Denbury (DNRWW) 10-Q 9 Aug 19 2019 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2019	Jul. 31, 2019
Document And Company Information [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2019
Document Transition Report	false
Entity File Number	001-12935
Entity Registrant Name	DENBURY RESOURCES INC.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	20-0467835
Entity Address, Address Line One	5320 Legacy Drive,
Entity Address, City or Town	Plano,
Entity Address, State or Province	TX
Entity Address, Postal Zip Code	75024
City Area Code	(972)
Local Phone Number	673-2000
Title of 12(b) Security	Common Stock $.001 Par Value
Trading Symbol	DNR
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		469,661,433
Entity Central Index Key	0000945764
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q2
Amendment Flag	false

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands		Jun. 30, 2019	Dec. 31, 2018
Current assets
Cash and cash equivalents		$ 341	$ 38,560
Accrued production receivable		135,697	125,788
Trade and other receivables, net		28,469	26,970
Derivative assets		24,447	93,080
Other current assets		14,989	11,896
Total current assets		203,943	296,294
Oil and natural gas properties (using full cost accounting)
Proved properties		11,275,255	11,072,209
Unevaluated properties		941,336	996,700
CO2 properties		1,198,657	1,196,795
Pipelines and plants		2,324,265	2,302,817
Other property and equipment		223,666	250,279
Less accumulated depletion, depreciation, amortization and impairment		(11,583,497)	(11,500,190)
Net property and equipment		4,379,682	4,318,610
Operating lease right-of-use assets		36,421	0
Derivative assets		9,488	4,195
Other assets		102,500	104,123
Total assets		4,732,034	4,723,222
Current liabilities
Accounts payable and accrued liabilities		180,283	198,380
Oil and gas production payable		63,034	61,288
Derivative liabilities		1,912	0
Current maturities of long-term debt (including future interest payable of $85,677 and $85,303, respectively - see Note 4)	[1]	101,829	105,125
Operating lease liabilities		6,739	0
Total current liabilities		353,797	364,793
Long-term liabilities
Long-term debt, net of current portion (including future interest payable of $121,982 and $164,914, respectively - see Note 4)		2,466,127	2,664,211
Asset retirement obligations		181,491	174,470
Derivative liabilities		22	0
Deferred tax liabilities, net		362,303	309,758
Operating lease liabilities		45,391	0
Other liabilities		52,227	68,213
Total long-term liabilities		3,107,561	3,216,652
Commitments and contingencies (Note 7)
Stockholders' equity
Preferred stock, $.001 par value, 25,000,000 shares authorized, none issued and outstanding		0	0
Common stock, $.001 par value, 750,000,000 shares authorized; 464,166,479 and 462,355,725 shares issued, respectively		464	462
Paid-in capital in excess of par		2,694,184	2,685,211
Accumulated deficit		(1,412,094)	(1,533,112)
Treasury stock, at cost, 2,474,904 and 1,941,749 shares, respectively		(11,878)	(10,784)
Total stockholders' equity		1,270,676	1,141,777
Total liabilities and stockholders' equity		$ 4,732,034	$ 4,723,222
[1]	Our current maturities of long-term debt as of June 30, 2019 include $85.7 million of future interest payable related to the 2021 Senior Secured Notes and 2022 Senior Secured Notes that is due within the next twelve months.

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands		Jun. 30, 2019	Dec. 31, 2018
Statement of Financial Position [Abstract]
Commitments and contingencies (Note 7)
Debt Instrument [Line Items]
Future interest payable - current	[1]	101,829	105,125
Future interest payable - long-term		$ 2,466,127	$ 2,664,211
Stockholders' equity
Preferred stock, par value		$ 0.001	$ 0.001
Preferred stock, shares authorized		25,000,000	25,000,000
Preferred stock, shares issued		0	0
Preferred stock, shares outstanding		0	0
Common stock, par value		$ 0.001	$ 0.001
Common stock, shares authorized		750,000,000
Common stock, shares issued		464,166,479	462,355,725
Treasury stock, shares		2,474,904	1,941,749
Future interest payable on senior secured notes
Debt Instrument [Line Items]
Future interest payable - current		$ 85,700	$ 85,303
Future interest payable - long-term		$ 121,982	$ 164,914
[1]	Our current maturities of long-term debt as of June 30, 2019 include $85.7 million of future interest payable related to the 2021 Senior Secured Notes and 2022 Senior Secured Notes that is due within the next twelve months.

Condensed Consolidated Statemen

Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Revenues and other income	$ 343,365	$ 387,063	$ 648,817	$ 740,297
Expenses
Taxes other than income	25,517	27,234	49,302	54,553
General and administrative expenses	17,506	19,412	36,431	39,644
Interest, net of amounts capitalized of $8,238, $8,851, $18,772 and $17,303, respectively	20,416	16,208	37,814	33,447
Depletion, depreciation, and amortization	58,264	52,944	115,561	105,395
Commodity derivatives expense (income)	(24,760)	96,199	58,617	145,024
Gain on debt extinguishment	(100,346)	0	(100,346)	0
Other expenses	2,386	4,178	6,524	7,564
Total expenses	131,296	347,410	473,181	647,046
Income before income taxes	212,069	39,653	175,636	93,251
Income tax provision	65,377	9,431	54,618	23,451
Net income	$ 146,692	$ 30,222	$ 121,018	$ 69,800
Net income per common share
Basic	$ 0.32	$ 0.07	$ 0.27	$ 0.17
Diluted	$ 0.32	$ 0.07	$ 0.26	$ 0.15
Weighted average common shares outstanding
Basic	452,612	433,467	452,169	413,217
Diluted	467,427	457,165	461,460	454,466
Other income
Revenues and other income	$ 2,367	$ 4,437	$ 4,457	$ 9,041
Transportation and marketing
Operating expenses	11,236	10,062	22,009	20,555
Oil, natural gas, and related product sales
Revenues and other income	330,421	375,565	624,998	715,586
Operating expenses	117,932	120,384	243,355	238,740
CO2
Revenues and other income	7,986	6,715	16,556	14,267
Operating expenses	581	500	1,137	962
Purchased oil sales
Revenues and other income	2,591	346	2,806	1,403
Operating expenses	$ 2,564	$ 289	$ 2,777	$ 1,162

Condensed Consolidated Statem_2

Condensed Consolidated Statements of Operations (Unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Expenses
Capitalized interest	$ 8,238	$ 8,851	$ 18,772	$ 17,303

Condensed Consolidated Statem_3

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Cash flows from operating activities
Net income (loss)	$ 121,018	$ 69,800
Adjustments to reconcile net income to cash flows from operating activities
Depletion, depreciation, and amortization	115,561	105,395
Deferred income taxes	52,545	25,237
Stock-based compensation	6,865	5,152
Commodity derivatives expense (income)	58,617	145,024
Receipt (payment) on settlements of commodity derivatives	6,657	(88,127)
Gain on debt extinguishment	(100,346)	0
Debt issuance costs and discounts	2,901	2,268
Other, net	(57)	(5,107)
Changes in assets and liabilities, net of effects from acquisitions
Accrued production receivable	(9,909)	(17,385)
Trade and other receivables	(271)	(320)
Other current and long-term assets	(3,389)	(5,627)
Accounts payable and accrued liabilities	(33,320)	14,999
Oil and natural gas production payable	1,746	(4,501)
Other liabilities	(5,618)	(1,182)
Net cash provided by operating activities	213,000	245,626
Cash flows from investing activities
Oil and natural gas capital expenditures	(148,254)	(134,458)
Pipelines and plants capital expenditures	(10,591)	(7,882)
Net proceeds from sales of oil and natural gas properties and equipment	431	2,077
Other	(725)	5,365
Net cash used in investing activities	(159,139)	(134,898)
Cash flows from financing activities
Bank repayments	(281,000)	(1,153,653)
Bank borrowings	361,000	1,093,653
Interest payments treated as a reduction of debt	(42,558)	(37,233)
Cash paid in conjunction with debt exchange	(120,007)	0
Costs of debt financing	(9,332)	0
Pipeline financing and capital lease debt repayments	(7,273)	(12,625)
Other	12,899	(628)
Net cash used in financing activities	(86,271)	(110,486)
Net increase (decrease) in cash, cash equivalents, and restricted cash	(32,410)	242
Cash, cash equivalents, and restricted cash at beginning of period	54,949	15,992
Cash, cash equivalents, and restricted cash at end of period	$ 22,539	$ 16,234

