
 (1,100)
Senior Secured Revolving Credit Facility due 2018 
 
8.625% Senior Notes due 2018 
 600,000
Unamortized discount for 8.625% Senior Notes 
 (3,444)
7.50% Senior Notes due 2020 600,000
 600,000
Unamortized premium for 7.50% Senior Notes 1,251
 1,465
6.25% Senior Notes due 2023 650,000
 
Other long-term debt due 2028 4,425
 4,425
Long-term debt 
$1,255,676
 
$1,351,346
Deferred Purchase Payment
On October 24, 2014, the Company closed the Eagle Ford Shale Acquisition for an agreed upon purchase price of $250.0 million, net of post-closing and working capital adjustments. The deferred purchase payment of $150.0 million, net of post-closing and working capital adjustments was made in February 2015. The Company had the intent and ability to refinance this deferred purchase payment on a long-term basis with available capacity under its revolving credit facility, and accordingly, the deferred purchase payment was classified as long-term debt as of December 31, 2014. See “Note 4. Acquisition and Divestiture” for further discussion.
  December 31,
  2018 2017
  (In thousands)
Senior Secured Revolving Credit Facility due 2022 
$744,431
 
$291,300
7.50% Senior Notes due 2020 
 450,000
Unamortized premium for 7.50% Senior Notes 
 579
Unamortized debt issuance costs for 7.50% Senior Notes 
 (4,492)
6.25% Senior Notes due 2023 650,000
 650,000
Unamortized debt issuance costs for 6.25% Senior Notes (6,878) (8,208)
8.25% Senior Notes due 2025 250,000
 250,000
Unamortized debt issuance costs for 8.25% Senior Notes (3,962) (4,395)
Other long-term debt due 2028 
 4,425
Long-term debt 
$1,633,591
 
$1,629,209
Senior Secured Revolving Credit Facility
The Company has a senior secured revolving credit facility with a syndicate of banks that, as of December 31, 2015,2018, had a borrowing base of $685.0$1.3 billion, with an elected commitment amount of $1.1 billion, and borrowings outstanding of $744.4 million with no borrowings outstanding. Asat a weighted average interest rate of December 31, 2015, the Company also had $0.6 million in letters of credit outstanding, which would reduce the amounts available under the revolving credit facility.4.17%. The credit agreement governing the revolving credit facility provides for interest-only payments until July 2, 2018,May 4, 2022, when the credit agreement matures and any outstanding borrowings are due. The borrowing base under the credit agreement is subject to regular redeterminations in the Springspring and Fallfall of each year, as well as special redeterminations described in the credit agreement, which in each case which may reduce the amount of the borrowing base. The amount the Company is able to borrow with respect to the borrowing base is subject to compliance with the financial covenants and other provisions of the credit agreement. The capitalized terms which are not defined in this description of the revolving credit facility, shall have the meaning given to such terms in the credit agreement.


On January 31, 2018, as a result of the Eagle Ford divestiture, the Company’s borrowing base under the senior secured revolving credit facility was reduced from $900.0 million to $830.0 million, however, the elected commitment amount remained unchanged at $800.0 million. See “Note 3. Acquisitions and Divestitures of Oil and Gas Properties” for details of the Eagle Ford divestiture.
On May 4, 2018, the Company entered into the twelfth amendment to its credit agreement governing the revolving credit facility. Based on currently available bank pricing assumptions and current pricing differentials, drilling and completion plans, and reserve and cost assumptions, the Spring 2016 redetermination is expected to result in a reduction of the borrowing base.
On May 5, 2015, the Company entered into the sixth amendment to the senior secured revolving credit agreementfacility to, among other things, (i) establish an approvedthe borrowing base at $1.0 billion, with an elected commitment amount of $685.0$900.0 million, until the next redetermination thereof, (ii) establish a swing line commitment underreduce the revolving creditapplicable margins for Eurodollar loans from 2.00%-3.00% to 1.50%-2.50% and base rate loans from 1.00%-2.00% to 0.50%-1.50%, each depending on level of facility notusage, (iii) amend the covenant limiting payment of dividends and distributions on equity to exceed $15.0 millionincrease the Company’s ability to make dividends and (iii) include seven additional banks todistributions on its banking syndicate, bringing the total number of banks to 19equity interests and (iv) amend certain other provisions, in each case as of the date of such amendment.set forth therein.
On October 30, 2015,29, 2018, the Company entered into the sevenththirteenth amendment to the senior securedits credit agreement governing its revolving credit agreementfacility to, among other things, (i) reaffirmestablish the borrowing base at its current level$1.3 billion, with an elected commitment amount of $685.0 million$1.1 billion, until the next redetermination thereof, (ii) reduce the applicable margins for Eurodollar loans from 1.50%-2.50% to 1.25%-2.25% and (ii) amendbase rate loans from 0.50%-1.50% to 0.25%-1.25%, each depending on the financial covenant requiringlevel of facility usage and each subject to an increase of 0.25% for any period during which the maintenance of a ratio of Total Debt to EBITDA of not more than 4.00exceeds 3.00 to 1.00, such that(iii) amend the permissible ratio is increased to 4.75 to 1.00 through December 31, 2016, reducing to 4.375 to 1.00 through December 31, 2017,definition of Capital Leases, and returning to 4.00 to 1.00 thereafter.(iv) amend certain other definitions and provisions.
The obligations of the Company under the credit agreement are guaranteed by the Company’s material domestic subsidiaries and are secured by liens on substantially all of the Company’s assets, including a mortgage lien on oil and gas properties having at least 80%90% of the proved reservetotal value of the oil and gas properties included in the determination of the borrowing base.Company’s reserve report used in its most recent redetermination.

F-18



AmountsBorrowings outstanding under the credit agreement bear interest at the Company’s option at either (i) a base rate for a base rate loan plus the margin set forth in the table below, where the base rate is defined as the greatest of the prime rate, the federal funds rate plus 0.50% and the adjusted LIBO rate plus 1.00%, or (ii) an adjusted LIBO rate for a Eurodollar loan plus the margin set forth in the table below. The Company also incurs commitment fees at rates as set forth in the table below on the unused portion of lender commitments, and which are included as a componentin “Interest expense, net” in the consolidated statements of interest expense.operations.
Ratio of Outstanding Borrowings and Letters of Credit to Lender Commitments 
Applicable Margin for
Base Rate Loans
 
Applicable Margin for
Eurodollar Loans
 Commitment Fee
Ratio of Outstanding Borrowings to Lender Commitments 
Applicable Margin for
Base Rate Loans
 
Applicable Margin for
Eurodollar Loans
 Commitment Fee
Less than 25% 0.50% 1.50% 0.375% 0.25% 1.25% 0.375%
Greater than or equal to 25% but less than 50% 0.75% 1.75% 0.375% 0.50% 1.50% 0.375%
Greater than or equal to 50% but less than 75% 1.00% 2.00% 0.500% 0.75% 1.75% 0.500%
Greater than or equal to 75% but less than 90% 1.25% 2.25% 0.500% 1.00% 2.00% 0.500%
Greater than or equal to 90% 1.50% 2.50% 0.500% 1.25% 2.25% 0.500%
The Company is subject to certain covenants under the terms of the credit agreement, which include the maintenance of the following financial covenants determined as of the last day of each quarter: (1) a ratio of Total Debt to EBITDA (as defined in the credit agreement) of not more than 4.75 to 1.00 through December 31, 2016, reducing to 4.375 to 1.00 through December 31, 2017, and to 4.00 to 1.00 thereafter; and (2) a Current Ratio (as defined in the credit agreement) of not less than 1.00 to 1.00. As defined in the credit agreement, Total Debt excludes debt discounts and premiumsissuance costs and is net of cash and cash equivalents, EBITDA is forwill be calculated based on the last four fiscal quarters after giving pro forma effect to EBITDA for material acquisitions and dispositionsdivestitures of oil and gas properties, and the Current Ratio includes an add back of the unused portion of lender commitments. As of December 31, 2015,2018, the ratio of Total Debt to EBITDA was 2.672.41 to 1.00 and the Current Ratio was 3.631.51 to 1.00. Because the financial covenants are determined as of the last day of each quarter, the ratios can fluctuate significantly period to period as the amountslevel of borrowings outstanding under the credit agreement are dependent onimpacted by the timing of cash flows from operations, capital expenditures, acquisitions and dispositionsdivestitures of oil and gas properties and securities offerings.
The credit agreement also places restrictions on the Company and certain of its subsidiaries with respect to additional indebtedness, liens, dividends and other payments to shareholders, repurchases or redemptions of the Company’s common stock, redemptions of senior notes, investments, acquisitions and divestitures of oil and gas properties, mergers, asset dispositions, transactions with affiliates, hedging transactions and other matters.
The credit agreement is subject to customary events of default, including in connection with a change in control. If an event of default occurs and is continuing, the lenders may elect to accelerate amounts due under the credit agreement (except in the case of a bankruptcy event of default, in which case such amounts will automatically become due and payable).
8.625%Senior Notes
8.25% Senior Notes due 2018
2025.On November 2, 2010, the Company issued $400.0 million aggregate principal amount of 8.625% Senior Notes due 2018 in a private placement. On November 17, 2011, the Company issued an additional $200.0 million aggregate principal amount of 8.625% Senior Notes in a private placement. These notes were issued as “additional notes” under the indenture governing the 8.625% Senior Notes pursuant to which the Company had previously issued $400.0 million aggregate principal amount of 8.625% Senior Notes in November 2010, and under the indenture are treated as a single series with substantially identical terms as the 8.625% Senior Notes previously issued in November 2010. In June 2011 and February 2012, the Company completed the exchange of registered 8.625% Senior Notes for any and all of its then unregistered $400.0 million and $200.0 million aggregate principal amount of 8.625% Senior Notes, respectively.
On AprilJuly 14, 2015, the Company settled a cash tender offer for any or all of the outstanding $600.0 million aggregate principal amount of its 8.625% Senior Notes. The tender offer expired on April 23, 2015. On April 28, 2015, the Company made an aggregate cash payment of $276.4 million for the $264.2 million aggregate principal amount of 8.625% Senior Notes validly tendered in the tender offer. This represented a tender offer premium totaling $12.2 million, equal to $1,046.13 for each $1,000 principal amount of 8.625% Senior Notes validly tendered and accepted for payment pursuant to the tender offer. In addition, all 8.625% Senior Notes accepted for payment received accrued and unpaid interest of $0.8 million from the last interest payment date up to, but not including, the settlement date.
In connection with the cash tender offer, the Company also sent a notice of redemption to the trustee for its 8.625% Senior Notes to conditionally call for redemption on May 14, 2015 all of the 8.625% Senior Notes then outstanding, conditioned upon and subject to the Company receiving specified net proceeds from one or more securities offerings, which conditions were satisfied. On May 14, 2015, the Company paid an aggregate redemption price of $352.6 million, including a redemption premium of $14.5 million, which represented 104.313% of the principal amount of the then outstanding 8.625% Senior Notes (or $1,043.13 for each $1,000 principal amount of the 8.625% Senior Notes) plus accrued and unpaid interest of $2.3 million from the last interest payment date up to, but not including, the redemption date, to redeem the then outstanding $335.8 million aggregate principal amount of

F-19



8.625% Senior Notes. As a result of the cash tender offer and the redemption of the 8.625% Senior Notes, the Company recorded a loss on extinguishment of debt of $38.1 million during the second quarter of 2015, which includes the premium paid to repurchase the 8.625% Senior Notes of $26.7 million and non-cash charges of $11.4 million attributable to the write-off of unamortized debt issuance costs and the remaining discount associated with the 8.625% Senior Notes.
7.50% Senior Notes due 2020
On September 10, 2012, the Company issued in a public offering $300.0 million aggregate principal amount of 7.50% Senior Notes due 2020. On October 30, 2014, the Company issued in a private placement an additional $300.0 million aggregate principal amount of 7.50% Senior Notes due 2020 at a price to the initial purchasers of 100.5% of par. In February 2015, the Company completed an exchange offer registered under the Securities Act of 1933, as amended, whereby registered 7.50% Senior Notes were exchanged for such privately placed 7.50% Senior Notes. The privately placed 7.50% Senior Notes have substantially identical terms, other than with respect to certain transfer restrictions and registration rights, as the exchanged 7.50% Senior Notes and our 7.50% Senior Notes that were issued on September 10, 2012.
The Company may redeem all or a portion of the 7.50% Senior Notes at any time on or after September 15, 2016 at redemption prices decreasing from 103.75% to 100% of the principal amount on September 15, 2018, plus accrued and unpaid interest. Prior to September 15, 2016, the Company may redeem all or part of the 7.50% Senior Notes at 100% of the principal amount thereof, plus accrued and unpaid interest and a make whole premium (as defined in the indenture governing the original 7.50% Senior Notes). If a Change of Control (as defined in the indenture governing the original 7.50% Senior Notes) occurs, the Company may be required by holders to repurchase the 7.50% Senior Notes for cash at a price equal to 101% of the principal amount, plus any accrued and unpaid interest.
6.25% Senior Notes due 2023
On April 28, 2015,2017, the Company closed a public offering of $650.0$250.0 million aggregate principal amount of 6.25%8.25% Senior Notes due 2023. The Company received proceeds of approximately $640.3 million, net of underwriting discounts2025 (the “8.25% Senior Notes”), which mature on July 15, 2025 and commissions. The net proceeds were used to fund the repurchase and redemption of the 8.625% Senior Notes described above as well as to temporarily repay borrowings outstanding under the Company’s revolving credit facility. The 6.25% Senior Notes bearhave interest at 6.25% per annum which is payable semi-annually on each AprilJanuary 15 and OctoberJuly 15. Before July 15, and mature on April 15, 2023. Before April 15, 2018,2020, the Company may, at its option, redeem all or a portion of the 6.25%8.25% Senior Notes at 100% of the principal amount plus accrued and unpaid interest and a make-whole premium. Thereafter,


the Company may redeem all or a portion of the 8.25% Senior Notes at redemption prices decreasing annually from 106.188% to 100% of the principal amount redeemed plus accrued and unpaid interest. The Company used the net proceeds of $245.4 million, net of underwriting discounts and commissions and offering costs, to fund a portion of the purchase price for the ExL Acquisition that closed during the third quarter of 2017 and for general corporate purposes.
6.25% Senior Notes due 2023. Since April 15, 2018, the Company has had the right to redeem all or a portion of the 6.25% Senior Notes due 2023 (the “6.25% Senior Notes”) at redemption prices decreasing from 104.688% to 100% of the principal amount on April 15, 2018,2021, plus accrued and unpaid interest. The 6.25% Senior Notes were guaranteed by
If a Change of Control (as defined in the same subsidiaries that also guaranteeindentures governing the 7.50%8.25% Senior Notes and the revolving credit facility.6.25% Senior Notes) occurs, the Company may be required by holders to repurchase the 8.25% Senior Notes and the 6.25% Senior Notes for cash at a price equal to 101% of the principal amount purchased, plus any accrued and unpaid interest.
The indentures governing the 7.50%8.25% Senior Notes and the 6.25% Senior Notes contain covenants that, among other things, limit the Company’s ability and the ability of its restricted subsidiaries to: pay distributions on, purchase or redeem the Company’s common stock or other capital stock or redeem the Company’s subordinated debt; make investments; incur or guarantee additional indebtedness or issue certain types of equity securities; create certain liens; sell assets; consolidate, merge or transfer all or substantially all of the Company’s assets; enter into agreements that restrict distributions or other payments from the Company’s restricted subsidiaries to the Company; engage in transactions with affiliates; and create unrestricted subsidiaries. Such indentures governing the Company’s senior notes are also subject to customary events of default, including those related to failure to comply with the terms of the notes and the indenture, certain failures to file reports with the SEC, certain cross defaults of other indebtedness and mortgages and certain failures to pay final judgments. At December 31, 2015,2018, the 7.50%8.25% Senior Notes and the 6.25% Senior Notes wereare guaranteed by all of the Company’s existing Material Domestic Subsidiaries (as defined in the credit agreement governingsame subsidiaries that also guarantee the revolving credit facility).facility.

Redemptions of 7.50% Senior Notes
F-20During the fourth quarter of 2017, the Company redeemed $150.0 million of the outstanding aggregate principal amount of its 7.50% Senior Notes at a price equal to 101.875% of par, plus accrued and unpaid interest. The Company paid $156.0 million upon the redemption, which included a redemption premium of $2.8 million and accrued and unpaid interest of $3.2 million. As a result of the redemption, the Company recorded a loss on extinguishment of debt of $4.2 million, which included the redemption premium of $2.8 million and the write-off of associated unamortized premiums and debt issuance costs of $1.4 million.
During the first and fourth quarters of 2018, the Company redeemed $320.0 million of the outstanding aggregate principal amount of its 7.50% Senior Notes at a price equal to 101.875% of par and the remaining $130.0 million outstanding aggregate principal amount at a redemption price of 100% of par, respectively, both plus accrued and unpaid interest. The Company paid a total of $468.6 million upon the redemptions, which included redemption premiums of $6.0 million and accrued and unpaid interest of $12.6 million. As a result of the redemptions, the Company recorded a loss on extinguishment of debt of $9.6 million, which included the redemption premiums of $6.0 million and the write-off of associated unamortized premiums and debt issuance costs of $3.6 million.