Condensed Consolidated Statem_4

Condensed Consolidated Statement of Changes in Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Common Stock ($.001 Par Value)	Paid-In Capital in Excess of Par	Retained Earnings (Accumulated Deficit)	Treasury Stock (at cost)
Beginning balance, shares at Dec. 31, 2017		402,549,346			457,041
Beginning balance at Dec. 31, 2017	$ 648,165	$ 403	$ 2,507,828	$ (1,855,810)	$ (4,256)
Issued or purchased pursuant to stock compensation plans, shares		378,595
Stock-based compensation, value	3,303		3,303
Tax withholding - stock compensation, shares					330,826
Tax withholding - stock compensation, value	(828)				$ (828)
Net income (loss)	39,578			39,578
Ending balance, shares at Mar. 31, 2018		402,927,941			787,867
Ending balance at Mar. 31, 2018	690,218	$ 403	2,511,131	(1,816,232)	$ (5,084)
Beginning balance, shares at Dec. 31, 2017		402,549,346			457,041
Beginning balance at Dec. 31, 2017	648,165	$ 403	2,507,828	(1,855,810)	$ (4,256)
Net income (loss)	69,800
Ending balance, shares at Jun. 30, 2018		458,214,377			806,318
Ending balance at Jun. 30, 2018	885,645	$ 458	2,676,352	(1,786,010)	$ (5,155)
Beginning balance, shares at Mar. 31, 2018		402,927,941			787,867
Beginning balance at Mar. 31, 2018	690,218	$ 403	2,511,131	(1,816,232)	$ (5,084)
Issued or purchased pursuant to stock compensation plans, shares		36,437
Issued pursuant to notes conversion, shares		55,249,999
Issued pursuant to notes conversion, value	162,050	$ 55	161,995
Stock-based compensation, value	3,226		3,226
Tax withholding - stock compensation, shares					18,451
Tax withholding - stock compensation, value	(71)				$ (71)
Net income (loss)	30,222			30,222
Ending balance, shares at Jun. 30, 2018		458,214,377			806,318
Ending balance at Jun. 30, 2018	$ 885,645	$ 458	2,676,352	(1,786,010)	$ (5,155)
Beginning balance, shares at Dec. 31, 2018	462,355,725	462,355,725			1,941,749
Beginning balance at Dec. 31, 2018	$ 1,141,777	$ 462	2,685,211	(1,533,112)	$ (10,784)
Issued or purchased pursuant to stock compensation plans, shares		1,331,050
Issued or purchased pursuant to stock compensation plans, value	2	$ 2
Issued pursuant to directors' compensation plan, shares		41,487
Stock-based compensation, value	4,306		4,306
Tax withholding - stock compensation, shares					531,494
Tax withholding - stock compensation, value	(1,091)				$ (1,091)
Net income (loss)	(25,674)			(25,674)
Ending balance, shares at Mar. 31, 2019		463,728,262			2,473,243
Ending balance at Mar. 31, 2019	$ 1,119,320	$ 464	2,689,517	(1,558,786)	$ (11,875)
Beginning balance, shares at Dec. 31, 2018	462,355,725	462,355,725			1,941,749
Beginning balance at Dec. 31, 2018	$ 1,141,777	$ 462	2,685,211	(1,533,112)	$ (10,784)
Net income (loss)	$ 121,018
Ending balance, shares at Jun. 30, 2019	464,166,479	464,166,479			2,474,904
Ending balance at Jun. 30, 2019	$ 1,270,676	$ 464	2,694,184	(1,412,094)	$ (11,878)
Beginning balance, shares at Mar. 31, 2019		463,728,262			2,473,243
Beginning balance at Mar. 31, 2019	1,119,320	$ 464	2,689,517	(1,558,786)	$ (11,875)
Issued or purchased pursuant to stock compensation plans, shares		400,850
Issued pursuant to directors' compensation plan, shares		37,367
Stock-based compensation, value	4,667		4,667
Tax withholding - stock compensation, shares					1,661
Tax withholding - stock compensation, value	(3)				$ (3)
Net income (loss)	$ 146,692			146,692
Ending balance, shares at Jun. 30, 2019	464,166,479	464,166,479			2,474,904
Ending balance at Jun. 30, 2019	$ 1,270,676	$ 464	$ 2,694,184	$ (1,412,094)	$ (11,878)

Basis of Presentation

Basis of Presentation	6 Months Ended
	Jun. 30, 2019
Accounting Policies [Abstract]
Basis of Presentation and Significant Accounting Policies	Note 1. Basis of Presentation Organization and Nature of Operations Denbury Resources Inc., a Delaware corporation, is an independent oil and natural gas company with operations focused in two key operating areas: the Gulf Coast and Rocky Mountain regions. Our goal is to increase the value of our properties through a combination of exploitation, drilling and proven engineering extraction practices, with the most significant emphasis relating to CO 2 enhanced oil recovery operations. Interim Financial Statements The accompanying unaudited condensed consolidated financial statements of Denbury Resources Inc. and its subsidiaries have been prepared in accordance with the rules and regulations of the Securities and Exchange Commission (“SEC”) and do not include all of the information and footnotes required by accounting principles generally accepted in the United States for complete financial statements. These financial statements and the notes thereto should be read in conjunction with our Annual Report on Form 10-K for the year ended December 31, 2018 (the “Form 10-K”). Unless indicated otherwise or the context requires, the terms “we,” “our,” “us,” “Company” or “Denbury,” refer to Denbury Resources Inc. and its subsidiaries. Accounting measurements at interim dates inherently involve greater reliance on estimates than at year end, and the results of operations for the interim periods shown in this report are not necessarily indicative of results to be expected for the year. In management’s opinion, the accompanying unaudited condensed consolidated financial statements include all adjustments of a normal recurring nature necessary for a fair statement of our consolidated financial position as of June 30, 2019 , our consolidated results of operations for the three and six months ended June 30, 2019 and 2018 , our consolidated cash flows for the six months ended June 30, 2019 and 2018 , and our consolidated statements of changes in stockholders’ equity for the three and six months ended June 30, 2019 and 2018 . Reclassifications Certain prior period amounts have been reclassified to conform to the current year presentation. On the Unaudited Condensed Consolidated Statements of Operations for the three and six months ended June 30, 2018, “Purchased oil sales” is a new line item and includes sales related to purchases of oil from third-parties, which were reclassified from “Other income,” “Purchased oil expenses” is a new line item and includes expenses related to purchases of oil from third-parties, which were reclassified from “Marketing and plant operating expenses” used in prior reports, and “Transportation and marketing expenses” is a new line item, previously captioned “Marketing and plant operating expenses,” but adjusted to exclude both expenses related to plant operating expenses, which were reclassified to “Other expenses,” and also purchases of oil from third-parties. Such reclassifications had no impact on our reported total revenues, expenses, net income , current assets, total assets, current liabilities, total liabilities or stockholders’ equity. Cash, Cash Equivalents, and Restricted Cash The following table provides a reconciliation of cash, cash equivalents, and restricted cash as reported within the Unaudited Condensed Consolidated Balance Sheets to “Cash, cash equivalents, and restricted cash at end of period” as reported within the Unaudited Condensed Consolidated Statements of Cash Flows: In thousands June 30, 2019 December 31, 2018 Cash and cash equivalents $ 341 $ 38,560 Restricted cash included in other assets 22,198 16,389 Total cash, cash equivalents, and restricted cash shown in the Unaudited Condensed Consolidated Statements of Cash Flows $ 22,539 $ 54,949 Amounts included in restricted cash included in “Other assets” in the accompanying Unaudited Condensed Consolidated Balance Sheets represent escrow accounts that are legally restricted for certain of our asset retirement obligations. Our prior-year quarterly report on Form 10-Q for the period ended June 30, 2018, filed with the SEC on August 9, 2018, previously disclosed balances of certain U.S. Treasury Notes of $24.6 million and $25.4 million as of January 1, 2018 and June 30, 2018, respectively, that should have been excluded from “Cash, cash equivalents, and restricted cash” on the Consolidated Statements of Cash Flows. Accordingly, “Cash, cash equivalents, and restricted cash” as of January 1, 2018 and June 30, 2018, originally reported as $40.6 million and $41.6 million , respectively, should have been reported as $16.0 million and $16.2 million , respectively. In addition, changes in the U.S. Treasury Notes of $0.8 million during the six months ended June 30, 2018 should have been included in net cash used in investing activities. Accordingly, net cash used in investing activities for the six months ended June 30, 2018, originally reported as $134.1 million , should have been $134.9 million . These revisions had no impact on the Company’s financial condition or results of operations for the periods presented. Net Income per Common Share Basic net income per common share is computed by dividing the net income attributable to common stockholders by the weighted average number of shares of common stock outstanding during the period. Diluted net income per common share is calculated in the same manner, but includes the impact of potentially dilutive securities. Potentially dilutive securities consist of nonvested restricted stock, nonvested performance-based equity awards, and shares into which our convertible senior notes are convertible . The following table sets forth the reconciliations of net income and weighted average shares used for purposes of calculating the basic and diluted net income per common share for the periods indicated: Three Months Ended Six Months Ended June 30, June 30, In thousands 2019 2018 2019 2018 Numerator Net income – basic $ 146,692 $ 30,222 $ 121,018 $ 69,800 Effect of potentially dilutive securities Interest on convertible senior notes including amortization of discount, net of tax 548 130 548 539 Net income – diluted $ 147,240 $ 30,352 $ 121,566 $ 70,339 Denominator Weighted average common shares outstanding – basic 452,612 433,467 452,169 413,217 Effect of potentially dilutive securities Restricted stock and performance-based equity awards 2,835 8,586 3,301 6,877 Convertible senior notes (1) 11,980 15,112 5,990 34,372 Weighted average common shares outstanding – diluted 467,427 457,165 461,460 454,466 (1) For the three and six months ended June 30, 2019, shares shown under “convertible senior notes” represent the prorated portion of the approximately 90.9 million shares of the Company’s common stock issuable upon full conversion of our convertible senior notes (see Note 4, Long-Term Debt – 2019 Note Exchanges ). Basic weighted average common shares exclude shares of nonvested restricted stock. As these restricted shares vest, they will be included in the shares outstanding used to calculate basic net income per common share (although time-vesting restricted stock is issued and outstanding upon grant). For purposes of calculating diluted weighted average common shares during the three and six months ended June 30, 2019 and 2018 , the nonvested restricted stock and performance-based equity awards are included in the computation using the treasury stock method, with the deemed proceeds equal to the average unrecognized compensation during the period, and for the shares underlying the convertible senior notes as if the convertible senior notes were converted at the beginning of the 2018 and 2019 periods. The following securities could potentially dilute earnings per share in the future, but were excluded from the computation of diluted net income per share, as their effect would have been antidilutive: Three Months Ended Six Months Ended June 30, June 30, In thousands 2019 2018 2019 2018 Stock appreciation rights 2,026 2,827 2,059 2,891 Restricted stock and performance-based equity awards 4,998 179 4,790 305 Recent Accounting Pronouncements Recently Adopted Leases. Effective January 1, 2019, we adopted Accounting Standards Update (“ASU”) 2016-02, Leases (“ASU 2016-02”), and ASU 2018-01, Leases (Topic 842) – Land Easement Practical Expedient for Transition to Topic 842 , using the modified retrospective method with an application date of January 1, 2019. ASU 2016-02 does not apply to mineral leases or leases that convey the right to explore for or use the land on which oil, natural gas, and similar natural resources are contained. We elected the practical expedients provided in the new ASUs that allow historical lease classification of existing leases, allow entities to recognize leases with terms of one year or less in their statement of operations, allow lease and non-lease components to be combined, and carry forward our accounting treatment for existing land easement agreements. The adoption of the new standards resulted in the recognition of $39.1 million of lease assets and $55.8 million of lease liabilities ( $16.7 million of which related to previously-existing lease obligations) as of January 1, 2019, in our Unaudited Condensed Consolidated Balance Sheets, but did not materially impact our results of operations and had no impact on our cash flows. The additional lease assets and liabilities recorded on our balance sheet primarily related to our operating leases for office space, as the accounting for our financing leases and pipeline financings was relatively unchanged. Not Yet Adopted Financial Instruments – Credit Losses. In June 2016, the FASB issued ASU 2016-13, Financial Instruments – Credit Losses (“ASU 2016-13”). ASU 2016-13 changes the impairment model for most financial assets and certain other instruments, including trade and other receivables, and requires the use of a new forward-looking expected loss model that will result in the earlier recognition of allowances for losses. The amendments in this ASU are effective for fiscal years beginning after December 15, 2019, and interim periods within those fiscal years, and early adoption is permitted. Entities must adopt the amendment using a modified retrospective approach to the first reporting period in which the guidance is effective. The adoption of ASU 2016-13 is currently not expected to have a material effect on our consolidated financial statements. Fair Value Measurement. In August 2018, the FASB issued ASU 2018-13, Fair Value Measurement (Topic 820) – Disclosure Framework – Changes to the Disclosure Requirements for Fair Value Measurements (“ASU 2018-13”). ASU 2018-13 adds, modifies, or removes certain disclosure requirements for recurring and nonrecurring fair value measurements based on the FASB’s consideration of costs and benefits. The amendments in this ASU are effective for fiscal years beginning after December 15, 2019, and interim periods within those fiscal years, and early adoption is permitted. Entities must adopt the amendments on changes in unrealized gains and losses for Level 3 fair value measurements, the range and weighted average of significant unobservable inputs used to develop Level 3 fair value measurements, and the narrative description of measurement uncertainty prospectively, and all other amendments should be applied retrospectively to all periods presented. The adoption of ASU 2018-13 is currently not expected to have a material effect on our consolidated financial statements, but may require enhanced footnote disclosures.