Redemption of Other Long-Term Debt
On May 3, 2018, the Company redeemed the remaining $4.4 million outstanding aggregate principal amount of its 4.375% Convertible Senior Notes due 2028 at a price equal to 100% of par. Upon the redemption, the Company paid $4.5 million, which included accrued and unpaid interest of $0.1 million.



8.7. Asset Retirement Obligations
The following table sets forth a reconciliation of the Company’s asset retirement obligations for the years ended December 31, 20152018 and 2014:2017:
  Years Ended December 31,
  2015 2014
  (In thousands)
Asset retirement obligations at beginning of period 
$12,512
 
$7,356
Liabilities incurred 3,227
 6,284
Increase due to acquisition of oil and gas properties 
 423
Liabilities settled (1,966) (1,784)
Accretion expense 1,112
 710
Revisions of previous estimates (1) 1,626
 (477)
Asset retirement obligations at end of period 16,511
 12,512
Current portion of asset retirement obligations included in “Other current liabilities” (328) (325)
Long-term asset retirement obligations 
$16,183
 
$12,187
  Years Ended December 31,
  2018 2017
  (In thousands)
Asset retirement obligations, beginning of period 
$23,792
 
$21,240
Liabilities incurred 1,676
 3,920
Increase due to acquisition of oil and gas properties 170
 153
Liabilities settled ���
 (343)
Reduction due to divestitures of oil and gas properties (8,547) (2,671)
Accretion expense 1,366
 1,799
Revisions to estimated cash flows 245
 (306)
Asset retirement obligations, end of period 18,702
 23,792
Current asset retirement obligations (included in other current liabilities) (342) (295)
Non-current asset retirement obligations 
$18,360
 
$23,497
(1)Revisions of previous estimates during the year ended December 31, 2015 are primarily attributable to increased estimates of future costs for oilfield services required to plug and abandon certain wells located in the Gulf Coast region.
9.8. Commitments and Contingencies
From time to time, the Company is party to certain legal actions and claims arising in the ordinary course of business. Pursuant to various purchase and sale agreements related to our divested assets in the Eagle Ford Shale, Marcellus Shale, Utica Shale, and Niobrara Formation, the Company has indemnified the respective purchasers against certain liabilities that they may incur with respect to the assets acquired from the Company. The Company believes such indemnities are customary in purchase and sale transactions in our industry.  Such indemnities may include, among others, breach of representations and warranties, tax liabilities, employee compensation, litigation, personal injury, transport or disposal of hazardous substances, calculation and payments of royalties, environmental matters and rights-of-way. 
While the outcome of these events cannot be predicted with certainty, as of December 31, 2018, management does not currently expect these mattersindemnifications to have a materially adverse effect on the financial position or results of operations of the Company.
The financial position and results of operations and financial position of the Company continue to be affected from time to time in varying degrees by domestic and foreign political developments as well as legislation and regulations pertaining to restrictions on oil and gas production, imports and exports, natural gas regulation, tax increases,changes, environmental regulations and cancellation of contract rights. bothBoth the likelihood and overall effect of such occurrences on the Company vary greatly and are not predictable.
Rent expense included in general and administrative expense, net for the years ended December 31, 2015, 20142018, 2017 and 20132016 was $2.2$1.4 million, $1.9$1.7 million, and $1.9$2.0 million, respectively, and includes rent expense primarily for the Company’s corporate office and field offices. At December 31, 2015,The table below presents total minimum commitments fromassociated with long-term, non-cancelable operating and capital leases, drilling rigsrig contracts and pipeline volumegathering, processing and transportation service agreements, which require minimum volumes of natural gas or produced water to be delivered, as of December 31, 2018.
 2019 2020 2021 2022 2023 2024 and Thereafter Total
 (In thousands)
Operating leases
$10,024
 
$9,154
 
$6,249
 
$3,639
 
$3,680
 
$20,978
 
$53,724
Drilling rig contracts (1)
37,077
 16,867
 813
 
 
 
 54,757
Delivery commitments (2)
3,726
 2,807
 2,487
 30
 7
 19
 9,076
Produced water disposal commitments (3)
18,139
 20,894
 20,898
 20,954
 10,471
 9,769
 101,125
Other1,800
 1,050
 
 
 
 
 2,850
Total
$70,766
 
$50,772
 
$30,447
 
$24,623
 
$14,158
 
$30,766
 
$221,532
(1)Drilling rig contracts represent gross contractual obligations and accordingly, other joint owners in the properties operated by us will generally be billed for their working interest share of such costs.
(2)Delivery commitments represent contractual obligations we have entered into for certain gathering, processing and transportation service agreements which require minimum volumes of natural gas to be delivered. The amounts in the table above reflect the aggregate undiscounted deficiency fees assuming no delivery of any natural gas.


(3)Produced water disposal commitments represent contractual obligations we have entered into for certain service agreements which require minimum volumes of produced water to be delivered. The amounts in the table above reflect the aggregate undiscounted deficiency fees assuming no delivery of any produced water.
9. Preferred Stock and Common Stock Warrants
On August 20, 2017, the Company closed on the issuance and sale in a private placement of (i) $250.0 million initial liquidation preference (250,000 shares) of 8.875% redeemable preferred stock, par value $0.01 per share (the “Preferred Stock”) and (ii) warrants for 2,750,000 shares of the Company’s common stock, with a term of ten years and an exercise price of $16.08 per share, exercisable only on a net share settlement basis (the “Warrants”), for a cash purchase price equal to $970.00 per share of Preferred Stock to certain funds managed or sub-advised by GSO Capital Partners LP and its affiliates (the “GSO Funds”). The closing occurred contemporaneously with the closing of the ExL Acquisition. The Company used the proceeds of approximately $236.4 million, net of issuance costs to fund a portion of the purchase price for the ExL Acquisition and for general corporate purposes.
Net proceeds were allocated between the Preferred Stock and the Warrants based on their relative fair values at the issuance date, with $213.4 million allocated to the Preferred Stock and $23.0 million allocated to the Warrants. The fair value of the Preferred Stock was calculated by a third-party valuation specialist using a discounted cash flow model. Significant inputs into the calculation included the per share cash purchase price, redemption premiums, and liquidation preference, all as discussed further below, as well as redemption assumptions provided by the Company. The fair value of the Warrants was calculated using a Black-Scholes-Merton option pricing model, incorporating the following assumptions at the issuance date:
Issuance Date Fair Value Assumptions
Exercise price$16.08
Expected term (in years)10.0
Expected volatility62.9%
Risk-free interest rate2.2%
Dividend yield%
See “Note 13. Fair Value Measurements” for further discussion of the significant inputs used in the Preferred Stock fair value calculation.
The Preferred Stock is presented as temporary equity in the consolidated balance sheets with the issuance date fair value accreted to the initial liquidation preference using the effective interest method. The Warrants are presented in “Additional paid-in capital” in the consolidated balance sheets at their issuance date fair value.
The following table sets forth a reconciliation of changes in the carrying amount of Preferred Stock for the years ended December 31, 2018 and 2017:
  Years Ended December 31,
  2018 2017
  (In thousands)
Preferred Stock, beginning of period 
$214,262
 
$—
Relative fair value at issuance 
 213,400
Redemption of Preferred Stock (42,897) 
Accretion on Preferred Stock 3,057
 862
Preferred Stock, end of period 
$174,422
 
$214,262
The Preferred Stock has a liquidation preference of $1,000.00 per share and bears an annual cumulative dividend rate of 8.875%, payable on March 15, June 15, September 15 and December 15 of any given year. The Company may elect to pay all or a portion of the Preferred Stock dividends in shares of its common stock in decreasing percentages as shownfollows with respect to any preferred stock dividend declared by the Company’s Board of Directors and paid in respect of a quarter ending:
PeriodPercentage
On or after December 15, 2018 and on or prior to September 15, 201975%
On or after December 15, 2019 and on or prior to September 15, 202050%
If the Company fails to satisfy the Preferred Stock dividend on the applicable dividend payment date, then the unpaid dividend will be added to the liquidation preference until paid.
The Preferred Stock outstanding is not mandatorily redeemable, but can be redeemed at the Company’s option and, in certain circumstances, at the option of the holders of the Preferred Stock. On or prior to August 10, 2018, the Company had the right to redeem up to 50,000 shares of Preferred Stock, in cash, at $1,000.00 per share, plus accrued and unpaid dividends in an amount


not to exceed the sum of the cash proceeds of divestitures of oil and gas properties and related assets, the sale or issuance of the Company’s common stock and the sale of any of the Company’s wholly owned subsidiaries.
In addition, at any time on or prior to August 10, 2020, the Company may redeem all or part of the Preferred Stock in cash at a redemption premium of 104.4375%, plus accrued and unpaid dividends and the present value on the redemption date of all quarterly dividends that would be payable from the redemption date through August 10, 2020. After August 10, 2020, the Company may redeem all or part of the Preferred Stock in cash at redemption premiums, as presented in the table below. The total minimum commitments related to the drilling rigs represent gross contractual obligations and accordingly, other joint owners in the properties operated by the Company will generally be billed for their working interest share of such costs.below, plus accrued but unpaid dividends.
 2016 2017 2018 2019 2020 2021 and Thereafter Total
 (In thousands)
Operating leases
$4,055
 
$4,185
 
$4,248
 
$4,357
 
$4,450
 
$6,304
 
$27,599
Capital leases1,733
 1,733
 1,700
 1,677
 978
 
 7,821
Drilling rig contracts24,261
 20,513
 3,957
 
 
 
 48,731
Pipeline volume commitments8,596
 7,474
 7,474
 6,141
 3,651
 5,431
 38,767
Total
$38,645
 
$33,905
 
$17,379
 
$12,175
 
$9,079
 
$11,735
 
$122,918
PeriodPercentage
After August 10, 2020 but on or prior to August 10, 2021104.4375%
After August 10, 2021 but on or prior to August 10, 2022102.21875%
After August 10, 2022100%
The holders of the Preferred Stock have the option to cause the Company to redeem the Preferred Stock under the following conditions:
Upon the Company’s failure to pay a quarterly dividend within three months of the applicable payment date;
On or after August 10, 2024, if the Preferred Shares remain outstanding; or
Upon the occurrence of certain changes of control.
For the first two conditions described above, the Company has the option to settle any such redemption in cash or shares of its common stock and the holders of the Preferred Stock may elect to revoke or reduce the redemption if the Company elects to settle in shares of common stock.
The Preferred Stock are non-voting shares except as required by the Company’s articles of incorporation or bylaws. However, so long as the GSO Funds beneficially own more than 50% of the Preferred Stock, the consent of the holders of the Preferred Stock will be required prior to issuing stock senior to or on parity with the Preferred Stock, incurring indebtedness subject to a leverage ratio, agreeing to certain restrictions on dividends on, or redemption of, the Preferred Stock and declaring or paying dividends on the Company’s common stock in excess of $15.0 million per year subject to a leverage ratio. Additionally, if the Company does not redeem the Preferred Stock before August 10, 2024, in connection with a change of control or failure to pay a quarterly dividend within three months of the applicable payment date, the holders of the Preferred Stock are entitled to additional rights including:
Increasing the dividend rate to 12.0% per annum until August 10, 2024 and thereafter to the greater of 12.0% per annum and the one-month LIBOR plus 10.0%;
Electing up to two directors to the Company’s Board of Directors; and
Requiring approval by the holders of the Preferred Stock to incur indebtedness subject to a leverage ratio, declaring or paying dividends on the Company’s common stock in excess of $15.0 million per year or issuing equity of the Company’s subsidiaries to third parties.
Loss on Redemption of Preferred Stock
During the first quarter of 2018, the Company redeemed 50,000 shares of Preferred Stock, representing 20% of the issued and outstanding Preferred Stock, for $50.5 million, consisting of the $50.0 million redemption price and accrued and unpaid dividends of $0.5 million. The Company recognized a $7.1 million loss on the redemption due to the excess of the $50.0 million redemption price over the $42.9 million redemption date carrying value of the Preferred Stock.
10. Shareholders’ Equity
Increase in Authorized Common Shares
At the Company’s annual meeting of shareholders on May 16, 2017, shareholders approved an amendment to the Company’s Amended and Stock Incentive PlansRestated Articles of Incorporation to increase the number of authorized shares of common stock from 90,000,000 to 180,000,000.
Sales of Common Stock Offerings
On March 20, 2015,August 17, 2018, the Company completed a public offering of 5.29.5 million shares of its common stock at a price of $44.75 per share forof $22.55. The Company used the proceeds of $231.3$213.7 million, net of offering costs. Thecosts, to fund the Devon Acquisition and for general corporate purposes. Pending the closing of the Devon Acquisition, the Company used the net proceeds from the common stock offering to temporarily repay a portion of the borrowings outstanding under the Company’s revolving credit facility and for general corporate purposes.facility.


On October 21, 2015,July 3, 2017, the Company completed a public offering of 6.315.6 million shares of its common stock at a price of $37.80 per share forof $14.28. The Company used the proceeds of $238.8$222.4 million, net of offering costs. The Company usedcosts, to fund a portion of the net proceeds from the common stock offering to repay borrowings under the Company’s revolving credit facilityExL Acquisition and for general corporate purposes.

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Exercise of Warrants
On November 24, 2009,October 28, 2016, the Company entered into an agreement with an unrelated third party and its affiliate under which the Company issued 118,200 warrants to purchasecompleted a public offering of 6.0 million shares of its common stock at a price per share of $37.32. The Company used the Company’s common stock. In May 2015,proceeds of $223.7 million, net of offering costs, to fund the holdersSanchez Acquisition and repay borrowings under the revolving credit facility. See “Note 3. Acquisitions and Divestitures of Oil and Gas Properties” for further details of the warrants exercised all warrants outstanding on a “cashless” basis at an exercise priceExL Acquisition.
See “Note 3. Acquisitions and Divestitures of $22.09 resulting in the issuance of 71,913 sharesOil and Gas Properties” for further details of the Company’s common stock.acquisitions discussed above.
11. Stock-Based Compensation Plans
The Company has establishedEquity-based incentive awards are granted under the 2017 Incentive Plan of Carrizo Oil & Gas, Inc., as amended (the “Incentive“2017 Incentive Plan”), which authorizes the granting of stock options, SARs that may be settled in cash or common stock at the option of the Company, restricted stock awards, restricted stock units and performance share awards to employees and independent contractors. The Incentive Plan also authorizes the granting of stock options, restricted stock awards and restricted stock units to directors. On May 15, 2014, the Incentive Plan was amended and restated, to increase the number of shares available for issuance under the Incentive Plan. The Company may grant awards covering up to 10,822,500 shares (subject to certain limitations) under the Incentive Plan, and at December 31, 2015, there were 3,861,389 common shares remaining available for grant under the Incentive Plan.
The Company has also established the Carrizo Oil & Gas, Inc. Cash-Settled Stock Appreciation Rights Plan (“Cash SAR Plan”). The 2017 Incentive Plan replaced the Incentive Plan of Carrizo Oil & Gas, Inc., as amended and restated effective May 15, 2014 (the “Prior Incentive Plan”) and, from the effective date of the 2017 Incentive Plan, no further awards may be granted under the Prior Incentive Plan. However, awards previously granted under the Prior Incentive Plan will remain outstanding in accordance with their terms. Under the 2017 Incentive Plan, the Compensation Committee of the Board of Directors (the “Committee”) may grant restricted stock awards and units, stock appreciation rights that can be settled in cash or shares of common stock, performance shares, and stock options to employees, independent contractors, and non-employee directors. Under the Cash SAR Plan, authorizes the granting of SARs to employees and independent contractorsCommittee may grant stock appreciation rights that may only be settled in cash.cash to employees and independent contractors.
Restricted Stock Awards and Units. The Company grants2017 Incentive Plan provides that up to 2,675,000 shares of the Company’s common stock, plus the shares remaining available for awards under the Prior Incentive Plan at the effective date of the 2017 Incentive Plan, may be granted (the “Maximum Share Limit”). Each restricted stock awardsaward and units to employees, independent contractorsunit and directors. Restrictedperformance share granted under the 2017 Incentive Plan counts as 1.35 shares against the Maximum Share Limit. Each stock awards are treated as issuedoption and outstanding as of the grant date because the shares of common stock are issued in the name of employees, but held by the Company until the restrictions are satisfied. Although the shares of common stock are not issued to employees until vesting, during the restriction period, the terms of the award agreement provide employees and their permitted transferees theappreciation right to vote on their unvested shares. Restricted stock units do not have the right to vote on unvested shares and are not considered issued and outstanding until the shares of common stock are issued to the employee upon vesting. Restricted stock units are payable, at the Company’s option, eitherbe settled in shares of common stock orgranted under the 2017 Incentive Plan counts as a cash payment equivalent1.00 share against the Maximum Share Limit. Cash SARs granted under the 2017 Incentive Plan and the Cash SAR Plan do not count against the Maximum Share Limit. There have been no grants of stock appreciation rights to the fair market value of a sharebe settled in shares of common stock on the vesting date. Most restrictedand there are no outstanding stock awards and units contain a service condition, and certain restricted stock units also contain performance conditions. All performance conditions have been met for all awards outstanding atoptions. As of December 31, 2015. 2018, there were 258,785 shares of common stock available for grant under the 2017 Incentive Plan.
Restricted Stock Awards and Units
The table below summarizes restricted stock award and unit activity for the years ended December 31, 2015, 20142018, 2017 and 2013:2016:
 Restricted Stock Awards and Units 
Weighted Average Grant Date
Fair Value
 Restricted Stock Awards and Units 
Weighted Average Grant Date
Fair Value
For the Year Ended December 31, 2013    
For the Year Ended December 31, 2016    
Unvested restricted stock awards and units, beginning of period 1,146,274
 