Revenue Recognition

Revenue Recognition	6 Months Ended
	Jun. 30, 2019
Revenue from Contract with Customer [Abstract]
Revenue Recognition	Note 2. Revenue Recognition We record revenue in accordance with Financial Accounting Standards Board Codification (“FASC”) Topic 606, Revenue from Contracts with Customers . The core principle of FASC Topic 606 is that an entity should recognize revenue for the transfer of goods or services equal to the amount of consideration that it expects to be entitled to receive for those goods or services. Once we have delivered the volume of commodity to the delivery point and the customer takes delivery and possession, we are entitled to payment and we invoice the customer for such delivered production. Payment under most oil and CO 2 contracts is made within a month following product delivery and for natural gas and NGL contracts is generally made within two months following delivery. Timing of revenue recognition may differ from the timing of invoicing to customers; however, as the right to consideration after delivery is unconditional based on only the passage of time before payment of the consideration is due, upon delivery we record a receivable in “Accrued production receivable” in our Unaudited Condensed Consolidated Balance Sheets, which was $135.7 million and $125.8 million as of June 30, 2019 and December 31, 2018 , respectively. The Company enters into purchase transactions with third parties and separate sale transactions with third parties in the Gulf Coast region. Revenues and expenses from these transactions are presented on a gross basis, as we act as a principal in the transaction by assuming control of the commodities purchased and the responsibility to deliver the commodities sold. Revenue is recognized when control transfers to the purchaser at the delivery point based on the price received from the purchaser. Disaggregation of Revenue The following table summarizes our revenues by product type for the three and six months ended June 30, 2019 and 2018 : Three Months Ended Six Months Ended June 30, June 30, In thousands 2019 2018 2019 2018 Oil sales $ 328,571 $ 373,286 $ 620,536 $ 710,692 Natural gas sales 1,850 2,279 4,462 4,894 CO 2 sales and transportation fees 7,986 6,715 16,556 14,267 Purchased oil sales 2,591 346 2,806 1,403 Total revenues $ 340,998 $ 382,626 $ 644,360 $ 731,256

Leases

Leases	6 Months Ended
	Jun. 30, 2019
Leases [Abstract]
Leases	Note 3. Leases We evaluate contracts for leasing arrangements at inception. We lease office space, equipment, and vehicles that have non-cancelable lease terms. Leases with a term of 12 months or less are not recorded on our balance sheet. The table below reflects our operating lease assets and liabilities, which primarily consists of our office leases, and finance lease assets and liabilities: June 30, In thousands 2019 Operating leases Operating lease right-of-use assets $ 36,421 Operating lease liabilities - current $ 6,739 Operating lease liabilities - long-term 45,391 Total operating lease liabilities $ 52,130 Finance leases Other property and equipment $ 1,736 Accumulated depreciation (1,465 ) Other property and equipment, net $ 271 Current maturities of long-term debt $ 233 Long-term debt, net of current portion 59 Total finance lease liabilities $ 292 The majority of our leases contain renewal options, typically exercisable at our sole discretion. We record right-of-use assets and liabilities based on the present value of lease payments over the initial lease term, unless the option to extend the lease is reasonably certain, and utilize our incremental borrowing rate based on information available at the lease commencement date. The following weighted average remaining lease terms and discount rates related to our outstanding leases: June 30, 2019 Weighted Average Remaining Lease Term Operating leases 6.2 years Finance leases 1.3 years Weighted Average Discount Rate Operating leases 6.8 % Finance leases 2.3 % Lease costs for operating leases or leases with a term of 12 months or less are recognized on a straight-line basis over the lease term. For finance leases, interest on the lease liability and the amortization of the right-of-use asset are recognized separately, with the depreciable life reflective of the expected lease term. We have subleased part of the office space included in our operating leases for which we receive rental payments. The following table summarizes the components of lease costs and sublease income: Three Months Ended Six Months Ended In thousands Income Statement Presentation June 30, 2019 June 30, 2019 Operating lease cost General and administrative expenses $ 2,412 $ 4,827 Finance lease cost Amortization of right-of-use assets Depletion, depreciation, and amortization $ 264 $ 1,134 Interest on lease liabilities Interest expense 8 38 Total finance lease cost $ 272 $ 1,172 Sublease income General and administrative expenses $ 1,331 $ 2,367 Our statement of cash flows included the following activity related to our operating and finance leases: Six Months Ended In thousands June 30, 2019 Cash paid for amounts included in the measurement of lease liabilities Operating cash flows from operating leases $ 5,854 Operating cash flows from interest on finance leases 38 Financing cash flows from finance leases 1,217 Right-of-use assets obtained in exchange for lease obligations Operating leases 294 Finance leases — The following table summarizes by year the maturities of our lease liabilities as of June 30, 2019 : Operating Finance In thousands Leases Leases 2019 $ 5,063 $ 118 2020 9,874 178 2021 10,042 — 2022 10,259 — 2023 10,300 — Thereafter 18,537 — Total minimum lease payments 64,075 296 Less: Amount representing interest (11,945 ) (4 ) Present value of minimum lease payments $ 52,130 $ 292 The following table summarizes by year the remaining non-cancelable future payments under our leases, as accounted for under previous accounting guidance under FASC Topic 840, Leases , as of December 31, 2018: Operating In thousands Leases 2019 $ 10,690 2020 9,776 2021 10,007 2022 10,223 2023 10,262 Thereafter 18,169 Total minimum lease payments $ 69,127