$26.95
 1,041,997
 
$44.22
Granted 932,763
 
$28.16
 887,254
 
$27.80
Vested (557,136) 
$25.98
 (811,136) 
$36.32
Forfeited (77,034) 
$26.03
 (6,405) 
$34.46
Unvested restricted stock awards and units, end of period 1,444,867
 
$28.03
 1,111,710
 
$36.93
For the Year Ended December 31, 2014    
For the Year Ended December 31, 2017    
Unvested restricted stock awards and units, beginning of period 1,444,867
 
$28.03
 1,111,710
 
$36.93
Granted 576,812
 
$48.64
 1,020,465
 
$25.63
Vested (647,306) 
$32.64
 (635,965) 
$39.62
Forfeited (38,691) 
$32.89
 (13,555) 
$29.11
Unvested restricted stock awards and units, end of period 1,335,682
 
$34.55
 1,482,655
 
$28.07
For the Year Ended December 31, 2015    
For the Year Ended December 31, 2018    
Unvested restricted stock awards and units, beginning of period 1,335,682
 
$34.55
 1,482,655
 
$28.07
Granted 401,421
 
$51.45
 1,458,421
 
$15.49
Vested (671,417) 
$32.96
 (621,399) 
$31.48
Forfeited (23,689) 
$43.36
 (53,010) 
$17.72
Unvested restricted stock awards and units, end of period 1,041,997
 
$44.22
 2,266,667
 
$19.28
Grant activity primarily consisted of restricted stock units to employees and independent contractors as part of the annual grant of long-term equity incentive awards that occurred in the first quarter of each of the years presented in the table above and vest ratably over an approximate three-year period. As of December 31, 2018, unrecognized compensation costs related to unvested


restricted stock awards and units was $23.2 million and will be recognized over a weighted average period of 1.9 years. The aggregate fair value of restricted stock awards and units that vested during the years ended December 31, 2015, 20142018, 2017 and 20132016 was $32.0$10.2 million, $37.3$20.3 million and $16.0$26.3 million, respectively.
Cash SARs
The table below summarizes the Cash SAR activity for the years ended December 31, 2018, 2017 and 2016:
  Stock Appreciation Rights 
Weighted
Average
Exercise
Prices
 
Weighted Average Remaining Life
(In years)
 
Aggregate Intrinsic Value
(In millions)
 
Aggregate Intrinsic Value of Exercises
(In millions)
For the Year Ended December 31, 2016          
Outstanding, beginning of period 700,453
 
$21.86
      
Granted 376,260
 
$27.30
      
Exercised (354,075) 
$23.89
     
$5.2
Forfeited 
 
      
Expired 
 
      
Outstanding, end of period 722,638
 
$23.69
      
Vested, end of period 350,840
 
$19.87
      
Vested and exercisable, end of period 350,840
 
$19.87
      
For the Year Ended December 31, 2017          
Outstanding, beginning of period 722,638
 
$23.69
      
Granted 342,440
 
$26.94
      
Exercised (219,279) 
$17.28
     
$2.1
Forfeited 
 
      
Expired (131,561) 
$24.19
      
Outstanding, end of period 714,238
 
$27.12
      
Vested, end of period 185,899
 
$27.30
      
Vested and exercisable, end of period 
 
$27.30
      
For the Year Ended December 31, 2018          
Outstanding, beginning of period 714,238
 
$27.12
      
Granted 616,686
 
$14.67
      
Exercised 
 
     
$—
Forfeited 
 
      
Expired 
 
      
Outstanding, end of period 1,330,924
 
$21.35
 4.3 
$—
  
Vested, end of period 543,018
 
$27.18
      
Vested and exercisable, end of period 
 
$27.18
 2.5 
$—
  
Grant activity primarily consisted of Cash SARs to certain employees and independent contractors as part of the annual grant of long-term equity incentive awards that occurred in the first quarter of each of the years presented in the table above. The Cash SARs granted during the year ended December 31, 2018 vest ratably over an approximate three year period and expire approximately seven years from the grant date. The Cash SARs granted during the years ended December 31, 2017 and 2016 vest ratably over an approximate two year period and expire approximately five years from the grant date.


The grant date fair value of the Cash SARs, calculated using the Black-Scholes-Merton option pricing model, was $4.9 million, $4.1 million, and $3.7 million for the years ended December 31, 2018, 2017, and 2016, respectively. The following table summarizes the assumptions used and the resulting grant date fair value per Cash SAR granted during the years ended December 31, 2018, 2017, and 2016:
  Years Ended December 31,
  2018 2017 2016
Expected term (in years) 6.0
 4.2
 3.9
Expected volatility 54.3% 54.3% 45.1%
Risk-free interest rate 2.8% 1.8% 1.3%
Dividend yield % % %
Grant date fair value per Cash SAR $7.89 $12.00 $9.88
The liability for Cash SARs as of December 31, 2018 and 2017 was $1.8 million and $4.4 million, respectively, all of which was classified as “Other current liabilities” in the consolidated balance sheets in the respective period. Unrecognized compensation costs related to unvested Cash SARs were $2.4 million as of December 31, 2018, and will be recognized over a weighted average period of 2.2 years.
Performance Shares
The table below summarizes performance share activity for the years ended December 31, 2018, 2017 and 2016:
  
Target Performance Shares (1)
 
Weighted Average Grant Date
Fair Value
For the Year Ended December 31, 2016    
Unvested performance shares, beginning of period 112,859
 
$66.83
Granted 41,651
 
$35.71
Vested at end of performance period 
 
Forfeited 
 
Unvested performance shares, end of period 154,510
 
$58.44
For the Year Ended December 31, 2017    
Unvested performance shares, beginning of period 154,510
 
$58.44
Granted 46,787
 
$35.14
Vested at end of performance period (56,342) 
$68.15
Forfeited 
 
Unvested performance shares, end of period 144,955
 
$47.14
For the Year Ended December 31, 2018    
Unvested performance shares, beginning of period 144,955
 
$47.14
Granted 93,771
 
$19.09
Vested at end of performance period (49,458) 
$65.51
Did not vest at end of performance period (7,059) 
$65.51
Forfeited 
 
Unvested performance shares, end of period 182,209
 
$27.01
(1)
The number of performance shares that vest may vary from the number of target performance shares granted depending on the Companys final TSR ranking for the approximate three-year performance period.
Grant activity primarily consisted of performance shares to certain employees and independent contractors as part of the annual grant of long-term equity incentive awards that occurred in the first quarter of each of the years presented in the table above.
For the year ended December 31, 2018, as a result of the Company’s final TSR ranking during the performance period, a multiplier of 88% was applied to the 56,517 target performance shares that were granted in 2015, resulting in the vesting of 49,458 shares and 7,059 shares that did not vest. For the year ended December 31, 2017, as a result of the Company’s final TSR ranking during the performance period, a multiplier of 164% was applied to the 56,342 target performance shares that were granted in 2014, resulting in the vesting of 92,200 shares. The Company did not have any performance shares that vested during the year ended December 31, 2016. The aggregate fair value of performance shares that vested during the years ended December 31, 2018 and 2017 was $0.8 million and $2.6 million, respectively.


For the years ended December 31, 2018, 2017 and 2016, the grant date fair value of the performance shares, calculated using a Monte Carlo simulation, was $1.8 million, $1.6 million, and $1.5 million, respectively. The following table summarizes the assumptions used and the resulting grant date fair value per performance share granted during the years ended December 31, 2018, 2017 and 2016:
  Years Ended December 31,
  2018 2017 2016
Number of simulations 500,000
 500,000
 500,000
Expected term (in years) 3.0
 3.0
 3.0
Expected volatility 61.5% 59.2% 55.3%
Risk-free interest rate 2.4% 1.5% 1.2%
Dividend yield % % %
Grant date fair value per performance share $19.09 $35.14 $35.71
As of December 31, 2015,2018, unrecognized compensation costs related to unvested restricted stock awards and units was $20.8performance shares were $2.1 million and will be recognized over a weighted average period of 1.71.8 years.

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Stock Appreciation Rights. Employees and independent contractors have been or may by granted SARs under the Incentive Plan or Cash SAR Plan, representing the right to receive shares of common stock or cash, at the option of the Company, based on the appreciation in the stock price from the grant date price of the SAR. All SARs contain service and performance conditions. The performance conditions have been met for all SARs outstanding at December 31, 2015. The table below summarizes the activity for SARs for the years ended December 31, 2015, 2014 and 2013:
  Stock Appreciation Rights 
Weighted
Average
Exercise
Prices
 
Weighted Average Remaining Life
(In years)
 
Aggregate Intrinsic Value
(In millions)
 
Aggregate Intrinsic Value of Exercises
(In millions)
For the Year Ended December 31, 2013          
Outstanding, beginning of period 1,035,823
 
$22.69
      
Granted 282,296
 
$28.68
      
Exercised (207,184) 
$19.30
     
$3.9
Forfeited (24,704) 
$27.77
      
Outstanding, end of period 1,086,231
 
$24.78
      
Exercisable, end of period 681,867
 
$22.55
      
For the Year Ended December 31, 2014          
Outstanding, beginning of period 1,086,231
 
$24.78
      
Granted 
 
      
Exercised (321,033) 
$30.24
     
$7.8
Forfeited 
 
      
Outstanding, end of period 765,198
 
$22.49
      
Exercisable, end of period 587,481
 
$20.78
      
For the Year Ended December 31, 2015          
Outstanding, beginning of period 765,198
 
$22.49
      
Granted 
 
      
Exercised (64,745) 
$29.40
     
$1.5
Forfeited 
 
      
Outstanding, end of period 700,453
 
$21.86
 1.1 
$5.1
  
Exercisable, end of period 626,661
 
$21.05
 1.1 
$5.0
  
As of December 31, 2015, the liability for SARs was $7.0 million, which is classified as “Other current liabilities”, on the consolidated balance sheets. As of December 31, 2014, the liability for SARs outstanding was $14.8 million, of which $13.9 million was classified as “Other current liabilities” with the remaining $0.9 million classified as “Other liabilities”.
As of December 31, 2015, unrecognized compensation costs related to unvested SARs was $0.1 million and will be recognized over a weighted average period of 0.4 years.
The Company used the Black-Scholes-Merton option pricing model to compute the grant date fair value of SARs. The following table summarizes the assumptions used to calculate the fair value of SARs granted during 2013:
Year Ended December 31, 2013
Stock price on the date of grant$13.36
Volatility factor44.5%
Dividend yield%
Risk-free interest rate1.0%
Expected term (in years)3.5
Performance Share Awards. The Company grants performance share awards to employees and independent contractors, where each performance share represents the value of one share of common stock. Performance share awards are payable, at the Company’s option, either in shares of common stock or as a cash payment equivalent to the fair market value of a share of common stock on the vesting date. The number of performance shares that will vest is subject to a market condition, which is based on the total shareholder return (“TSR”) of the Company’s common stock relative to the TSR achieved by a defined peer group over the three year performance period. The range of performance shares which may be earned by an award recipient ranges from zero and 200% of the performance shares granted depending on the Company’s TSR as compared to the peer group at the end of the performance

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period, which is also the vesting date. The performance share awards also contain service and performance conditions. The performance conditions have been met for all performance share awards outstanding at December 31, 2015. The table below summarizes performance share award activity for the years ended December 31, 2015 and 2014:
  Performance Share Awards 
Weighted Average Grant Date
Fair Value
For the Year Ended December 31, 2014    
Unvested performance share awards, beginning of period 
 
Granted 56,342
 
$68.15
Vested 
 
Forfeited 
 
Unvested performance share awards, end of period 56,342
 
$68.15
For the Year Ended December 31, 2015    
Unvested performance share awards, beginning of period 56,342
 
$68.15
Granted 56,517
 
$65.51
Vested 
 
Forfeited 
 
Unvested performance share awards, end of period 112,859
 
$66.83
As of December 31, 2015, unrecognized compensation costs related to unvested performance share awards was $4.2 million and will be recognized over a weighted average period of 1.9 years. Compensation costs related to the performance share awards will be recognized if the requisite service period is fulfilled, even if the Company’s TSR relative to the TSR achieved by the defined peer group over the performance period results in the vesting of zero performance share awards.
The grant date fair value of the performance share awards is determined using the Monte Carlo simulation. The Monte Carlo simulation is based on random projections of stock price paths and must be repeated numerous times to achieve a probabilistic assessment. The following table summarizes the assumptions used to calculate the fair value of the performance share awards granted in 2015 and 2014:
  Years Ended December 31,
  2015 2014
Number of simulations 500,000 500,000
Stock price on the date of grant $53.58 $53.96
Volatility factor 45.3% 49.9%
Dividend yield % %
Risk-free interest rate 0.9% 0.9%
Expected term (in years) 2.89
 2.97

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Stock Options. The Company may grant stock options to employees, independent contractors and directors. Stock options can be settled, at the Company’s option, either in shares of common stock or as a cash payment equivalent to the fair market value of a share of common stock at on the exercise date. The price at which shares of common stock may be purchased due to the exercise of stock options must not be less than the fair market value of the common stock on the date of grant. The table below summarizes the activity for stock options for the years ended December 31, 2015, 2014 and 2013:
  Stock Options 
Weighted
Average
Exercise
Prices
 
Weighted Average Remaining Life
(In years)
 
Aggregate
Intrinsic Value
(In millions)
 Cash Received from Exercises (In millions) Tax Benefit Realized from Exercises (In millions)
For the Year Ended December 31, 2013            
Outstanding, beginning of period 242,854
 
$7.24
        
Granted 
 
        
Exercised (206,501) 
$6.07
   
$4.4
 
$1.3
 
$1.5
Forfeited 
 
        
Outstanding, end of period 36,353
 
$13.91
 1.1 
$1.1
    
Exercisable, end of period 36,353
 
$13.91
 1.1 
$1.1
    
For the Year Ended December 31, 2014            
Outstanding, beginning of period 36,353
 
$13.91
        
Granted 
 
        
Exercised (33,086) 
$13.20
   
$1.3
 
$0.4
 
$0.4
Forfeited 
 
        
Expired (834) 
$27.25
        
Outstanding, end of period 2,433
 
$19.02
 0.5 
$0.1
    
Exercisable, end of period 2,433
 
$19.02
 0.5 
$0.1
    
For the Year Ended December 31, 2015            
Outstanding, beginning of period 2,433
 
$19.02
        
Granted 
 
        
Exercised (2,433) 
$19.02
   
$0.1
 
$—
 
$0.1
Forfeited 
 
        
Outstanding, end of period 
 
 0 
    
Exercisable, end of period 
 
 0 
    
As of December 31, 2015, all stock options were vested and exercised and accordingly, the Company had no unrecognized compensation costs related to stock options.
Stock-Based Compensation Expense, Net
The Company recognizedfollowing table sets forth the followingcomponents of stock-based compensation expense, associated with restricted stock awards and units, SARs, and performance share awards for the periods indicated which is reflected as general and administrative expense in the consolidated statements of operations:net:
  Years Ended December 31,
  2015 2014 2013
   (In thousands)
Restricted stock awards and units 
$23,668
 
$29,597
 
$18,997
Stock appreciation rights (6,326) 1,985
 17,303
Performance share awards 1,961
 1,395
 
  19,303
 32,977
 36,300
Less: amounts capitalized (4,574) (7,099) (6,927)
Total stock-based compensation expense 
$14,729
 
$25,878
 
$29,373
Income tax benefit 
$5,155
 
$9,059
 
$10,281
  Years Ended December 31,
  2018 2017 2016
   (In thousands)
Restricted stock awards and units 
$18,434
 
$21,372
 
$28,196
Cash SARs (2,571) (5,023) 9,675
Performance shares 1,785
 2,442
 2,806
  17,648
 18,791
 40,677
Less: amounts capitalized to oil and gas properties (4,124) (4,482) (4,591)
Total stock-based compensation expense, net 
$13,524
 
$14,309
 
$36,086
11. Earnings Per Share
Basic income (loss) from continuing operations per common share is based on the weighted average number of shares of common stock outstanding during the year. Diluted income (loss) from continuing operations per common share is based on the weighted

F-25



average number of common shares and all potentially dilutive common shares outstanding during the year which include restricted stock awards and units, performance share awards, stock options and warrants. The Company excludes the number of awards, units, options and warrants from the calculation of diluted weighted average shares outstanding when the grant date or exercise prices are greater than the average market prices of the Company’s common stock for the year as the effect would be anti-dilutive to the computation. The Company includes the number of performance share awards in the calculation of diluted weighted average common shares outstanding based on the number of shares, if any, that would be issuable as if the end of the year was the end of the performance period. When a loss from continuing operations exists, all potentially dilutive common shares outstanding are anti-dilutive and therefore excluded from the calculation of diluted weighted average shares outstanding.
Supplemental income (loss) from continuing operations per common share information is provided below:
  Years Ended December 31,
  2015 2014 2013
  (In thousands, except per share amounts)
Income (Loss) From Continuing Operations 
($1,157,885) 
$222,283
 
$21,858
Basic weighted average common shares outstanding 51,457
 45,372
 40,781
Effect of dilutive instruments:      
Restricted stock awards and units 
 684
 492
Performance share awards 
 56
 
Stock options 
 13
 47
Warrants 
 69
 35
Diluted weighted average common shares outstanding 51,457
 46,194
 41,355
Income (Loss) From Continuing Operations Per Common Share      
Basic 
($22.50) 
$4.90
 
$0.54
Diluted 
($22.50) 
$4.81
 
$0.53
For the year ended December 31, 2015, the Company reported a loss from continuing operations. As a result, the calculation of diluted weighted average common shares outstanding excluded the anti-dilutive effect of 0.6 million shares of restricted stock awards and units and performance share awards and an insignificant number of shares of stock options and warrants. For the years ended December 31, 2014 and 2013, the number of shares of restricted stock awards and units, performance share awards, options and warrants excluded due to anti-dilutive effects were insignificant.
12. Related Party TransactionsDerivative Instruments
Avista Joint Ventures. Effective August 2008, the Company’s wholly owned subsidiary Carrizo (Marcellus) LLC entered into a joint venture arrangement with ACP II Marcellus LLC (“ACP II”), an affiliate of Avista Capital Partners, LP, a private equity fund. Effective September 2011, the Company’s wholly-owned subsidiary, Carrizo (Utica) LLC, entered into a joint venture in the Utica with ACP II and ACP III Utica LLC (“ACP III”), an affiliate of ACP II and Avista Capital Partners, LP. (collectively with ACP II and ACP III, “Avista”). During the term of the Avista joint ventures, the joint venture partners acquired and sold acreage and the Company exercised options under the applicable Avista joint venture agreements to acquire acreage from Avista.
The Avista Utica joint venture agreements were terminated on October 31, 2013 in connection with the Company’s purchase of certain ACP III assets. After giving effect to such transaction, the Company and Avista remain working interest partners in Utica with the Company acting as the operator of the jointly owned properties which are now subject to standard joint operating agreements. The joint operating agreements with Avista provide for limited areas of mutual interest around properties jointly owned by the Company and Avista.
Carrizo Relationship with Avista. Steven A. Webster, Chairman of the Company’s Board of Directors, serves as Co-Managing Partner and President of Avista Capital Holdings, LP, which entity has the ability to control Avista and its affiliates. As previously disclosed, the Company has been and is a party to prior arrangements with affiliates of Avista Capital Holdings, LP.
The terms of the joint ventures with Avista in the Utica and the Marcellus and a related prior acquisition transaction were each separately approved by a special committee of the Company’s independent directors. In determining whether to approve or disapprove a transaction, such special committee has determined whether the transaction is desirable and in the best interest of the Company and has evaluated such transaction is fair to the Company and its shareholders on the same basis as comparable arm’s length transactions. The committee has applied, and may in other transactions also apply, standards under relevant debt agreements if required.
Amounts due from Avista and Affiliates. As of December 31, 2015 and 2014, related party receivable on the consolidated balance sheets included $2.4 million and $1.9 million, respectively, representing the net amounts ACP II and ACP III owes the Company related to activity within the Avista Marcellus and Avista Utica joint ventures.

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13.Commodity Derivative Instruments
The Company uses commodity derivative instruments to reduce its exposure tomitigate the effects of commodity price volatility for a substantial, but varying, portion of its forecasted oil and gassales of production and thereby achieve a more predictable level of cash flows to supportflow. Since the Company derives a significant portion of its revenues from sales of crude oil, crude oil price volatility represents the Company’s drilling and completion capital expenditure program.most significant commodity price risk. While the use of commodity derivative instruments limits or partially reduces the downside risk of adverse commodity price movements, such use also limits the upside from favorable commodity price movements. The Company does not enter into commodity derivative instruments for speculative or trading purposes. As of December 31, 2015, the
The Company’s commodity derivative instruments, consistedwhich settle on a monthly basis over the term of fixedthe contract for contracted volumes, consist of over-the-counter price swaps, costlessthree-way collars, and purchased and sold call options and basis swaps, each of which areis described below.
Fixed Price Swaps: swapsThe Company receives are settled based on differences between a fixed price and paysthe settlement price of a variable marketreferenced index. If the settlement price toof the counterparties over specified periods for contracted volumes.
Costless Collars: A collar is a combination of options including a purchased put option (fixed floor price) and a sold call option (fixed ceiling price) and allows the Company to benefit from increases in commodity prices up to the fixed ceiling price and protect the Company from decreases in commodity prices below the fixed floor price. At settlement, if the market pricereferenced index is below the fixed floor price or is above the fixed ceiling price, the Company receives the difference from the counterparty. If the referenced settlement price is above the fixed price, andthe Company pays the marketdifference to the counterparty.
Three-way collars consist of a purchased put option (floor price), a sold call option (ceiling price) and a sold put option (sub-floor price) and are settled based on differences between the floor or ceiling prices and the settlement price of a referenced index or the difference between the floor price and sub-floor price. If the marketsettlement price of the referenced index is below the sub-floor price, the Company receives the difference between the floor price and sub-floor price from the counterparty. If the settlement price of the referenced index is between the fixed floor price and fixedsub-floor price, the Company receives the difference between the floor price and the settlement price of the referenced index from the counterparty. If the settlement price of the referenced index is between the floor price and ceiling price, no payments are due to or from either party. These contracts were executed contemporaneously withIf the same counterparties and were premium neutral such that no premiums were paidsettlement price of the referenced index is above the ceiling price, the Company pays the difference to or received from the counterparties.counterparty.
Sold Call Optionscall options: These contracts give are settled based on differences between the counterpartiesceiling price and the right, but notsettlement price of a referenced index. If the obligation,settlement price of the referenced index is above the ceiling price, the Company pays the difference to buy contracted volumes the counterparty. If the settlement price of the referenced index is below the ceiling price, no payments are due to or from either party. Premiums


from the Company over specified periods and prices in the future. At settlement, if the market price exceedssale of call options have been used to enhance the fixed price of certain contemporaneously executed price swaps. Purchased call options executed contemporaneously with sold call options in order to increase the ceiling price of existing sold call option,options have been presented on a net basis in the table below.
Basis swaps are settled based on differences between a fixed price differential and the differential between the settlement prices of two referenced indexes. If the differential between the settlement prices of the two referenced indexes is greater than the fixed price differential, the Company receives the difference from the counterparty. If the differential between the settlement prices of the two referenced indexes is less than the fixed price differential, the Company pays the counterpartydifference to the excess. Ifcounterparty.
The referenced index of the marketCompany’s price settles belowswaps, three-way collars and sold call options is U.S. New York Mercantile Exchange (“NYMEX”) West Texas Intermediate (“WTI”) for crude oil and NYMEX Henry Hub for natural gas, as applicable. The prices received by the fixedCompany for the sale of its production generally vary from these referenced index prices due to adjustments for delivery location (basis) and other factors. The referenced indexes of the Company’s basis swaps, which are used to mitigate location price risk for a portion of its production, are Argus WTI Cushing (“WTI Cushing”) and the applicable index price of the call option, no paymentCompany’s crude oil sales contracts is due from either party.Argus WTI Midland (“WTI Midland”) for its Delaware Basin crude oil production and Argus Light Louisiana Sweet (“LLS”) for its Eagle Ford crude oil production.
Purchased Call Options: TheseThe Company has incurred premiums on certain of its commodity derivative instruments in order to obtain a higher floor price and/or higher ceiling price. Payment of these premiums are deferred until the applicable contracts givesettle on a monthly basis over the Company the right, but not the obligation, to buy contracted volumes from the counterparties over specified periods and prices in the future. At settlement, if the market price exceeds the fixed priceterm of the call option,contract or, in some cases, during the counterparties pay the Company the excess. If the market price settles below the fixed pricefinal 12 months of the call option, no payment is due from either party.contract and are referred to as deferred premium obligations.
The following sets forth a summary of the Company’s open crude oil derivative positions at average NYMEX prices as of December 31, 2015.
Period Type of Contract 
Volumes
(in Bbls/d)
 
Weighted
Average
Floor Price
($/Bbl)
 
Weighted
Average
Ceiling Price
($/Bbl)
FY 2016 Fixed Price Swaps 9,315
 
$60.03
  
FY 2016 Costless Collars 5,490
 
$50.96
 
$74.73
FY 2018 Sold Call Options 2,488
   
$60.00
FY 2018 Sold Call Options 900
   
$75.00
FY 2019 Sold Call Options 2,975
   
$62.50
FY 2019 Sold Call Options 900
   
$77.50
FY 2020 Sold Call Options 3,675
   
$65.00
FY 2020 Sold Call Options 900
   
$80.00
On February 11, 2015, the Company entered into derivative transactions offsetting its then existing crude oil derivative positions covering the periods from March 2015 through December 2016. As a result of the offsetting derivative transactions, the Company locked in $166.4 million of cash flows, of which $118.9 million was received due to contract settlements during the year ended December 31, 2015, and is included in the gain on derivatives, net in the consolidated statements of operations. As of December 31, 2015, the fair value of the remaining locked in cash flows is $47.5 million, of which $44.8 million is a current asset and is classified as "Derivative assets" in the consolidated balance sheets. The derivative assets associated with the offsetting derivative transactions are not subject to price risk and the locked in cash flows will be received as the applicable contracts settle. Included in the $99.3 million gain on derivatives, net for the year ended December 31, 2015, is an $8.4 million gain representing the increase in fair value of the then-existing crude oil derivative positions from December 31, 2014 to February 11, 2015. The offsetting derivative transactions are not included in the table above.
Additionally, subsequent to entering into the offsetting derivative transactions described above,2018, the Company entered into costless collars forhad the periods from March 2015 through December 2016 that will continue to provide the Company with downside protectionfollowing outstanding commodity derivative instruments at crude oil prices below the weighted average floor prices yet allow the Company to benefit from an increase in crude oil prices up to the weighted average ceiling prices. During the thirdcontract volumes and fourth quarter of 2015, the Company sold out-of-the-money call options for the years 2017 through 2020 at ceiling prices of $60.00 per Bbl, $60.00 per Bbl, $62.50 per Bbl, and $65.00 per Bbl, respectively, and used the premium value associated with the sale of those out-of-the-money call options to obtain a higherprices:

F-27

Commodity Period Type of Contract Index Volumes
(Bbls
per day)
 Sub-Floor
Price
($ per
Bbl)
 
Floor
Price
($ per
Bbl)
 
Ceiling
Price
($ per
Bbl)
 Fixed
Price
Differential
($ per
Bbl)
Crude oil 1Q19 Three-Way Collars NYMEX WTI 27,000
 
$41.67
 
$50.96
 
$74.23
 
Crude oil 1Q19 Basis Swaps LLS-WTI Cushing 6,000
 
 
 
 
$5.16
Crude oil 1Q19 Basis Swaps WTI Midland-WTI Cushing 5,500
 
 
 
 
($5.24)
Crude oil 1Q19 Sold Call Options NYMEX WTI 3,875
 
 
 
$81.07
 
                 
Crude oil 2Q19 Three-Way Collars NYMEX WTI 27,000
 
$41.67
 
$50.96
 
$74.23
 
Crude oil 2Q19 Basis Swaps LLS-WTI Cushing 6,000
 
 
 
 
$5.16
Crude oil 2Q19 Basis Swaps WTI Midland-WTI Cushing 6,000
 
 
 
 
($5.38)
Crude oil 2Q19 Sold Call Options NYMEX WTI 3,875
 
 
 
$81.07
 
                 
Crude oil 3Q19 Three-Way Collars NYMEX WTI 27,000
 
$41.67
 
$50.96
 
$74.23
 
Crude oil 3Q19 Basis Swaps LLS-WTI Cushing 6,000
 
 
 
 
$5.16
Crude oil 3Q19 Basis Swaps WTI Midland-WTI Cushing 7,000
 
 
 
 
($5.56)
Crude oil 3Q19 Sold Call Options NYMEX WTI 3,875
 
 
 
$81.07
 
                 
Crude oil 4Q19 Three-Way Collars NYMEX WTI 27,000
 
$41.67
 
$50.96
 
$74.23
 
Crude oil 4Q19 Basis Swaps LLS-WTI Cushing 6,000
 
 
 
 
$5.16
Crude oil 4Q19 Basis Swaps WTI Midland-WTI Cushing 11,000
 
 
 
 
($3.84)
Crude oil 4Q19 Sold Call Options NYMEX WTI 3,875
 
 
 
$81.07
 
                 
Crude oil 2020 Basis Swaps WTI Midland-WTI Cushing 13,000
 
 
 
 
($1.27)
Crude oil 2020 Sold Call Options NYMEX WTI 4,575
 
 
 
$75.98
 
                 
Crude oil 2021 Basis Swaps WTI Midland-WTI Cushing 6,000
 
 
 
 
$0.03


weighted average fixed price of $60.03 per Bbl on newly executed fixed price swaps for the year 2016. These out-of-the-money call options and in-the-money fixed price swaps were executed contemporaneously with the same counterparties, therefore, no cash premiums were paid to or received from the counterparties as the premium value associated with the call options was immediately applied to the fixed price swaps for the year 2016.
During the fourth quarter of 2015, crude oil prices continued on a downward trend which decreased the value of call option contracts. In December 2015, the Company used this opportunity to purchase all of its previously existing 2017 sold call options. The Company also raised the ceiling on portions of its sold call options in 2018, 2019, and 2020 by buying back 900 Bbls/d of its then existing sold call options described above and simultaneously selling 900 Bbls/d of out-of-the-money call options for the years 2018 through 2020 at ceiling prices of $75.00 per Bbl, $77.50 per Bbl, and $80.00 per Bbl, respectively. The crude oil derivative positions table above shows the net effect of the purchased and sold out-of-the-money call options for each of the years 2017 through 2020. As a result of the purchased and sold out-of-the-money call options executed in December 2015, the Company incurred net premiums of approximately $5.0 million, the payment of which is deferred until settlement. See “Note 17. Subsequent Events” for details of transactions entered into subsequent to December 31, 2015.
For the years ended December 31, 2015, 2014 and 2013, the Company recorded in the consolidated statements of operations a gain on derivatives, net of $99.3 million, $201.9 million, and a loss on derivatives, net of $18.4 million, respectively.
Commodity Period Type of Contract Index 
Volumes
(MMBtu
per day)
 
Sub-Floor
Price
($ per
MMBtu)
 
Floor
Price
($ per
MMBtu)
 
Ceiling
Price
($ per
MMBtu)
 
Fixed
Price
 Differential
($ per
MMBtu)
Natural gas 1Q19 Sold Call options NYMEX Henry Hub 33,000
 
 
 
$3.25
 
                 
Natural gas 2Q19 Sold Call options NYMEX Henry Hub 33,000
 
 
 
$3.25
 
                 
Natural gas 3Q19 Sold Call options NYMEX Henry Hub 33,000
 
 
 
$3.25
 
                 
Natural gas 4Q19 Sold Call options NYMEX Henry Hub 33,000
 
 
 
$3.25
 
                 
Natural gas 2020 Sold Call options NYMEX Henry Hub 33,000
 
 
 
$3.50
 
The Company typically has numerous hedge positionscommodity derivative instruments outstanding with a counterparty that span severalwere executed at various dates, for various contract types, commodities and time periods and often resultresulting in both fair valuecommodity derivative asset and liability positions held with that counterparty, which positions are all offset to a single fair value asset or liability at the end of each reporting period. The Company includes any deferred premiums associated with its hedge positions in the fair value amounts.counterparty. The Company nets its commodity derivative instrument fair value amountsvalues executed with the same counterparty, along with any deferred premium obligations, to a single asset or liability pursuant to ISDA master agreements,ISDAs, which provide for net settlement over the term of the contract and in the event of default or termination of the contract. The fair value of
Counterparties to the Company’s commodity derivative instruments who are a Lender Counterparty allow the Company to satisfy any need for margin obligations associated with commodity derivative instruments where the Company is in a net assetliability position with its counterparties as of December 31, 2015 and 2014 totaled $119.6 million and $214.8 million, respectively, and is summarized by counterparty in the table below:
Counterparty December 31, 2015 December 31, 2014
Societe Generale 37% 26%
Wells Fargo 35% 37%
Citibank 13% %
Regions 9% 8%
Union Bank 5% 4%
Capital One 1% %
Credit Suisse % 24%
Royal Bank of Canada % 1%
Total 100% 100%
The counterparties to the Company’s derivative instruments are also lenders under the Company’s credit agreement, which allows the Company to satisfy any need for margin obligations resulting from adverse changes in the fair value of its derivative instrumentsLender Counterparty with the collateral securing the credit agreement, thus eliminating the need for independent collateral posting. Counterparties to the Company’s commodity derivative instruments who are a Non-Lender Counterparty can require commodity derivative instruments to be novated to a Lender Counterparty if the Company’s net liability position exceeds the Company’s unsecured credit limit with the Non-Lender Counterparty and therefore do not require the posting of cash collateral.
Because each of the counterparties haveLender Counterparty has an investment grade credit ratings,rating and the Company has obtained a guaranty from each Non-Lender Counterparty’s parent company which has an investment grade credit rating, the Company believes it does not have significant credit risk and accordingly does not currently require its counterparties to post collateral to support the net asset positions of its derivative instruments. As such, the Company is exposed to credit risk to the extent of nonperformance by the counterparties to itscommodity derivative instruments. Although the Company does not currently anticipate such nonperformance from its counterparties, it continues to monitorcontinually monitors the credit ratings of each Lender Counterparty and each Non-Lender Counterparty’s parent company. The Company executes its counterparties.derivative instruments with seventeen counterparties to minimize its credit exposure to any individual counterparty.