Long-Term Debt

Long-Term Debt	6 Months Ended
	Jun. 30, 2019
Debt Disclosure [Abstract]
Long-Term Debt	Note 4. Long-Term Debt The table below reflects long-term debt and capital lease obligations outstanding as of the dates indicated: June 30, December 31, In thousands 2019 2018 Senior Secured Bank Credit Agreement $ 80,000 $ — 9% Senior Secured Second Lien Notes due 2021 614,919 614,919 9¼% Senior Secured Second Lien Notes due 2022 455,668 455,668 7¾% Senior Secured Second Lien Notes due 2024 528,026 — 7½% Senior Secured Second Lien Notes due 2024 24,638 450,000 6⅜% Convertible Senior Notes due 2024 245,548 — 6⅜% Senior Subordinated Notes due 2021 51,304 203,545 5½% Senior Subordinated Notes due 2022 94,784 314,662 4⅝% Senior Subordinated Notes due 2023 211,695 307,978 Pipeline financings 174,018 180,073 Capital lease obligations 292 5,362 Total debt principal balance 2,480,892 2,532,207 Debt discount (1) (109,072 ) — Future interest payable (2) 207,659 250,218 Debt issuance costs (11,523 ) (13,089 ) Total debt, net of debt issuance costs and discount 2,567,956 2,769,336 Less: current maturities of long-term debt (3) (101,829 ) (105,125 ) Long-term debt and capital lease obligations $ 2,466,127 $ 2,664,211 (1) Consists of discounts related to the issuance during June 2019 of our new 7¾% Senior Secured Second Lien Notes due 2024 (the “7¾% Senior Secured Notes”) and new 6⅜% Convertible Senior Notes due 2024 (the “2024 Convertible Senior Notes”) of $29.4 million and $79.6 million , respectively (see 2019 Note Exchanges below) as of June 30, 2019 . (2) Future interest payable represents most of the interest due over the terms of our 9% Senior Secured Second Lien Notes due 2021 (the “2021 Senior Secured Notes”) and 9¼% Senior Secured Second Lien Notes due 2022 (the “2022 Senior Secured Notes”) and has been accounted for as debt in accordance with FASC 470-60, Troubled Debt Restructuring by Debtors . (3) Our current maturities of long-term debt as of June 30, 2019 include $85.7 million of future interest payable related to the 2021 Senior Secured Notes and 2022 Senior Secured Notes that is due within the next twelve months. The ultimate parent company in our corporate structure, Denbury Resources Inc. (“DRI”), is the sole issuer of all of our outstanding senior secured, convertible senior, and senior subordinated notes. DRI has no independent assets or operations. Each of the subsidiary guarantors of such notes is 100% owned, directly or indirectly, by DRI, and the guarantees of the notes are full and unconditional and joint and several; any subsidiaries of DRI that are not subsidiary guarantors of such notes are minor subsidiaries. Senior Secured Bank Credit Facility In December 2014, we entered into an Amended and Restated Credit Agreement with JPMorgan Chase Bank, N.A., as administrative agent, and other lenders party thereto (as amended, the “Bank Credit Agreement”), which has been amended periodically since that time. The Bank Credit Agreement is a senior secured revolving credit facility with a maturity date of December 9, 2021, provided that the maturity date may occur earlier (between February 2021 and August 2021) if the 2021 Senior Secured Notes due in May 2021 or 6⅜% Senior Subordinated Notes due in August 2021, respectively, are not repaid or refinanced by each of their respective maturity dates. As part of our spring 2019 semiannual redetermination, the borrowing base and lender commitments for our Bank Credit Agreement were reaffirmed at $615 million , with the next such redetermination being scheduled for November 2019. If our outstanding debt under the Bank Credit Agreement were to ever exceed the borrowing base, we would be required to repay the excess amount over a period not to exceed six months. The weighted average interest rate on borrowings under the Bank Credit Agreement was 5.1% as of June 30, 2019. We incur a commitment fee of 0.50% on the undrawn portion of the aggregate lender commitments under the Bank Credit Agreement. The Bank Credit Agreement contains certain financial performance covenants through the maturity of the facility, including the following: • A Consolidated Total Debt to Consolidated EBITDAX covenant, with such ratio not to exceed 5.25 to 1.0 through December 31, 2020, and 4.50 to 1.0 thereafter; • A consolidated senior secured debt to consolidated EBITDAX covenant, with such ratio not to exceed 2.5 to 1.0. Only debt under our Bank Credit Agreement is considered consolidated senior secured debt for purposes of this ratio; • A minimum permitted ratio of consolidated EBITDAX to consolidated interest charges of 1.25 to 1.0; and • A requirement to maintain a current ratio of 1.0 to 1.0. As of June 30, 2019 , we were in compliance with all debt covenants under the Bank Credit Agreement. The above description of our Bank Credit Agreement and defined terms are contained in the Bank Credit Agreement and the amendments thereto. 2019 Note Exchanges During June 2019, we closed a series of debt exchanges to extend the maturities of our outstanding long-term debt and reduce our debt principal. As part of these transactions, we exchanged a total of $468.4 million aggregate principal amount of our then existing senior subordinated notes for $102.6 million aggregate principal amount of new 7¾% Senior Secured Notes, $245.5 million aggregate principal amount of new 2024 Convertible Senior Notes and $120.0 million of cash. The exchanged subordinated notes consisted of $152.2 million aggregate principal amount of our 6⅜% Senior Subordinated Notes due 2021, $219.9 million aggregate principal amount of our 5½% Senior Subordinated Notes due 2022 and $96.3 million aggregate principal amount of our 4⅝% Senior Subordinated Notes due 2023. In addition, we also exchanged $425.4 million of 7½% Senior Secured Second Lien Notes due 2024 (the “7½% Senior Secured Notes”) for $425.4 million aggregate principal amount of 7¾% Senior Secured Notes. In July 2019, we closed transactions to exchange an additional $4.0 million aggregate principal amount of 7½% Senior Secured Notes for $3.8 million aggregate principal amount of 7¾% Senior Secured Notes. In accordance with FASC 470-50, Modifications and Extinguishments , the June 2019 exchange of our existing senior subordinated notes was accounted for as a debt extinguishment. Therefore, our new 7¾% Senior Secured Notes and new 2024 Convertible Senior Notes were recorded on our balance sheet at fair market value based upon initial trading prices following their issuance, resulting in a discount to their principal amount of $22.6 million and $79.9 million , respectively. These debt discounts will be amortized as interest expense over the terms of these notes. As a result, we recognized a noncash gain on debt extinguishment, net of transaction costs, totaling $100.3 million for the three and six months ended June 30, 2019, in our Unaudited Condensed Consolidated Statements of Operations. Separately, the exchange of our existing senior secured second lien notes was accounted for as a modification of those notes. Therefore, no gain or loss was recognized, and previously deferred debt issuance costs of $6.9 million were treated as a discount to the principal amount of the new 7¾% Senior Secured Notes, which discount will be amortized as interest expense over the term of these notes. 7¾% Senior Secured Second Lien Notes due 2024 As part of the notes exchanges discussed above, in June 2019 we issued $528.0 million of 7¾% Senior Secured Notes in connection with exchanges with certain holders of the Company’s outstanding senior subordinated notes and existing 7½% Senior Secured Notes (see 2019 Note Exchanges above). The 7¾% Senior Secured Notes, which carry a stated interest rate of 7.75% per annum, were recorded at approximately 94% of their principal amount in accordance with FASC 470-50, Modifications and Extinguishments , which equates to an effective yield to maturity of approximately 9.39% . Interest on the 7¾% Senior Secured Notes is payable semiannually in arrears on February 15 and August 15 of each year, and mature on February 15, 2024. We may redeem the 7¾% Senior Secured Notes in whole or in part at our option beginning August 15, 2020, at a redemption price of 103.875% of the principal amount, and at declining redemption prices thereafter, as specified in the indenture governing the 7¾% Senior Secured Notes. Prior to August 15, 2020, we may at our option redeem up to an aggregate of 35% of the principal amount of the 7¾% Senior Secured Notes at a price of 107.75% of par with the proceeds of certain equity offerings. In addition, at any time prior to August 15, 2020, we may redeem the 7¾% Senior Secured Notes in whole or in part at a price equal to 100% of the principal amount plus a “make-whole” premium and accrued and unpaid interest. The 7¾% Senior Secured Notes are not subject to any sinking fund requirements. The 7¾% Senior Secured Notes are guaranteed jointly and severally by our subsidiaries representing substantially all of our assets, operations and income and are secured by second-priority liens on substantially all of the assets that secure the Bank Credit Agreement, which second-priority liens are contractually subordinated to liens that secure our Bank Credit Agreement and any future additional priority lien debt. 6⅜% Convertible Senior Notes due 2024 As part of the notes exchanges discussed above, in June 2019 we issued $245.5 million of 2024 Convertible Senior Notes in connection with exchanges with certain holders of the Company’s existing senior subordinated notes (see 2019 Note Exchanges above). The 2024 Convertible Senior Notes, which carry a stated interest rate of 6.375% per annum, were recorded at approximately 67% of their principal amount in accordance with FASC 470-50, Modifications and Extinguishments , which equates to an effective yield to maturity of approximately 15.31% . Interest on the 2024 Convertible Senior Notes is payable semiannually in arrears on June 30 and December 30 of each year, beginning in December 2019, and mature on December 31, 2024. We do not have the right to redeem the 2024 Convertible Senior Notes prior to their maturity. The 2024 Convertible Senior Notes are convertible into shares of our common stock at any time, at the option of the holders, at a rate of 370 shares of common stock per $1,000 principal amount of 2024 Convertible Senior Notes, which is equivalent to up to approximately 90.9 million shares of the Company’s common stock, subject to customary adjustments to the conversion rate and threshold price with respect to, among other things, stock dividends and distributions, mergers and reclassifications. The 2024 Convertible Senior Notes will be automatically converted into shares of common stock at this rate if the volume weighted average trading price of the Company’s common stock equals or exceeds the threshold price, which initially is $2.43 per share, for 10 trading days in any period of 15 consecutive trading days, subject to satisfaction of certain other conditions. Additionally, the Company may, based on a determination of its Board of Directors that such changes are in the best interests of the Company, and subject to certain limitations, increase the conversion rate. Any such conversion rate increase would cause a proportional decrease in the threshold price for mandatory conversions, and thereby would enable the Company to require a mandatory conversion into common stock at a lower price than the initial or then-prevailing threshold price.