Contingent Consideration Arrangements
The purchase and sale agreements of the ExL Acquisition and divestitures of the Company’s assets in the Niobrara, Marcellus and Utica, included contingent consideration arrangements that require the Company to pay or entitle the Company to receive specified amounts if commodity prices exceed specified thresholds, which are summarized in the table below. See “Note 3. Acquisitions and Divestitures of Oil and Gas Properties” for further discussion.
Contingent Consideration Arrangements Years 
Threshold (1)
 Contingent Receipt (Payment) - Annual Contingent Receipt (Payment) - Aggregate Limit
      (In thousands)
Contingent ExL Consideration 2018 
$50.00
 
($50,000)  
  2019 50.00
 (50,000)  
  2020 50.00
 (50,000)  
  2021 50.00
 (50,000) 
($125,000)
         
Contingent Niobrara Consideration 2018 
$55.00
 
$5,000
  
  2019 55.00
 5,000
  
  2020 60.00
 5,000
 
         
Contingent Marcellus Consideration 2018 
$3.13
 
$3,000
  
  2019 3.18
 3,000
  
  2020 3.30
 3,000
 
$7,500
         
Contingent Utica Consideration 2018 
$50.00
 
$5,000
  
  2019 53.00
 5,000
  
  2020 56.00
 5,000
 
(1)The price used to determine whether the specified threshold for each year has been met for the Contingent ExL Consideration, Contingent Niobrara Consideration and Contingent Utica Consideration is the average daily closing spot price per barrel of WTI crude oil as measured by the U.S. Energy Information Administration. The price used to determine whether the specified threshold for each year has been met for the Contingent Marcellus Consideration is the average monthly settlement price per MMBtu of Henry Hub natural gas for the next calendar month, as determined on the last business day preceding each calendar month as measured by the CME Group Inc.


Derivative Assets and Liabilities
The derivative instrument asset and liability fair values recorded in the consolidated balance sheets as of December 31, 2018 and December 31, 2017 are summarized below:
  December 31, 2018
  Gross Amounts Recognized Gross Amounts Offset in the Consolidated Balance Sheets Net Amounts Presented in the Consolidated Balance Sheets
  (In thousands)
Commodity derivative instruments 
$50,406
 
($20,502) 
$29,904
Contingent Niobrara Consideration 5,000
 
 5,000
Contingent Utica Consideration 5,000
 
 5,000
Derivative assets 
$60,406
 
($20,502) 
$39,904
Commodity derivative instruments 6,083
 (4,236) 1,847
Contingent Niobrara Consideration 2,035
 
 2,035
Contingent Marcellus Consideration 1,369
 
 1,369
Contingent Utica Consideration 2,501
 
 2,501
Other long-term assets 
$11,988
 
($4,236) 
$7,752
       
Commodity derivative instruments 
($15,345) 
$10,140
 
($5,205)
Deferred premium obligations (10,362) 10,362
 
Contingent ExL Consideration (50,000) 
 (50,000)
Derivative liabilities-current 
($75,707) 
$20,502
 
($55,205)
Commodity derivative instruments (10,751) 518
 (10,233)
Deferred premium obligations (3,718) 3,718
 
Contingent ExL Consideration (30,584) 
 (30,584)
Derivative liabilities-non current 
($45,053) 
$4,236
 
($40,817)
  December 31, 2017
  Gross Amounts Recognized Gross Amounts Offset in the Consolidated Balance Sheets Net Amounts Presented in the Consolidated Balance Sheets
  (In thousands)
Commodity derivative instruments 
$4,869
 
($4,869) 
$—
Derivative assets 
$4,869
 
($4,869) 
$—
Commodity derivative instruments 9,505
 (9,505) 
Contingent Marcellus Consideration 2,205
 
 2,205
Contingent Utica Consideration 7,985
 
 7,985
Other long-term assets 
$19,695
 
($9,505) 
$10,190
       
Commodity derivative instruments 
($52,671) 
($4,450) 
($57,121)
Deferred premium obligations (9,319) 9,319
 
Derivative liabilities-current 
($61,990) 
$4,869
 
($57,121)
Commodity derivative instruments (24,609) (2,098) (26,707)
Deferred premium obligations (11,603) 11,603
 
Contingent ExL Consideration (85,625) 
 (85,625)
Derivative liabilities-non current 
($121,837) 
$9,505
 
($112,332)
See “Note 13. Fair Value Measurements” for additional information regarding the fair value of the Company’s derivative instruments.


(Gain) Loss on Derivatives, Net
The components of “(Gain) loss on derivatives, net” in the consolidated statements of operations for the years ended December 31, 2018, 2017, and 2016 are summarized below:
  Years Ended December 31,
  2018 2017 2016
  (In thousands)
(Gain) Loss on Derivatives, Net      
Crude oil 
($9,726) 
$22,839
 
$23,609
NGL 4,439
 1,322
 
Natural gas (421) (15,399) 19,584
Deferred premium obligations 1,875
 18,401
 5,880
Contingent ExL Consideration (5,041) 33,325
 
Contingent Niobrara Consideration 845
 
 
Contingent Marcellus Consideration 836
 455
 
Contingent Utica Consideration 484
 (1,840) 
(Gain) Loss on Derivatives, Net 
($6,709) 
$59,103
 
$49,073
Cash Received (Paid) for Derivative Settlements, Net
For the years ended December 31, 2018, 2017, and 2016, there were no settlements of contingent consideration arrangements, however, the specified pricing thresholds related to the Contingent ExL Consideration, the Contingent Niobrara Consideration, and the Contingent Utica Consideration were exceeded for the year ended December 31, 2018. See “Note 16. Subsequent Events” for further discussion.
The components of “Cash received (paid) for derivative settlements, net” in the consolidated statements of cash flows for the years ended December 31, 2018, 2017, and 2016 are summarized below:
  Years Ended December 31,
  2018 2017 2016
Cash Flows from Operating Activities (In thousands)
Cash Received (Paid) for Derivative Settlements, Net      
Crude oil 
($78,570) 
$9,883
 
$125,098
NGL (6,378) 
 
Natural gas (1,710) (54) 
Deferred premium obligations (9,649) (2,056) (5,729)
Cash Received (Paid) for Derivative Settlements, Net 
($96,307) 
$7,773
 
$119,369
14.13. Fair Value Measurements
Accounting guidelines for measuring fair value establish a three-level valuation hierarchy for disclosure of fair value measurements. The valuation hierarchy categorizes assets and liabilities measured at fair value into one of three different levels depending on the observability of the inputs employed in the measurement. The three levels are defined as follows:
Level 1 – Observable inputs such as quoted prices in active markets at the measurement date for identical, unrestricted assets or liabilities.
Level 2 – Other inputs that are observable directly or indirectly such as quoted prices in markets that are not active, or inputs which are observable, either directly or indirectly, for substantially the full term of the asset or liability.
Level 3 – Unobservable inputs for which there is little or no market data and which the Company makes its own assumptions about how market participants would price the assets and liabilities.

F-28




Assets and Liabilities Measured at Fair Value on a Recurring Basis
The following tables summarize the location and amounts of the Company’s derivative instrument assets and liabilities measured at fair value on a recurring basis as presentedof December 31, 2018 and 2017:
December 31, 2018
Level 1Level 2Level 3
(In thousands)
Assets
Commodity derivative instruments
$—

$31,751

$—
Contingent Niobrara Consideration
7,035

Contingent Marcellus Consideration
1,369

Contingent Utica Consideration
7,501

Liabilities
Commodity derivative instruments
$—

($15,438)
$—
Contingent ExL Consideration
(80,584)
December 31, 2017
Level 1Level 2Level 3
(In thousands)
Assets
Commodity derivative instruments
$—

$—

$—
Contingent Niobrara Consideration


Contingent Marcellus Consideration

2,205
Contingent Utica Consideration

7,985
Liabilities
Commodity derivative instruments
$—

($83,828)
$—
Contingent ExL Consideration

(85,625)
The asset and liability fair values reported in the consolidated balance sheets are as of the balance sheet date and subsequently change as a result of changes in commodity prices, market conditions and other factors.
December 31, 2015Commodity derivative instruments. and 2014. All items included in the tables below are Level 2 inputs within the fair value hierarchy:
  December 31, 2015
  Gross Amounts Recognized Gross Amounts Offset in the Consolidated Balance Sheets Net Amounts Presented in the Consolidated Balance Sheets
  (In thousands)
Derivative assets      
Derivative assets-current 
$159,447
 
($28,347) 
$131,100
Derivative assets-non current 10,780
 (9,665) 1,115
Derivative liabilities      
Other current liabilities (28,364) 28,347
 (17)
Derivative liabilities-non current (22,313) 9,665
 (12,648)
Total 
$119,550
 
$—
 
$119,550
  December 31, 2014
  Gross Amounts Recognized Gross Amounts Offset in the Consolidated Balance Sheets Net Amounts Presented in the Consolidated Balance Sheets
  (In thousands)
Derivative assets      
Derivative assets-current 
$183,625
 
($12,524) 
$171,101
Derivative assets-non current 44,725
 (1,041) 43,684
Derivative liabilities      
Other current liabilities (12,707) 12,524
 (183)
Derivative liabilities-non current (1,058) 1,041
 (17)
Total 
$214,585
 
$—
 
$214,585
The fair valuesvalue of the Company’s commodity derivative assets and liabilities areinstruments is based on a third-party industry-standard pricing model which uses contract terms and prices and assumptions and inputs that uses market data obtained from third-party sources,are substantially observable in active markets throughout the full term of the instruments including quoted forward prices for crude oil and natural gas price curves, discount rates and volatility factors.factors, and are therefore designated as Level 2 within the valuation hierarchy. The fair values are also compared to the values provided by the counterparties for reasonableness and are adjusted for the counterparties’ credit quality for commodity derivative assets and the Company’s credit quality for commodity derivative liabilities. To date,
Contingent consideration arrangements. The fair values of the contingent consideration arrangements were determined by a third-party valuation specialist using Monte Carlo simulations including significant inputs such as forward oil and gas price curves, volatility factors, and risk adjusted discount rates, which include adjustments for the counterparties’ credit quality have not had a material impact on the fair values.
The derivative assetfor contingent consideration assets and liability fair values reported in the consolidated balance sheets that pertain to the Company’s derivative instruments,credit quality for the contingent consideration liabilities. These inputs are substantially observable in active markets throughout the full term of the contingent consideration arrangements or can be derived from observable data and are therefore designated as well asLevel 2 within the Company’s crude oil derivative instruments that were entered into subsequent tovaluation hierarchy. The Company reviewed the offsetting derivative transactions, are as of a particular point in timevaluations, including the related inputs, and subsequently change as these estimates are revised to reflect actual results,analyzed changes in market conditions and other factors. However, the fair value ofmeasurements between periods.


The following tables present the net derivative asset attributable to the offsetting crude oil derivative transactions are not subject to price risk asreconciliation of changes in the fair valuevalues of the original positions are offset by changes incontingent consideration arrangements, which were designated within the fair value of the offsetting positions. The Company includes any deferred premiums associated with its hedge positions in the fair value amounts. The Company typically has numerous hedge positions that span several time periods and often result in both derivative assets and liabilities with the same counterparty, which positions are all offset to a single derivative asset or liability in the consolidated balance sheets. The Company nets the fair values of its derivative assets and liabilities associated with derivative instruments executed with the same counterparty pursuant to ISDA master agreements, which provide for net settlement over the term of the contract and in the event of default or termination of the contract. The Company had no transfers into Level 1 and no transfers into or out ofvaluation hierarchy as Level 2 for the yearsyear ended December 31, 20152018 and 2014.Level 3 for the year ended December 31, 2017:

F-29

  Contingent Consideration Arrangements
  Assets Liability
  (In thousands)
Balance as of January 1, 2017 
$—
 
$—
Recognition of (acquisition) divestiture date fair value 8,805
 (52,300)
Gain (loss) on change in fair value, net(1)
 1,385
 (33,325)
Transfers into (out of) Level 3 
 
Balance as of December 31, 2017 
$10,190
 
($85,625)
Recognition of divestiture date fair value 7,880
 
Gain (loss) on changes in fair value, net(1)
 (2,165) 5,041
Transfers out of Level 3 (15,905) 80,584
Balance as of December 31, 2018 
$—
 
$—
(1)Recognized as “(Gain) loss on derivatives, net” in the consolidated statements of operations.
During 2018, the Company determined that the contingent consideration arrangements met the requirements to be designated as Level 2 in the valuation hierarchy due to the increased observability of the forward oil and gas price curves used in determining the fair value throughout the full term of the contingent consideration arrangements resulting in the transfer out of Level 3.
See “Note 12. Derivative Instruments” for additional information regarding the contingent consideration arrangements.
Assets and Liabilities Measured at Fair Value on a Non-Recurring Basis
The fair value measurements of assets acquired and liabilities assumed, other than contingent consideration which is discussed above, are measured as of the acquisition date by a third-party valuation specialist using a discounted cash flow model based on inputs that are not observable in the market and are therefore designated as Level 3 inputs. Significant inputs to the valuation of acquired oil and gas properties include forward oil and gas price curves, estimated volumes of oil and gas reserves, expectations for timing and amount of future development and operating costs, future plugging and abandonment costs, and a risk adjusted discount rate. See “Note 3. Acquisitions and Divestitures of Oil and Gas Properties” for additional discussion.
The fair value measurements of asset retirement obligations are measured as of the date a well is drilled or when production equipment and facilities are installed using a discounted cash flow model based on inputs that are not observable in the market and therefore are designated as Level 3 within the valuation hierarchy. Significant inputs to the fair value measurement of asset retirement obligations include estimates of the costs of plugging and abandoning oil and gas wells, removing production equipment and facilities and restoring the surface of the land as well as estimates of the economic lives of the oil and gas wells and future inflation rates. See “Note 7. Asset Retirement Obligations” for additional discussion.
The fair value measurements of the Preferred Stock are measured as of the issuance date by a third-party valuation specialist using a discounted cash flow model based on inputs that are not observable in the market and therefore are designated as Level 3 inputs. Significant inputs to the valuation of the Preferred Stock include the per share cash purchase price, redemption premiums, liquidation preference, and redemption assumptions provided by the Company. See “Note 9. Preferred Stock and Common Stock Warrants” for details regarding the allocation of the net proceeds based on the relative fair values of the Preferred Stock and Warrants.