Commodity Derivative Contracts

Commodity Derivative Contracts	6 Months Ended
	Jun. 30, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Commodity Derivative Contracts	Note 5. Commodity Derivative Contracts We do not apply hedge accounting treatment to our oil and natural gas derivative contracts; therefore, the changes in the fair values of these instruments are recognized in income in the period of change. These fair value changes, along with the settlements of expired contracts, are shown under “ Commodity derivatives expense (income) ” in our Unaudited Condensed Consolidated Statements of Operations. Historically, we have entered into various oil and natural gas derivative contracts to provide an economic hedge of our exposure to commodity price risk associated with anticipated future oil and natural gas production and to provide more certainty to our future cash flows. We do not hold or issue derivative financial instruments for trading purposes. Generally, these contracts have consisted of various combinations of price floors, collars, three-way collars, fixed-price swaps, fixed-price swaps enhanced with a sold put, and basis swaps. The production that we hedge has varied from year to year depending on our levels of debt, financial strength and expectation of future commodity prices. We manage and control market and counterparty credit risk through established internal control procedures that are reviewed on an ongoing basis. We attempt to minimize credit risk exposure to counterparties through formal credit policies, monitoring procedures and diversification, and all of our commodity derivative contracts are with parties that are lenders under our Bank Credit Agreement (or affiliates of such lenders). As of June 30, 2019 , all of our outstanding derivative contracts were subject to enforceable master netting arrangements whereby payables on those contracts can be offset against receivables from separate derivative contracts with the same counterparty. It is our policy to classify derivative assets and liabilities on a gross basis on our balance sheets, even if the contracts are subject to enforceable master netting arrangements. The following table summarizes our commodity derivative contracts as of June 30, 2019 , none of which are classified as hedging instruments in accordance with the FASC Derivatives and Hedging topic: Months Index Price Volume (Barrels per day) Contract Prices ($/Bbl) Range (1) Weighted Average Price Swap Sold Put Floor Ceiling Oil Contracts: 2019 Fixed-Price Swaps July – Dec Argus LLS 13,000 $ 60.00 – 74.90 $ 64.69 $ — $ — $ — 2019 Three-Way Collars (2) July – Dec NYMEX 22,000 $ 55.00 – 75.45 $ — $ 48.55 $ 56.55 $ 69.17 July – Dec Argus LLS 5,500 62.00 – 86.00 — 54.73 63.09 79.93 2020 Fixed-Price Swaps Jan – Dec NYMEX 2,000 $ 60.00 – 61.00 $ 60.59 $ — $ — $ — Jan – Dec Argus LLS 4,000 60.72 – 64.26 62.41 — — — 2020 Three-Way Collars (2) Jan – June NYMEX 12,000 $ 55.00 – 82.65 $ — $ 48.89 $ 58.49 $ 65.57 Jan – June Argus LLS 4,500 62.50 – 87.10 — 53.89 63.89 72.55 July – Dec NYMEX 10,000 55.00 – 82.65 — 49.05 58.58 65.81 July – Dec Argus LLS 2,500 64.00 – 87.10 — 54.40 64.40 76.59 (1) Ranges presented for fixed-price swaps represent the lowest and highest fixed prices of all open contracts for the period presented. For three-way collars, ranges represent the lowest floor price and highest ceiling price for all open contracts for the period presented. (2) A three-way collar is a costless collar contract combined with a sold put feature (at a lower price) with the same counterparty. The value received for the sold put is used to enhance the contracted floor and ceiling price of the related collar. At the contract settlement date, (1) if the index price is higher than the ceiling price, we pay the counterparty the difference between the index price and ceiling price for the contracted volumes, (2) if the index price is between the floor and ceiling price, no settlements occur, (3) if the index price is lower than the floor price but at or above the sold put price, the counterparty pays us the difference between the index price and the floor price for the contracted volumes and (4) if the index price is lower than the sold put price, the counterparty pays us the difference between the floor price and the sold put price for the contracted volumes.

Fair Value Measurements

Fair Value Measurements	6 Months Ended
	Jun. 30, 2019
Fair Value Disclosures [Abstract]
Fair Value Measurements	Note 6. Fair Value Measurements The FASC Fair Value Measurement topic defines fair value as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date (often referred to as the “exit price”). We utilize market data or assumptions that market participants would use in pricing the asset or liability, including assumptions about risk and the risks inherent in the inputs to the valuation technique. These inputs can be readily observable, market corroborated or generally unobservable. We primarily apply the income approach for recurring fair value measurements and endeavor to utilize the best available information. Accordingly, we utilize valuation techniques that maximize the use of observable inputs and minimize the use of unobservable inputs. We are able to classify fair value balances based on the observability of those inputs. The FASC establishes a fair value hierarchy that prioritizes the inputs used to measure fair value. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1 measurement) and the lowest priority to unobservable inputs (Level 3 measurement). The three levels of the fair value hierarchy are as follows: • Level 1 – Quoted prices in active markets for identical assets or liabilities as of the reporting date. • Level 2 – Pricing inputs are other than quoted prices in active markets included in Level 1, which are either directly or indirectly observable as of the reported date. Level 2 includes those financial instruments that are valued using models or other valuation methodologies. Instruments in this category include non-exchange-traded oil derivatives that are based on NYMEX pricing and fixed-price swaps that are based on regional pricing other than NYMEX (e.g., Light Louisiana Sweet). Our costless collars and the sold put features of our three-way collars are valued using the Black-Scholes model, an industry standard option valuation model that takes into account inputs such as contractual prices for the underlying instruments, maturity, quoted forward prices for commodities, interest rates, volatility factors and credit worthiness, as well as other relevant economic measures. Substantially all of these assumptions are observable in the marketplace throughout the full term of the instrument, can be derived from observable data or are supported by observable levels at which transactions are executed in the marketplace. • Level 3 – Pricing inputs include significant inputs that are generally less observable. These inputs may be used with internally developed methodologies that result in management’s best estimate of fair value. As of June 30, 2019 , instruments in this category include non-exchange-traded three-way collars that are based on regional pricing other than NYMEX (e.g., Light Louisiana Sweet). The valuation models utilized for costless collars and three-way collars are consistent with the methodologies described above; however, the implied volatilities utilized in the valuation of Level 3 instruments are developed using a benchmark, which is considered a significant unobservable input. An increase or decrease of 100 basis points in the implied volatility inputs utilized in our fair value measurement would result in a change of approximately $150 thousand in the fair value of these instruments as of June 30, 2019 . We adjust the valuations from the valuation model for nonperformance risk, using our estimate of the counterparty’s credit quality for asset positions and our credit quality for liability positions. We use multiple sources of third-party credit data in determining counterparty nonperformance risk, including credit default swaps. The following table sets forth, by level within the fair value hierarchy, our financial assets and liabilities that were accounted for at fair value on a recurring basis as of the periods indicated: Fair Value Measurements Using: In thousands Quoted Prices in Active Markets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Total June 30, 2019 Assets Oil derivative contracts – current $ — $ 19,927 $ 4,520 $ 24,447 Oil derivative contracts – long-term — 7,935 1,553 9,488 Total Assets $ — $ 27,862 $ 6,073 $ 33,935 Liabilities Oil derivative contracts – current $ — $ (1,912 ) $ — $ (1,912 ) Oil derivative contracts – long-term — (22 ) — (22 ) Total Liabilities $ — $ (1,934 ) $ — $ (1,934 ) December 31, 2018 Assets Oil derivative contracts – current $ — $ 81,621 $ 11,459 $ 93,080 Oil derivative contracts – long-term — 2,030 2,165 4,195 Total Assets $ — $ 83,651 $ 13,624 $ 97,275 Since we do not apply hedge accounting for our commodity derivative contracts, any gains and losses on our assets and liabilities are included in “ Commodity derivatives expense (income) ” in the accompanying Unaudited Condensed Consolidated Statements of Operations. Level 3 Fair Value Measurements The following table summarizes the changes in the fair value of our Level 3 assets and liabilities for the three and six months ended June 30, 2019 and 2018 : Three Months Ended Six Months Ended June 30, June 30, In thousands 2019 2018 2019 2018 Fair value of Level 3 instruments, beginning of period $ 3,686 $ — $ 13,624 $ — Fair value gains (losses) on commodity derivatives 2,720 (1,168 ) (6,360 ) (1,168 ) Receipts on settlements of commodity derivatives (333 ) — (1,191 ) — Fair value of Level 3 instruments, end of period $ 6,073 $ (1,168 ) $ 6,073 $ (1,168 ) The amount of total gains (losses) for the period included in earnings attributable to the change in unrealized gains (losses) relating to assets or liabilities still held at the reporting date $ 2,387 $ (1,168 ) $ (1,240 ) $ (1,168 ) We utilize an income approach to value our Level 3 three-way collars. We obtain and ensure the appropriateness of the significant inputs to the calculation, including contractual prices for the underlying instruments, maturity, forward prices for commodities, interest rates, volatility factors and credit worthiness, and the fair value estimate is prepared and reviewed on a quarterly basis. The following table details fair value inputs related to implied volatilities utilized in the valuation of our Level 3 oil derivative contracts: Fair Value at Valuation Technique Unobservable Input Volatility Range Oil derivative contracts $ 6,073 Discounted cash flow / Black-Scholes Volatility of Light Louisiana Sweet for settlement periods beginning after June 30, 2019 20.4% – 34.1% Other Fair Value Measurements The carrying value of our loans under our Bank Credit Agreement approximate fair value, as they are subject to short-term floating interest rates that approximate the rates available to us for those periods. We use a market approach to determine the fair value of our fixed-rate long-term debt using observable market data. The fair values of our senior secured second lien notes, convertible senior notes, and senior subordinated notes are based on quoted market prices, which are considered Level 1 measurements under the fair value hierarchy. The estimated fair value of the principal amount of our debt as of June 30, 2019 and December 31, 2018 , excluding pipeline financing and capital lease obligations, was $1,935.6 million and $1,886.1 million , respectively. We have other financial instruments consisting primarily of cash, cash equivalents, U.S. Treasury Notes, short-term receivables and payables that approximate fair value due to the nature of the instrument and the relatively short maturities.

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Jun. 30, 2019
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Note 7. Commitments and Contingencies Litigation We are involved in various lawsuits, claims and regulatory proceedings incidental to our businesses. We are also subject to audits for various taxes (income, sales and use, and severance) in the various states in which we operate, and from time to time receive assessments for potential taxes that we may owe. While we currently believe that the ultimate outcome of these proceedings, individually and in the aggregate, will not have a material adverse effect on our financial position, results of operations or cash flows, litigation is subject to inherent uncertainties. We accrue for losses from litigation and claims if we determine that a loss is probable and the amount can be reasonably estimated. Riley Ridge Helium Supply Contract Claim As part of our 2010 and 2011 acquisitions of the Riley Ridge Unit and associated gas processing facility that was under construction, the Company assumed a 20 -year helium supply contract under which we agreed to supply the helium separated from the full well stream by operation of the gas processing facility to a third-party purchaser, APMTG Helium, LLC (“APMTG”). The helium supply contract provides for the delivery of a minimum contracted quantity of helium, with liquidated damages payable if specified quantities of helium are not supplied in accordance with the terms of the contract. The liquidated damages are specified in the contract at up to $8.0 million per contract year and are capped at an aggregate of $46.0 million over the term of the contract. As the gas processing facility has been shut-in since mid-2014 due to significant technical issues, we have not been able to supply helium under the helium supply contract. In a case filed in November 2014 in the Ninth Judicial District Court of Sublette County, Wyoming, APMTG claimed multiple years of liquidated damages for non-delivery of volumes of helium specified under the helium supply contract. The Company claimed that its contractual obligations were excused by virtue of events that fall within the force majeure provisions in the helium supply contract. On March 11, 2019, the trial court entered a final judgment that a force majeure condition did exist, but the Company’s performance was excused by the force majeure provisions of the contract for only a 35-day period in 2014, and as a result the Company should pay APMTG liquidated damages and interest thereon for those time periods from contract commencement to the close of evidence (November 29, 2017) when the Company’s performance was not excused as provided in the contract. The Company has filed a notice of appeal of the trial court’s ruling to the Wyoming Supreme Court, the results of which cannot be predicted at this time. The Company’s position continues to be that its contractual obligations have been and continue to be excused by events that fall within the force majeure provisions in the helium supply contract. The Company intends to continue to vigorously defend its position and pursue all of its rights. Absent reversal of the trial court’s ruling on appeal, the Company anticipates total liquidated damages would equal the $46.0 million aggregate cap under the helium supply contract (including $14.2 million of liquidated damages for the contract years ending July 31, 2018 and July 31, 2019) plus $4.2 million of associated costs (through June 30, 2019), for a total of $50.2 million , included in “Other liabilities” in our Unaudited Condensed Consolidated Balance Sheets as of June 30, 2019.

Subsequent Event

Subsequent Event	6 Months Ended
	Jun. 30, 2019
Subsequent Events [Abstract]
Subsequent Event	Note 8. Subsequent Event On July 17, 2019, the Compensation Committee of our Board of Directors made our annual grant of long-term incentive awards, consisting of 9,115,746 shares of restricted stock and 3,759,051 restricted stock units which are to be settled solely in cash, to certain employees under our 2004 Omnibus Stock and Incentive Plan. The closing stock price of Denbury’s common stock on July 17, 2019 was $1.17 per share; however, the Compensation Committee utilized a stock price floor of $2.25 per share in determining the total number of shares of restricted stock granted. In addition, the amount of cash for which the restricted stock units can be settled is capped at no more than two times the grant date value of the restricted stock units. The awards generally vest one-third per year over a three -year period.