Fair Value of Other Financial Instruments
The Company’s other financial instruments consist of cash and cash equivalents, receivables, payables, and long-term debt, which are classified as Level 1 under the fair value hierarchy with the exception of the deferred purchase payment, which is classified as Level 2 under the fair value hierarchy.debt. The carrying amounts of cash and cash equivalents, receivables, and payables approximate fair value due to the highly liquid or short-term nature of these instruments. The carrying amount of long-term debt associated with borrowings outstanding under the Company’s revolving credit facility approximates fair value as borrowings bear interest at variable rates. The following table presents the carryingprincipal amounts of long-term debt with the fair values of the Company’s senior notes and other long-term debt based on quoted market prices andwith the fair value ofvalues measured using quoted secondary market trading prices which are designated as Level 1 within the deferred purchase payment based on indirect observable market rates.valuation hierarchy. See “Note 6. Long-Term Debt” for additional discussion.
 December 31, 2015 December 31, 2014 December 31, 2018 December 31, 2017
 Carrying Amount Fair Value Carrying Amount Fair Value Principal Amount Fair Value Principal Amount Fair Value
 (In thousands) (In thousands)
Deferred purchase payment due 2015 
$—
 
$—
 
$148,900
 
$148,558
8.625% Senior Notes due 2018 
 
 596,555
 597,000
7.50% Senior Notes due 2020 601,251
 528,000
 601,466
 573,000
 
$—
 
$—
 
$450,000
 
$459,518
6.25% Senior Notes due 2023 650,000
 533,000
 
 
 650,000
 599,625
 650,000
 674,375
8.25% Senior Notes due 2025 250,000
 244,375
 250,000
 274,375
Other long-term debt due 2028 4,425
 4,182
 4,425
 4,071
 
 
 4,425
 4,445
15.14. Condensed Consolidating Financial Information
The rules of the SEC require that condensed consolidating financial information be provided for a subsidiary that has guaranteed the debt of a registrant issued in a public offering, where the guarantee is full, unconditional and joint and several and where the voting interest of the subsidiary is 100% owned by the registrant. The Company is, therefore, presenting condensed consolidating financial information on a parent company, combined guarantor subsidiaries, combined non-guarantor subsidiaries and consolidated basis and should be read in conjunction with the consolidated financial statements. The financial information may not necessarily be indicative of results of operations, cash flows, or financial position had such guarantor subsidiaries operated as independent entities.
Investments in subsidiaries are accounted for by the respective parent company using the equity method for purposes of this presentation. Results of operations of subsidiaries are therefore reflected in the parent company’s investment accounts and earnings. The principal elimination entries set forth below eliminate investments in subsidiaries and intercompany balances and transactions. Typically in a condensed consolidating financial statement, the net income and equity of the parent company equals the net income and equity of the consolidated entity. The Company’s oil and gas properties are accounted for using the full cost method of accounting whereby impairments and DD&A are calculated and recorded on a country by country basis. However, when calculated separately on a legal entity basis, the combined totals of parent company and subsidiary impairments and DD&A can be more or less than the consolidated total as a result of differences in the properties each entity owns including amounts of costs incurred, production rates, reserve mix, future development costs, etc. Accordingly, elimination entries are required to eliminate any differences between consolidated and parent company and subsidiary company combined impairments and DD&A.

F-30




CARRIZO OIL & GAS, INC.
CONDENSED CONSOLIDATING BALANCE SHEETS
(In thousands)
 December 31, 2015 December 31, 2018
 
Parent
Company
 
Combined
Guarantor
Subsidiaries
 
Combined
Non-
Guarantor
Subsidiaries
 Eliminations Consolidated 
Parent
Company
 
Combined
Guarantor
Subsidiaries
 
Combined
Non-
Guarantor
Subsidiaries
 Eliminations Consolidated
Assets                    
Total current assets 
$2,578,034
 
$52,067
 
$—
 
($2,397,919) 
$232,182
 
$3,341,680
 
$114,005
 
$—
 
($3,305,316) 
$150,369
Total property and equipment, net 44,499
 1,671,774
 3,059
 (2,471) 1,716,861
 7,951
 3,011,387
 3,028
 (3,842) 3,018,524
Investment in subsidiaries (815,836) 
 
 815,836
 
 (419,159) 
 
 419,159
 
Other assets 94,338
 156
 
 (16,632) 77,862
Other long-term assets 28,124
 5,906
 
 (17,823) 16,207
Total Assets 
$1,901,035
 
$1,723,997
 
$3,059
 
($1,601,186) 
$2,026,905
 
$2,958,596
 
$3,131,298
 
$3,028
 
($2,907,822) 
$3,185,100
                    
Liabilities and Shareholders’ Equity                    
Current liabilities 
$161,792
 
$2,521,572
 
$3,059
 
($2,400,939) 
$285,484
 
$135,980
 
$3,491,337
 
$3,028
 
($3,308,336) 
$322,009
Long-term liabilities 1,279,859
 18,261
 
 (753) 1,297,367
 1,650,589
 59,120
 
 (1,944) 1,707,765
Preferred stock 174,422
 
 
 
 174,422
Total shareholders’ equity 459,384
 (815,836) 
 800,506
 444,054
 997,605
 (419,159) 
 402,458
 980,904
Total Liabilities and Shareholders’ Equity 
$1,901,035
 
$1,723,997
 
$3,059
 
($1,601,186) 
$2,026,905
 
$2,958,596
 
$3,131,298
 
$3,028
 
($2,907,822) 
$3,185,100
 December 31, 2014 December 31, 2017
 
Parent
Company
 
Combined
Guarantor
Subsidiaries
 
Combined
Non-
Guarantor
Subsidiaries
 Eliminations Consolidated 
Parent
Company
 
Combined
Guarantor
Subsidiaries
 
Combined
Non-
Guarantor
Subsidiaries
 Eliminations Consolidated
Assets                    
Total current assets 
$2,380,445
 
$245,051
 
$111
 
($2,346,986) 
$278,621
 
$3,441,633
 
$105,533
 
$—
 
($3,424,288) 
$122,878
Total property and equipment, net 613
 2,562,029
 39,939
 26,672
 2,629,253
 5,953
 2,630,707
 3,028
 (3,878) 2,635,810
Investment in subsidiaries 233,173
 
 
 (233,173) 
 (999,793) 
 
 999,793
 
Other assets 140,774
 
 
 (67,172) 73,602
Other long-term assets 9,270
 10,346
 
 
 19,616
Total Assets 
$2,755,005
 
$2,807,080
 
$40,050
 
($2,620,659) 
$2,981,476
 
$2,457,063
 
$2,746,586
 
$3,028
 
($2,428,373) 
$2,778,304
                    
Liabilities and Shareholders’ Equity                    
Current liabilities 
$296,686
 
$2,434,649
 
$39,955
 
($2,346,986) 
$424,304
 
$165,701
 
$3,631,401
 
$3,028
 
($3,427,308) 
$372,822
Long-term liabilities 1,364,793
 139,353
 
 (50,415) 1,453,731
 1,689,466
 114,978
 
 15,879
 1,820,323
Preferred stock 214,262
 
 
 
 214,262
Total shareholders’ equity 1,093,526
 233,078
 95
 (223,258) 1,103,441
 387,634
 (999,793) 
 983,056
 370,897
Total Liabilities and Shareholders’ Equity 
$2,755,005
 
$2,807,080
 
$40,050
 
($2,620,659) 
$2,981,476
 
$2,457,063
 
$2,746,586
 
$3,028
 
($2,428,373) 
$2,778,304

F-31




CARRIZO OIL & GAS, INC.
CONDENSED CONSOLIDATING STATEMENTS OF OPERATIONS
(In thousands)
  Year Ended December 31, 2015
  
Parent
Company
 
Combined
Guarantor
Subsidiaries
 
Combined
Non-
Guarantor
Subsidiaries
 Eliminations Consolidated
Total revenues 
$1,708
 
$427,495
 
$—
 
$—
 
$429,203
Total costs and expenses 95,464
 1,603,515
 
 28,984
 1,727,963
Loss from continuing operations before income taxes (93,756) (1,176,020) 
 (28,984) (1,298,760)
Income tax benefit 10,125
 127,010
 
 3,740
 140,875
Equity in loss of subsidiaries (1,049,010) 
 
 1,049,010
 
Loss from continuing operations 
($1,132,641) 
($1,049,010) 
$—
 
$1,023,766
 
($1,157,885)
Income from discontinued operations, net of income taxes 2,731
 
 
 
 2,731
Net loss 
($1,129,910) 
($1,049,010) 
$—
 
$1,023,766
 
($1,155,154)
  Year Ended December 31, 2018
  
Parent
Company
 
Combined
Guarantor
Subsidiaries
 
Combined
Non-
Guarantor
Subsidiaries
 Eliminations Consolidated
Total revenues 
$162
 
$1,065,780
 
$—
 
$—
 
$1,065,942
Total costs and expenses 176,406
 479,973
 
 (37) 656,342
Income (loss) before income taxes (176,244) 585,807
 
 37
 409,600
Income tax expense 
 (5,173) 
 
 (5,173)
Equity in income of subsidiaries 580,634
 
 
 (580,634) 
Net income 
$404,390
 
$580,634
 
$—
 
($580,597) 
$404,427
Dividends on preferred stock (18,161) 
 
 
 (18,161)
Accretion on preferred stock (3,057) 
 
 
 (3,057)
Loss on redemption of preferred stock (7,133) 
 
 
 (7,133)
Net income attributable to common shareholders 
$376,039
 
$580,634
 
$—
 
($580,597) 
$376,076
 Year Ended December 31, 2014 Year Ended December 31, 2017
 
Parent
Company
 
Combined
Guarantor
Subsidiaries
 
Combined
Non-
Guarantor
Subsidiaries
 Eliminations Consolidated 
Parent
Company
 
Combined
Guarantor
Subsidiaries
 
Combined
Non-
Guarantor
Subsidiaries
 Eliminations Consolidated
Total revenues 
$3,938
 
$706,121
 
$128
 
$—
 
$710,187
 
$302
 
$745,586
 
$—
 
$—
 
$745,888
Total costs and expenses (76,531) 442,343
 30
 (5,865) 359,977
 195,728
 459,057
 
 (37) 654,748
Income from continuing operations before income taxes 80,469
 263,778
 98
 5,865
 350,210
Income (loss) before income taxes (195,426) 286,529
 
 37
 91,140
Income tax expense (28,164) (92,322) 
 (7,441) (127,927) 
 (4,030) 
 
 (4,030)
Equity in income of subsidiaries 171,554
 
 
 (171,554) 
 282,499
 
 
 (282,499) 
Income from continuing operations 
$223,859
 
$171,456
 
$98
 
($173,130) 
$222,283
Income from discontinued operations, net of income taxes 4,060
 
 
 
 4,060
Net income 
$227,919
 
$171,456
 
$98
 
($173,130) 
$226,343
 
$87,073
 
$282,499
 
$—
 
($282,462) 
$87,110
Dividends on preferred stock (7,781) 
 
 
 (7,781)
Accretion on preferred stock (862) 
 
 
 (862)
Loss on redemption of preferred stock 
 
 
 
 
Net income attributable to common shareholders 
$78,430
 
$282,499
 
$—
 
($282,462) 
$78,467
  Year Ended December 31, 2013
  
Parent
Company
 
Combined
Guarantor
Subsidiaries
 
Combined
Non-
Guarantor
Subsidiaries
 Eliminations Consolidated
Total revenues 
$6,490
 
$513,692
 
$—
 
$—
 
$520,182
Total costs and expenses 134,874
 349,782
 3
 762
 485,421
Income (loss) from continuing operations before income taxes (128,384) 163,910
 (3) (762) 34,761
Income tax (expense) benefit 44,934
 (57,369) 
 (468) (12,903)
Equity in income of subsidiaries 106,538
 
 
 (106,538) 
Income (loss) from continuing operations 
$23,088
 
$106,541
 
($3) 
($107,768) 
$21,858
Income from discontinued operations, net of income taxes 21,825
 
 
 
 21,825
Net income (loss) 
$44,913
 
$106,541
 
($3) 
($107,768) 
$43,683
  Year Ended December 31, 2016
  
Parent
Company
 
Combined
Guarantor
Subsidiaries
 
Combined
Non-
Guarantor
Subsidiaries
 Eliminations Consolidated
Total revenues 
$482
 
$443,112
 
$—
 
$—
 
$443,594
Total costs and expenses 208,054
 910,522
 
 492
 1,119,068
Loss before income taxes (207,572) (467,410) 
 (492) (675,474)
Income tax expense 
 
 
 
 
Equity in loss of subsidiaries (467,410) 
 
 467,410
 
Net loss 
($674,982) 
($467,410) 
$—
 
$466,918
 
($675,474)
Dividends on preferred stock 
 
 
 
 
Accretion on preferred stock 
 
 
 
 
Loss on redemption of preferred stock 
 
 
 
 
Net loss attributable to common shareholders 
($674,982) 
($467,410) 
$—
 
$466,918
 
($675,474)

F-32




CARRIZO OIL & GAS, INC.
CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS
(In thousands)
  Year Ended December 31, 2015
  
Parent
Company
 
Combined
Guarantor
Subsidiaries
 
Combined
Non-
Guarantor
Subsidiaries
 Eliminations Consolidated
Net cash provided by operating activities from continuing operations 
$2,655
 
$376,080
 
$—
 
$—
 
$378,735
Net cash used in investing activities from continuing operations (447,296) (674,758) 
 448,678
 (673,376)
Net cash provided by financing activities from continuing operations 480,767
 298,678
 
 (448,678) 330,767
Net cash used in discontinued operations (4,046) 
 
 
 (4,046)
Net increase in cash and cash equivalents 32,080
 
 
 
 32,080
Cash and cash equivalents, beginning of year 10,838
 
 
 
 10,838
Cash and cash equivalents, end of year 
$42,918
 
$—
 
$—
 
$—
 
$42,918
  Year Ended December 31, 2018
  
Parent
Company
 
Combined
Guarantor
Subsidiaries
 
Combined
Non-
Guarantor
Subsidiaries
 Eliminations Consolidated
Net cash provided by (used in) operating activities 
($269,318) 
$922,873
 
$—
 
$—
 
$653,555
Net cash provided by (used in) investing activities 126,905
 (792,383) 
 (130,490) (795,968)
Net cash provided by (used in) financing activities 135,155
 (130,490) 
 130,490
 135,155
Net decrease in cash and cash equivalents (7,258) 
 
 
 (7,258)
Cash and cash equivalents, beginning of year 9,540
 
 
 
 9,540
Cash and cash equivalents, end of year 
$2,282
 
$—
 
$—
 
$—
 
$2,282
  Year Ended December 31, 2014
  
Parent
Company
 
Combined
Guarantor
Subsidiaries
 
Combined
Non-
Guarantor
Subsidiaries
 Eliminations Consolidated
Net cash provided by (used in) operating activities from continuing operations 
($132,683) 
$634,970
 
($12) 
$—
 
$502,275
Net cash used in investing activities from continuing operations (305,718) (906,509) (37,609) 309,160
 (940,676)
Net cash provided by financing activities from continuing operations 300,290
 271,539
 37,621
 (309,160) 300,290
Net cash used in discontinued operations (8,490) 
 
 
 (8,490)
Net decrease in cash and cash equivalents (146,601) 
 
 
 (146,601)
Cash and cash equivalents, beginning of year 157,439
 
 
 
 157,439
Cash and cash equivalents, end of year 
$10,838
 
$—
 
$—
 
$—
 
$10,838
  Year Ended December 31, 2017
  
Parent
Company
 
Combined
Guarantor
Subsidiaries
 
Combined
Non-
Guarantor
Subsidiaries
 Eliminations Consolidated
Net cash provided by (used in) operating activities 
($121,107) 
$544,088
 
$—
 
$—
 
$422,981
Net cash used in investing activities (615,364) (1,155,340) 
 611,252
 (1,159,452)
Net cash provided by financing activities 741,817
 611,252
 
 (611,252) 741,817
Net increase in cash and cash equivalents 5,346
 
 
 
 5,346
Cash and cash equivalents, beginning of year 4,194
 
 
 
 4,194
Cash and cash equivalents, end of year 
$9,540
 
$—
 
$—
 
$—
 
$9,540
  Year Ended December 31, 2013
  
Parent
Company
 
Combined
Guarantor
Subsidiaries
 
Combined
Non-
Guarantor
Subsidiaries
 Eliminations Consolidated
Net cash provided by (used in) operating activities from continuing operations 
($55,888) 
$423,366
 
($4) 
$—
 
$367,474
Net cash used in investing activities from continuing operations (86,322) (513,710) (2,057) 92,204
 (509,885)
Net cash provided by financing activities from continuing operations 120,326
 90,143
 2,061
 (92,204) 120,326
Net cash provided by (used in) discontinued operations 127,429
 
 (519) 
 126,910
Net increase (decrease) in cash and cash equivalents 105,545
 (201) (519) 
 104,825
Cash and cash equivalents, beginning of year 51,894
 201
 519
 
 52,614
Cash and cash equivalents, end of year 
$157,439
 
$—
 
$—
 
$—
 
$157,439
  Year Ended December 31, 2016
  
Parent
Company
 
Combined
Guarantor
Subsidiaries
 
Combined
Non-
Guarantor
Subsidiaries
 Eliminations Consolidated
Net cash provided by (used in) operating activities 
($34,773) 
$307,541
 
$—
 
$—
 
$272,768
Net cash used in investing activities (312,291) (575,824) (740) 269,023
 (619,832)
Net cash provided by financing activities 308,340
 268,283
 740
 (269,023) 308,340
Net decrease in cash and cash equivalents (38,724) 
 
 
 (38,724)
Cash and cash equivalents, beginning of year 42,918
 
 
 
 42,918
Cash and cash equivalents, end of year 
$4,194
 
$—
 
$—
 
$—
 
$4,194

F-33




16.15. Supplemental Cash Flow Information
Supplemental cash flow disclosures to the consolidated statements of cash flowsand non-cash investing and financing activities are presented below:
  Years Ended December 31,
  2015 2014 2013
   (In thousands)
Net cash provided by operating activities:      
Cash paid for interest, net of amounts capitalized 
$64,692
 
$49,379
 
$50,770
Cash paid for income taxes 
 
 505
       
Non-cash investing and financing activities:      
Capital expenditures included in accounts payable and accrued capital expenditures 
$90,008
 
$176,886
 
$114,988
Other non-cash investing activities (1) 27,415
 6,789
 10,698
Purchase price adjustments related to the Eagle Ford Shale Acquisition 
 3,197
 
EFM deferred purchase payment 
 148,900
 
  Years Ended December 31,
  2018 2017 2016
   (In thousands)
Operating activities:      
Cash paid for interest, net of amounts capitalized 
$59,846
 
$77,213
 
$75,231
Cash paid for income taxes 
 
 
       
Investing activities:      
Increase (decrease) in capital expenditure payables and accruals 
($53,722) 
$102,272
 
($21,492)
       
Supplemental non-cash investing activities:      
Fair value of contingent consideration assets on date of divestiture (7,880) (8,805) 
Fair value of contingent consideration liabilities on date of acquisition 
 52,300
 
Liabilities assumed in connection with the Sanchez Acquisition 
 
 4,880
Stock-based compensation expense capitalized to oil and gas properties 4,124
 4,482
 4,591
Asset retirement obligations capitalized to oil and gas properties 2,132
 3,726
 1,927
       
Supplemental non-cash financing activities: 

 

 

Non-cash loss on extinguishment of debt, net 3,586
 1,357
 
(1)Other non-cash investing activities includes items such as capital lease transactions, non-cash property exchanges, non-cash capitalized ARO additions and other non-cash activity.
17. 16.Subsequent Events (Unaudited)
In February 2016,Hedging
Subsequent to December 31, 2018, the Company entered into the following oilcommodity derivative instruments at weighted average contract volumes and gas derivative instruments:prices:
Period Type of Contract 
Crude Oil Volumes
(in Bbls/d)
 
Weighted Average
Floor Price
($/Bbl)
January - June 2017 Fixed Price Swaps 6,000
 
$50.27
Commodity Period Type of Contract Index Volumes
(Bbls per day)
 Fixed Price
($ per Bbl)
 Sub-Floor
Price
($ per
Bbl)
 
Floor
Price
($ per
Bbl)
 
Ceiling
Price
($ per
Bbl)
Crude oil 2020 Price Swaps NYMEX WTI 3,000
 
$55.06
 
 
 
Crude oil 2020 Three-Way Collars NYMEX WTI 6,000
 
 
$45.00
 
$55.00
 
$64.69
Contingent Consideration Arrangements
Period Type of Contract 
Natural Gas Volumes
(in MMBtu/d)
 Weighted Average Ceiling Price ($/MMBtu)
FY 2017 Sold Call Options 33,000
 
$3.00
FY 2018 Sold Call Options 33,000
 
$3.25
FY 2019 Sold Call Options 33,000
 
$3.25
FY 2020 Sold Call Options 33,000
 
$3.50
The Company sold out-of-the-money natural gas call options for the years 2017 through 2020 and used the associated premium value to obtain a higher weighted average fixed price of $50.27 per Bbl on newly executed crude oil fixed price swaps for the first half ofFor the year 2017. These out-of-the-money natural gas call options and in-the-money crude oil fixed price swaps were executed contemporaneously withended December 31, 2018, the same counterparty, therefore, no cash premiums were paid to or received from the counterparty as the premium value associated with the natural gas call options was immediately appliedspecified pricing thresholds related to the crude oil fixed price swaps forContingent ExL Consideration, the first halfContingent Niobrara Consideration, and the Contingent Utica Consideration were exceeded. As a result, in January 2019, we paid $50.0 million and received $10.0 million from settlement of the year 2017.these contingent consideration arrangements.

F-34



18.17. Supplemental Disclosures about Oil and Gas Producing Activities (Unaudited)
As of December 31, 2015, 2014 and 2013, the Company’s oil and gas properties are located in the U.S. As of January 1, 2013, the Company also had oil and gas properties located in the U.K. All information presented as “U.K.” in this footnote relates to the U.K. discontinued operations. For additional information see “Note 3. Discontinued Operations.”
Costs Incurred
Costs incurred in oil and gas property acquisition, exploration and development activities are summarized below:
 Years Ended December 31, Years Ended December 31,
 2015 2014 2013 2018 2017 2016
 (In thousands) (In thousands)
U.S.      
Property acquisition costs            
Proved property acquisition costs 
$—
 
$183,633
 
$—
Unproved property acquisition costs 63,446
 215,021
 254,099
Proved properties 
$47,370
 
$303,307
 
$90,661
Unproved properties 182,220
 525,061
 113,535
Total property acquisition costs 63,446
 398,654
 254,099
 229,590
 828,368
 204,196
Exploration costs 117,227
 194,956
 106,329
 48,570
 91,098
 37,508
Development costs 389,396
 530,268
 423,871
 809,637
 569,982
 374,134
Total costs incurred 
$570,069
 
$1,123,878
 
$784,299
 
$1,087,797
 
$1,489,448
 
$615,838


Costs incurred exclude capitalized interest on U.S. unproved properties of $32.1$36.6 million, $34.5$28.3 million, and $29.9$17.0 million for the years ended December 31, 2015, 20142018, 2017 and 2013,2016, respectively. Included in exploration and development costs are non-cash additions related to the estimated future asset retirement obligations of the Company’s oil and gas wellsproperties of $4.9$1.9 million, $4.5$3.5 million and $3.7$1.9 million for the years ended December 31, 2015, 20142018, 2017 and 2013,2016, respectively. Non-cash additions related to the estimated future asset retirement obligations associated with the Devon Acquisition of $0.2 million, the ExL Acquisition of $0.1 million, and the Sanchez Acquisition of $2.0 million are included in acquisition costs of proved properties for the years ended December 31, 2018, 2017 and 2016, respectively. The internal cost of employee compensation and benefits, including stock-based compensation, capitalized to proved or unproved oil and gas properties of $17.0 million, $14.8 million and $10.5 million for the years ended December 31, 2018, 2017 and 2016, respectively, are included in exploration, development and unproved property acquisition costs.
Proved Oil and Gas Reserve Quantities
Proved oil and gas reserves are generally those quantities of crude oil, NGLs and natural gas, which by analysis of geoscience and engineering data, can be estimated with reasonable certainty to be economically producible in future years from known reservoirs under existing economic conditions, operating methods and government regulations. Proved developed reserves include proved reserves that can be expected to be produced through existing wells with existing equipment and operating methods or in which the cost of the required equipment is relatively minor compared to the cost of a new well. Proved undeveloped reserves are generally provedinclude reserves that are expected to be recovered from new wells on undrilled acreage or from existing wells where a relatively major expenditure is required for recompletion.
Proved oil and gas reserve quantities at December 31, 20152018, 20142017, and 20132016 and the related discounted future net cash flows before income taxes are based on estimates prepared by Ryder Scott Company, L.P. Such estimates have been prepared in accordance with guidelines established by the SEC. All of the Company’s proved reserves are attributable to properties within the United States. 

F-35




The Company’s net proved oil and gas reserves and changes in net proved oil and gas reserves which are located in the U.S. and U.K., are summarized below:as follows:
 Crude Oil and Condensate (MBbls) Natural Gas Liquids (MBbls)
 U.S. U.K. Worldwide U.S. U.K. Worldwide 
Crude Oil
(MBbls)
 
NGLs
(MBbls)
 
Natural Gas
(MMcf)
 
Total
Proved Reserves
(MBoe)
Proved reserves:                    
January 1, 2013 39,075
 5,241
 44,316
 5,383
 
 5,383
Extensions and discoveries 27,295
 
 27,295
 2,992
 
 2,992
Revisions of previous estimates 778
 
 778
 308
 
 308
Sales of reserves in place (876) (5,241) (6,117) 
 
 
Production (4,231) 
 (4,231) (531) 
 (531)
December 31, 2013 62,041
 
 62,041
 8,152
 
 8,152
January 1, 2016 109,588
 20,221
 244,938
 170,632
Extensions and discoveries 29,793
 
 29,793
 3,681
 
 3,681
 40,074
 8,612
 59,318
 58,572
Revisions of previous estimates 3,046
 
 3,046
 1,270
 
 1,270
 (16,731) (3,230) 1,481
 (19,713)
Purchases of reserves in place 12,730
 
 12,730
 1,335
 
 1,335
 4,810
 122
 7,282
 6,145
Production (6,906) 
 (6,906) (925) 
 (925) (9,423) (1,788) (25,574) (15,473)
December 31, 2014 100,704
 
 100,704
 13,513
 
 13,513
December 31, 2016 128,318
 23,937
 287,445
 200,163
Extensions and discoveries 26,358
 
 26,358
 5,292
 
 5,292
 50,476
 13,781
 98,980
 80,754
Revisions of previous estimates (9,059) 
 (9,059) 2,768
 
 2,768
 (19,838) (909) 27,774
 (16,118)
Purchases of reserves in place 21,634
 8,642
 94,962
 46,103
Sales of reserves in place (650) (526) (170,219) (29,546)
Production (8,415) 
 (8,415) (1,352) 
 (1,352) (12,566) (2,327) (28,472) (19,639)
December 31, 2015 109,588
 
 109,588
 20,221
 
 20,221
December 31, 2017 167,374
 42,598
 310,470
 261,717
Extensions and discoveries 65,352
 30,195
 212,758
 131,007
Revisions of previous estimates (31,287) 1,936
 (6,006) (30,352)
Purchases of reserves in place 2,205
 967
 7,953
 4,498
Sales of reserves in place (9,676) (2,872) (17,475) (15,461)
Production (14,232) (3,701) (24,639) (22,040)
December 31, 2018 179,736
 69,123
 483,061
 329,369
                    
Proved developed reserves:                    
December 31, 2013 18,321
 
 18,321
 2,779
 
 2,779
December 31, 2014 35,238
 
 35,238
 5,294
 
 5,294
December 31, 2015 42,311
 
 42,311
 7,933
 
 7,933
 42,311
 7,933
 154,725
 76,032
December 31, 2016 51,062
 9,387
 187,054
 91,625
December 31, 2017 69,632
 17,447
 131,355
 108,972
December 31, 2018 75,267
 25,809
 178,941
 130,899
                    
Proved undeveloped reserves:                    
December 31, 2013 43,720
 
 43,720
 5,373
 
 5,373
December 31, 2014 65,466
 
 65,466
 8,219
 
 8,219
December 31, 2015 67,277
 
 67,277
 12,288
 
 12,288
 67,277
 12,288
 90,213
 94,600
December 31, 2016 77,256
 14,550
 100,391
 108,538
December 31, 2017 97,742
 25,151
 179,115
 152,745
December 31, 2018 104,469
 43,314
 304,120
 198,470
Crude oil, condensateExtensions and natural gas liquidsdiscoveries
For the year ended December 31, 2018, the Company added 12,687 MBoe of proved developed reserves and 118,320 MBoe of proved undeveloped reserves through its drilling program and associated offset locations. Eagle Ford and Delaware Basin comprised 30% and 70%, respectively, of the total extensions and discoveriesdiscoveries.
For the year ended December 31, 2017, the Company added 6,473 MBoe of proved developed reserves and 74,281 MBoe of proved undeveloped reserves through its drilling program and associated offset locations. Eagle Ford and Delaware Basin comprised 51% and 48%, respectively, of the total extensions and discoveries.
For the year ended December 31, 2016, the Company added 6,525 MBoe of proved developed reserves and 52,047 MBoe of proved undeveloped reserves through its drilling program and associated offset locations. Eagle Ford and Delaware Basin comprised 79% and 20%, respectively, of the total extensions and discoveries.
Revisions of previous estimates
For the year ended December 31, 2018, revisions of previous estimates reduced the Company’s proved reserves by 30,352 MBoe. Included in revisions of previous estimates were:
Positive revisions due to price of 3,764 MBoe.


Net negative revisions of 12,363 MBoe primarily due to negative revisions of 14,907 MBoe in the Eagle Ford, partially offset by positive revisions of 2,544 MBoe in the Delaware Basin. The negative revisions in the Eagle Ford were primarily a result of completion of new wells that negatively impacted the production of adjacent existing producing wells and the associated impact to certain PUD locations, as well as a reduction in spacing and the average lateral length for certain PUD locations.
Negative revisions of 21,753 MBoe, primarily in the Eagle Ford due to changes in the Company’s previously approved development plan which resulted in the timing of development for certain PUD locations to move beyond five years from initial booking. The primary drivers of the changes in our previously approved development plan are the reallocation of capital to areas providing the greatest opportunities to increase capital efficiency and maximize project-level economics within our reduced capital expenditure plan, which includes a shift to larger-scale development projects.
For the year ended December 31, 2017, revisions of previous estimates reduced the Company’s proved reserves by 16,118 MBoe. Included in revisions of previous estimates were:
Positive revisions due to price of 2,684 MBoe.
Negative revisions of 4,500 MBoe primarily attributablein the Eagle Ford due to a downward shift of the type curve for certain PUD locations partially offset by positive revisions due to well performance in Marcellus which occurred prior to the following:sale in November 2017.
2015 AdditionsNegative revisions in proved undeveloped reserves of U.S.14,302 MBoe in the Eagle Ford due to changes in the Company’s previously approved development plan which resulted in the timing of development for certain PUD locations to move beyond five years from initial booking. The drivers of the changes in the Company’s previously approved development plan were the ExL Acquisition and the move to a more efficient development plan which includes drilling and completing larger pads.
For the year ended December 31, 2016, revisions of previous estimates reduced the Company’s proved reserves by 19,713 MBoe. Included in revisions of previous estimates were:
Negative revisions due to price of 6,705 MBoe primarily due to the decline in the 12-Month Average Realized price for crude oil, of which 3,228 MBoe related to proved developed and proved undeveloped locations that were no longer economic and 3,477 MBoe related to reductions in the level of economic reserves in proved developed and proved undeveloped reserve locations due to loss of tail reserves;
Negative revisions of 6,083 MBoe primarily in Eagle Ford as the EURs for certain PUD locations were reduced as a result of drillingtighter spacing and shorter lateral lengths partially offset locations, of which 92% wasby positive revisions in the Eagle Ford.Marcellus;
2014 Additions of U.S.Negative revisions in proved developed and undeveloped reserves as a result of drilling and offset locations6,925 MBoe in the Eagle Ford due to changes in the Company’s previously approved development plan which resulted in the timing of development for certain PUD locations to move beyond five years from initial booking. The drivers of the changes in the Company’s previously approved development plan were the move to a more efficient development plan which includes drilling and completing larger pads and the Niobrara.recent Sanchez Acquisition.
2013 AdditionsPurchases of U.S. proved developed and undeveloped reserves as a result of drilling and offset locations in place
For the Eagle Ford and the Niobrara.
Crude oil, condensate and natural gas liquids revisions of previous estimates are primarily attributable to the following:
2015 Negative price revisions as a result of the significant decrease in the oil price used to calculate our proved oil reserves estimates of 11,194 MBbls, partially offset by positive performance revisions of 4,904 MBbls.
Crude oil, condensate and natural gas liquidsyear ended December 31, 2018, purchases of reserves in place are primarily attributable to the following:
2014 Acquisitionincluded 4,498 MBoe of proved developed reserves associated with the Devon Acquisition.
For the year ended December 31, 2017, purchases of reserves in place included 26,009 MBoe of proved developed reserves and 20,094 MBoe of proved undeveloped reserves from Eagle Ford Minerals, LLC.associated with the ExL Acquisition.
Crude oil, condensateFor the year ended December 31, 2016, purchases of reserves in place included 4,978 MBoe of proved developed reserves and natural gas liquids1,167 MBoe of proved undeveloped reserves associated with the Sanchez Acquisition.
Sales of reserves in place
For the year ended December 31, 2018, sales of reserves in place are primarily attributable to the following:
2013 Sales of U.K. North Sea properties to Iona Energy during the first quarter and sales of U.S. properties in East Texas in the third quarter.

F-36



  Natural Gas (MMcf) Oil-Equivalent Proved Reserves (MBoe)
  U.S. U.K. Worldwide U.S. U.K. Worldwide
Proved reserves:            
January 1, 2013 423,672
 4,664
 428,336
 115,070
 6,018
 121,088
Extensions and discoveries 73,360
 
 73,360
 42,514
 
 42,514
Revisions of previous estimates 29,819
 
 29,819
 6,055
 
 6,055
Sales of reserves in place (307,472) (4,664) (312,136) (52,121) (6,018) (58,139)
Production (31,422) 
 (31,422) (9,999) 
 (9,999)
December 31, 2013 187,957
 
 187,957
 101,519
 
 101,519
Extensions and discoveries 30,343
 
 30,343
 38,531
 
 38,531
Revisions of previous estimates 18,913
 
 18,913
 7,469
 
 7,469
Purchases of reserves in place 8,681
 
 8,681
 15,512
 
 15,512
Production (24,877) 
 (24,877) (11,978) 
 (11,978)
December 31, 2014 221,017
 
 221,017
 151,053
 
 151,053
Extensions and discoveries 33,925
 
 33,925
 37,304
 
 37,304
Revisions of previous estimates 11,808
 
 11,808
 (4,323) 
 (4,323)
Production (21,812) 
 (21,812) (13,402) 
 (13,402)
December 31, 2015 244,938
 
 244,938
 170,632
 
 170,632
             
Proved developed reserves:            
December 31, 2013 106,976
 
 106,976
 38,929
 
 38,929
December 31, 2014 149,697
 
 149,697
 65,482
 
 65,482
December 31, 2015 154,725
 
 154,725
 76,032
 
 76,032
             
Proved undeveloped reserves:            
December 31, 2013 80,981
 
 80,981
 62,590
 
 62,590
December 31, 2014 71,320
 
 71,320
 85,571
 
 85,571
December 31, 2015 90,213
 
 90,213
 94,600
 
 94,600
Natural gas extensions and discoveries are primarily attributable to the following:
2015 Additions of U.S. proved developed and undeveloped reserves as a result of drilling and offset locations, of which 81% was in the Eagle Ford.
2014 Additions of U.S. proved developed and undeveloped reserves as a result of drilling and offset locations in the Marcellus and Eagle Ford.
2013 Additions of U.S. proved developed and undeveloped reserves as a result of drilling and offset locations in the Marcellus and Eagle Ford.
Natural gas revisions of previous estimates are primarily attributable to the following:
2015 Positive performance revisions of 39,715 MMcf, partially offset by negative price revisions of 27,908 MMcf.
2014 Positive price revisions in the U.S. primarily in the Marcellus.
2013 Positive price revisions in the U.S. primarily in the Marcellus.
Natural gas purchases of reserves in place are primarily attributable to the following:
2014 Acquisitionincluded 13,465 MBoe of proved developed reserves and 1,996 MBoe of proved undeveloped reserves fromassociated with the Eagle Ford Minerals, LLC.and Niobrara Formation divestitures.
Natural gasFor the year ended December 31, 2017, sales of reserves in place are primarily attributable toincluded 22,249 MBoe of proved developed reserves and 7,297 MBoe of proved undeveloped reserves associated with the following:Marcellus Shale and Utica Shale divestitures.
2013 SaleThere were no sales of U.S. propertiesreserves in place for the Barnett Shale to EnerVest during the fourth quarter and U.K. properties to Iona during the first quarter.year ended December 31, 2016.

F-37




Standardized Measure
The standardized measure of discounted future net cash flows relating to proved oil and gas reserves is as follows:
  December 31,
  2018 2017 2016
  (In thousands)
Future cash inflows 
$14,461,143
 
$10,109,752
 
$5,903,629
Future production costs (4,572,397) (3,202,201) (2,241,928)
Future development costs (1,964,450) (1,699,909) (1,264,493)
Future income taxes (1)
 (1,005,837) (445,056) 
Future net cash flows 6,918,459
 4,762,586
 2,397,208
Less 10% annual discount to reflect timing of cash flows (3,282,901) (2,297,544) (1,093,779)
Standardized measure of discounted future net cash flows 
$3,635,558
 
$2,465,042
 
$1,303,429
(1)U.S.
(In thousands)
2013
Future cash inflows
$6,936,276
Future production costs(1,629,663)
Future development costs(1,340,722)
Future income taxes(835,840)
Future net cash flows3,130,051
Less 10% annual discount to reflect timing in the calculation of cash flows(1,508,640)
Standardthe standardized measure of discounted future net cash flows
$1,621,411
2014
Future cash inflows
$10,380,951
Future production costs(2,532,106)
Future development costs(1,680,795)
Future income taxes(1,354,524)
Future were zero as of December 31, 2016, as the historical tax basis of proved oil and gas properties, net cash flows4,813,526
Less 10% annual discount to reflect timing of cash flows(2,258,444)
Standard measure of discountedoperating loss carryforwards, and future tax deductions exceeded the undiscounted future net cash flows
$2,555,082
2015
Future cash inflows
$5,878,348
Future production costs(2,124,059)
Future development costs(1,178,773)
Future before income taxes
Future net cash flows2,575,516
Less 10% annual discount to reflect timing of cash flows(1,210,292)
Standard measurethe Company’s proved oil and gas reserves as of discounted future net cash flows
$1,365,224
December 31, 2016.
ReserveProved reserve estimates and future cash flows are based on the average realized prices for sales of crude oil, NGLs and natural gas on the first calendar day of each month during the year. The following average realized prices were used for 2015, 2014in the calculation of proved reserves and 2013 were $47.24, $92.24, and $99.44 per Bbl, respectively, for crude oil and condensate, $12.00, $27.80 and $25.60 per Bbl, respectively, for natural gas liquids, and $1.87, $3.24 and $2.97 per Mcf, respectively, for natural gas.the standardized measure of discounted future net cash flows.
  Years Ended December 31,
  2018 2017 2016
Crude oil ($/Bbl) 
$63.80
 
$49.87
 
$39.60
NGLs ($/Bbl) 
$26.15
 
$19.78
 
$11.66
Natural gas ($/Mcf) 
$2.46
 
$2.96
 
$1.89
Future operating and development costs are computed primarily by the Company’s petroleum engineers by estimating the expenditures to be incurred in developing and producing the Company’s proved oil and gas reserves at the end of the year, based on current costs and assuming continuation of existing economic conditions. Future income taxes, which include the effects of the Tax Cuts and Jobs Act for the years ended December 31, 2018 and 2017, are based on year-endcurrent statutory rates, adjusted for the tax basis of oil and gas properties and available applicable tax assets. A discount factor of 10% was used to reflect the timing of future net cash flows. The standardized measure of discounted future net cash flows is not intended to represent the replacement cost or fair value of the Company’s oil and gas properties. An estimate of fair value would also take into account, among other things, the recovery of reserves not presently classified as proved, anticipated future changes in prices and costs, and a discount factor more representative of the time value of money and the risks inherent in oil and gasproved reserve estimates.


F-38



Changes in Standardized Measure
Changes in the standardized measure of discounted future net cash flows relating to proved oil and gas reserves are summarized below: 
 U.S. U.K. Worldwide Years Ended December 31,
 (In thousands) 2018 2017 2016
Standardized measure — January 1, 2013 
$1,179,483
 
$238,912
 
$1,418,395
 (In thousands)
Standardized measure at beginning of year 
$2,465,042
 
$1,303,429
 
$1,365,224
Revisions to reserves proved in prior years:            
Net change in sales prices and production costs related to future production (232,361) 
 (232,361) 
$809,182
 
$710,773
 
($346,763)
Net change in estimated future development costs (10,602) 
 (10,602) (9,627) (51,854) 74,407
Net change due to revisions in quantity estimates 205,686
 
 205,686
 (250,817) (42,214) (150,245)
Accretion of discount 141,229
 44,160
 185,389
 263,837
 130,343
 136,522
Changes in production rates (timing) and other 56,052
 (44,160) 11,892
 (19,539) (116,056) (111,137)
Total revisions 160,004
 
 160,004
Total revisions to reserves proved in prior years 793,036
 630,992
 (397,216)
Net change due to extensions and discoveries, net of estimated future development and production costs 873,028
 
 873,028
 1,127,748
 597,502
 313,201
Net change due to sales of minerals in place (191,155) (441,597) (632,752)
Sales of oil and gas produced, net of production costs (444,841) 
 (444,841)
Net change due to purchases of reserves in place 60,264
 452,932
 43,426
Net change due to divestitures of reserves in place (181,308) (106,608) 
Sales of crude oil, NGLs and natural gas produced, net of production costs (843,333) (566,258) (320,272)
Previously estimated development costs incurred 217,395
 
 217,395
 496,600
 326,383
 299,066
Net change in income taxes (172,503) 202,685
 30,182
 (282,491) (173,330) 
Net change in standardized measure of discounted future net cash flows 441,928
 (238,912) 203,016
 1,170,516
 1,161,613
 (61,795)
Standardized measure — December 31, 2013 
$1,621,411
 
$—
 
$1,621,411
Revisions to reserves proved in prior years:      
Net change in sales prices and production costs related to future production 
($240,533) 
$—
 
($240,533)
Net change in estimated future development costs 89,401
 
 89,401
Net change due to revisions in quantity estimates 205,166
 
 205,166
Accretion of discount 202,672
 
 202,672
Changes in production rates (timing) and other (61,099) 
 (61,099)
Total revisions 195,607
 
 195,607
Net change due to extensions and discoveries, net of estimated future development and production costs 867,615
 
 867,615
Net change due to purchases of minerals in place 352,867
 
 352,867
Sales of oil and gas produced, net of production costs (598,036) 
 (598,036)
Previously estimated development costs incurred 415,963
 
 415,963
Net change in income taxes (300,345) 
 (300,345)
Net change in standardized measure of discounted future net cash flows 933,671
 
 933,671
Standardized measure — December 31, 2014 
$2,555,082
 
$—
 
$2,555,082
Revisions to reserves proved in prior years:      
Net change in sales prices and production costs related to future production 
($2,547,213) 
$—
 
($2,547,213)
Net change in estimated future development costs 342,238
 
 342,238
Net change due to revisions in quantity estimates (157,271) 
 (157,271)
Accretion of discount 326,074
 
 326,074
Changes in production rates (timing) and other (139,533) 
 (139,533)
Total revisions (2,175,705) 
 (2,175,705)
Net change due to extensions and discoveries, net of estimated future development and production costs 252,155
 
 252,155
Sales of oil and gas produced, net of production costs (312,213) 
 (312,213)
Previously estimated development costs incurred 340,247
 
 340,247
Net change in income taxes 705,658
 
 705,658
Net change in standardized measure of discounted future net cash flows (1,189,858) 
 (1,189,858)
Standardized measure — December 31, 2015 
$1,365,224
 
$—
 
$1,365,224
Standardized measure at end of year 
$3,635,558
 
$2,465,042
 
$1,303,429

F-39



19. Selected18. Quarterly Financial Data (Unaudited)
The following table presents selectedis a summary of the unaudited quarterly financial data for the years ended December 31, 20152018 and 2014:2017:
2015First Second Third Fourth
 (In thousands, except per share amounts)
Total revenues
$100,050
 
$123,494
 
$106,237
 
$99,422
Loss from continuing operations (1)(2)(3)
($21,476) 
($46,970) 
($708,768) 
($380,671)
Net loss
($21,210) 
($46,132) 
($707,647) 
($380,165)
        
Net loss per common share - basic       
Loss from continuing operations
($0.46) 
($0.92) 
($13.75) 
($6.73)
Net loss per common share
($0.46) 
($0.90) 
($13.73) 
($6.72)
        
Net loss per common share - diluted       
Loss from continuing operations
($0.46) 
($0.92) 
($13.75) 
($6.73)
Net loss per common share
($0.46) 
($0.90) 
($13.73) 
($6.72)
Year Ended December 31, 2018
First Quarter (3)
 
Second Quarter (4) 
 Third Quarter 
Fourth Quarter (5)
 (In thousands, except per share amounts)
Total revenues
$225,280
 
$263,973
 
$303,375
 
$273,314
Operating profit (1)

$108,992
 
$140,265
 
$165,141
 
$129,405
Net income
$27,492
 
$35,309
 
$81,346
 
$260,280
Net income attributable to common shareholders
$14,743
 
$30,095
 
$76,118
 
$255,120
        
Net income attributable to common shareholders per
common share (2)
       
Basic
$0.18
 
$0.37
 
$0.88
 
$2.79
Diluted
$0.18
 
$0.36
 
$0.85
 
$2.75
2014First Second Third Fourth
 (In thousands, except per share amounts)
Total revenues
$157,212
 
$193,475
 
$196,225
 
$163,275
Income from continuing operations
$6,621
 
$3,214
 
$82,997
 
$129,451
Net income
$5,976
 
$2,319
 
$83,789
 
$134,259
        
Net income per common share - basic       
Income from continuing operations
$0.15
 
$0.07
 
$1.83
 
$2.85
Net income per common share
$0.13
 
$0.05
 
$1.85
 
$2.96
        
Net income per common share - diluted       
Income from continuing operations
$0.14
 
$0.07
 
$1.80
 
$2.80
Net income per common share
$0.13
 
$0.05
 
$1.82
 
$2.91
Year Ended December 31, 2017First Quarter Second Quarter 
Third Quarter (6)
 
Fourth Quarter (7)
 (In thousands, except per share amounts)
Total revenues
$151,355
 
$166,483
 
$181,279
 
$246,771
Operating profit (1)

$57,953
 
$63,147
 
$69,364
 
$113,205
Net income (loss)
$40,021
 
$56,306
 
$7,823
 
($17,040)
Net income (loss) attributable to common shareholders
$40,021
 
$56,306
 
$5,574
 
($23,434)
        
Net income (loss) attributable to common shareholders per
common share (2)
       
Basic
$0.61
 
$0.86
 
$0.07
 
($0.29)
Diluted
$0.61
 
$0.85
 
$0.07
 
($0.29)
 
(1)InTotal revenues less lease operating expense, production taxes, ad valorem taxes and DD&A.


(2)The sum of quarterly net income (loss) attributable to common shareholders per common share does not agree with the secondtotal year net income (loss) attributable to common shareholders per common share as each computation is based on the weighted average of common shares outstanding during the period.
(3)First quarter of 2015,2018 included the Company recognized afollowing:
a.$29.6 million loss on derivatives, net
b.$8.7 million loss on extinguishment of debt of $38.1 million as a result of the cash tender offer and redemption of the 8.625%$320.0 million aggregate principal amount of 7.50% Senior Notes.
(2)b.In$7.1 million loss on redemption of preferred stock as a result of the third quarterredemption of 2015, the Company recognized an after-tax impairment in the carrying value50,000 shares of proved oil and gas properties of $522.7 million ($812.8 million pre-tax).Preferred Stock.
(3)(4)In the fourthSecond quarter of 2015,2018 included the Company recognized an after-tax impairment infollowing:
a.$67.7 million loss on derivatives, net
(5)Fourth quarter of 2018 included the carrying valuefollowing:
a.
$159.4 million gain on derivatives, net
(6)Third quarter of proved oil and gas properties2017 included the following:
a.$24.4 million loss on derivatives, net
(7)Fourth quarter of $273.12017 included the following:
a.$86.1 million ($411.6 million pre-tax).loss on derivatives, net.
The sum of the quarterly net income (loss) per common share may not agree with the net income (loss) per common share for the years ended December 31, 2015 and 2014 as each quarterly computation is based on the net income (loss) for each period and the weighted average common shares outstanding during each period.

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b.
$4.2 million loss on extinguishment of debt as a result of the redemption of $150.0 million aggregate principal amount of 7.50% Senior Notes.



SIGNATURES
Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the registrant has caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.
 
   
 CARRIZO OIL & GAS, INC.
   
 By:/s/ David L. Pitts
  David L. Pitts
  Vice President and Chief Financial Officer
Date: February 22, 201628, 2019
Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed below by the following persons on behalf of the registrant and in the capacities and on the dates indicated.
 
    
Name CapacityDate
    
/s/ S.P. Johnson IV President, Chief Executive Officer and DirectorFebruary 22, 201628, 2019
S. P. Johnson IV (Principal Executive Officer) 
    
/s/ David L. Pitts Vice President and Chief Financial OfficerFebruary 22, 201628, 2019
David L. Pitts (Principal Financial Officer) 
    
/s/ Gregory F. Conaway Vice President and Chief Accounting OfficerFebruary 22, 201628, 2019
Gregory F. Conaway (Principal Accounting Officer) 
    
/s/ Steven A. Webster Chairman of the BoardFebruary 22, 201628, 2019
Steven A. Webster
/s/ Frances Aldrich Sevilla-SacasaDirectorFebruary 28, 2019
Frances Aldrich Sevilla-Sacasa   
    
/s/ Thomas L. Carter, Jr. DirectorFebruary 22, 201628, 2019
Thomas L. Carter, Jr.   
    
/s/ Robert F. Fulton DirectorFebruary 22, 201628, 2019
Robert F. Fulton   
    
/s/ F. Gardner Parker DirectorFebruary 22, 201628, 2019
F. Gardner Parker   
    
/s/ Roger A. Ramsey DirectorFebruary 22, 201628, 2019
Roger A. Ramsey   
    
/s/ Frank A. Wojtek DirectorFebruary 22, 201628, 2019
Frank A. Wojtek   



S-1