Basis of Presentation (Policies

Basis of Presentation (Policies)	6 Months Ended
	Jun. 30, 2019
Accounting Policies [Abstract]
Organization and Nature of Operations	Organization and Nature of Operations Denbury Resources Inc., a Delaware corporation, is an independent oil and natural gas company with operations focused in two key operating areas: the Gulf Coast and Rocky Mountain regions. Our goal is to increase the value of our properties through a combination of exploitation, drilling and proven engineering extraction practices, with the most significant emphasis relating to CO 2 enhanced oil recovery operations.
Interim Financial Statements - Basis of Accounting, Policy	Interim Financial Statements The accompanying unaudited condensed consolidated financial statements of Denbury Resources Inc. and its subsidiaries have been prepared in accordance with the rules and regulations of the Securities and Exchange Commission (“SEC”) and do not include all of the information and footnotes required by accounting principles generally accepted in the United States for complete financial statements. These financial statements and the notes thereto should be read in conjunction with our Annual Report on Form 10-K for the year ended December 31, 2018 (the “Form 10-K”). Unless indicated otherwise or the context requires, the terms “we,” “our,” “us,” “Company” or “Denbury,” refer to Denbury Resources Inc. and its subsidiaries.
Interim Financial Statements - Use of Estimates	Accounting measurements at interim dates inherently involve greater reliance on estimates than at year end, and the results of operations for the interim periods shown in this report are not necessarily indicative of results to be expected for the year. In management’s opinion, the accompanying unaudited condensed consolidated financial statements include all adjustments of a normal recurring nature necessary for a fair statement of our consolidated financial position as of June 30, 2019 , our consolidated results of operations for the three and six months ended June 30, 2019 and 2018 , our consolidated cash flows for the six months ended June 30, 2019 and 2018 , and our consolidated statements of changes in stockholders’ equity for the three and six months ended June 30, 2019 and 2018 .
Reclassifications	Reclassifications Certain prior period amounts have been reclassified to conform to the current year presentation. On the Unaudited Condensed Consolidated Statements of Operations for the three and six months ended June 30, 2018, “Purchased oil sales” is a new line item and includes sales related to purchases of oil from third-parties, which were reclassified from “Other income,” “Purchased oil expenses” is a new line item and includes expenses related to purchases of oil from third-parties, which were reclassified from “Marketing and plant operating expenses” used in prior reports, and “Transportation and marketing expenses” is a new line item, previously captioned “Marketing and plant operating expenses,” but adjusted to exclude both expenses related to plant operating expenses, which were reclassified to “Other expenses,” and also purchases of oil from third-parties. Such reclassifications had no impact on our reported total revenues, expenses, net income , current assets, total assets, current liabilities, total liabilities or stockholders’ equity.
Cash, Cash Equivalents, and Restricted Cash	Cash, Cash Equivalents, and Restricted Cash The following table provides a reconciliation of cash, cash equivalents, and restricted cash as reported within the Unaudited Condensed Consolidated Balance Sheets to “Cash, cash equivalents, and restricted cash at end of period” as reported within the Unaudited Condensed Consolidated Statements of Cash Flows: In thousands June 30, 2019 December 31, 2018 Cash and cash equivalents $ 341 $ 38,560 Restricted cash included in other assets 22,198 16,389 Total cash, cash equivalents, and restricted cash shown in the Unaudited Condensed Consolidated Statements of Cash Flows $ 22,539 $ 54,949 Amounts included in restricted cash included in “Other assets” in the accompanying Unaudited Condensed Consolidated Balance Sheets represent escrow accounts that are legally restricted for certain of our asset retirement obligations.
Net Income per Common Share	Net Income per Common Share Basic net income per common share is computed by dividing the net income attributable to common stockholders by the weighted average number of shares of common stock outstanding during the period. Diluted net income per common share is calculated in the same manner, but includes the impact of potentially dilutive securities. Potentially dilutive securities consist of nonvested restricted stock, nonvested performance-based equity awards, and shares into which our convertible senior notes are convertible . The following table sets forth the reconciliations of net income and weighted average shares used for purposes of calculating the basic and diluted net income per common share for the periods indicated: Three Months Ended Six Months Ended June 30, June 30, In thousands 2019 2018 2019 2018 Numerator Net income – basic $ 146,692 $ 30,222 $ 121,018 $ 69,800 Effect of potentially dilutive securities Interest on convertible senior notes including amortization of discount, net of tax 548 130 548 539 Net income – diluted $ 147,240 $ 30,352 $ 121,566 $ 70,339 Denominator Weighted average common shares outstanding – basic 452,612 433,467 452,169 413,217 Effect of potentially dilutive securities Restricted stock and performance-based equity awards 2,835 8,586 3,301 6,877 Convertible senior notes (1) 11,980 15,112 5,990 34,372 Weighted average common shares outstanding – diluted 467,427 457,165 461,460 454,466 (1) For the three and six months ended June 30, 2019, shares shown under “convertible senior notes” represent the prorated portion of the approximately 90.9 million shares of the Company’s common stock issuable upon full conversion of our convertible senior notes (see Note 4, Long-Term Debt – 2019 Note Exchanges ). Basic weighted average common shares exclude shares of nonvested restricted stock. As these restricted shares vest, they will be included in the shares outstanding used to calculate basic net income per common share (although time-vesting restricted stock is issued and outstanding upon grant). For purposes of calculating diluted weighted average common shares during the three and six months ended June 30, 2019 and 2018 , the nonvested restricted stock and performance-based equity awards are included in the computation using the treasury stock method, with the deemed proceeds equal to the average unrecognized compensation during the period, and for the shares underlying the convertible senior notes as if the convertible senior notes were converted at the beginning of the 2018 and 2019 periods. The following securities could potentially dilute earnings per share in the future, but were excluded from the computation of diluted net income per share, as their effect would have been antidilutive: Three Months Ended Six Months Ended June 30, June 30, In thousands 2019 2018 2019 2018 Stock appreciation rights 2,026 2,827 2,059 2,891 Restricted stock and performance-based equity awards 4,998 179 4,790 305
Recent Accounting Pronouncements	Recent Accounting Pronouncements Recently Adopted Leases. Effective January 1, 2019, we adopted Accounting Standards Update (“ASU”) 2016-02, Leases (“ASU 2016-02”), and ASU 2018-01, Leases (Topic 842) – Land Easement Practical Expedient for Transition to Topic 842 , using the modified retrospective method with an application date of January 1, 2019. ASU 2016-02 does not apply to mineral leases or leases that convey the right to explore for or use the land on which oil, natural gas, and similar natural resources are contained. We elected the practical expedients provided in the new ASUs that allow historical lease classification of existing leases, allow entities to recognize leases with terms of one year or less in their statement of operations, allow lease and non-lease components to be combined, and carry forward our accounting treatment for existing land easement agreements. The adoption of the new standards resulted in the recognition of $39.1 million of lease assets and $55.8 million of lease liabilities ( $16.7 million of which related to previously-existing lease obligations) as of January 1, 2019, in our Unaudited Condensed Consolidated Balance Sheets, but did not materially impact our results of operations and had no impact on our cash flows. The additional lease assets and liabilities recorded on our balance sheet primarily related to our operating leases for office space, as the accounting for our financing leases and pipeline financings was relatively unchanged. Not Yet Adopted Financial Instruments – Credit Losses. In June 2016, the FASB issued ASU 2016-13, Financial Instruments – Credit Losses (“ASU 2016-13”). ASU 2016-13 changes the impairment model for most financial assets and certain other instruments, including trade and other receivables, and requires the use of a new forward-looking expected loss model that will result in the earlier recognition of allowances for losses. The amendments in this ASU are effective for fiscal years beginning after December 15, 2019, and interim periods within those fiscal years, and early adoption is permitted. Entities must adopt the amendment using a modified retrospective approach to the first reporting period in which the guidance is effective. The adoption of ASU 2016-13 is currently not expected to have a material effect on our consolidated financial statements. Fair Value Measurement. In August 2018, the FASB issued ASU 2018-13, Fair Value Measurement (Topic 820) – Disclosure Framework – Changes to the Disclosure Requirements for Fair Value Measurements (“ASU 2018-13”). ASU 2018-13 adds, modifies, or removes certain disclosure requirements for recurring and nonrecurring fair value measurements based on the FASB’s consideration of costs and benefits. The amendments in this ASU are effective for fiscal years beginning after December 15, 2019, and interim periods within those fiscal years, and early adoption is permitted. Entities must adopt the amendments on changes in unrealized gains and losses for Level 3 fair value measurements, the range and weighted average of significant unobservable inputs used to develop Level 3 fair value measurements, and the narrative description of measurement uncertainty prospectively, and all other amendments should be applied retrospectively to all periods presented. The adoption of ASU 2018-13 is currently not expected to have a material effect on our consolidated financial statements, but may require enhanced footnote disclosures.
Revenue Recognition	We record revenue in accordance with Financial Accounting Standards Board Codification (“FASC”) Topic 606, Revenue from Contracts with Customers . The core principle of FASC Topic 606 is that an entity should recognize revenue for the transfer of goods or services equal to the amount of consideration that it expects to be entitled to receive for those goods or services. Once we have delivered the volume of commodity to the delivery point and the customer takes delivery and possession, we are entitled to payment and we invoice the customer for such delivered production. Payment under most oil and CO 2 contracts is made within a month following product delivery and for natural gas and NGL contracts is generally made within two months following delivery. Timing of revenue recognition may differ from the timing of invoicing to customers; however, as the right to consideration after delivery is unconditional based on only the passage of time before payment of the consideration is due, upon delivery we record a receivable in “Accrued production receivable” in our Unaudited Condensed Consolidated Balance Sheets, which was $135.7 million and $125.8 million as of June 30, 2019 and December 31, 2018 , respectively. The Company enters into purchase transactions with third parties and separate sale transactions with third parties in the Gulf Coast region. Revenues and expenses from these transactions are presented on a gross basis, as we act as a principal in the transaction by assuming control of the commodities purchased and the responsibility to deliver the commodities sold. Revenue is recognized when control transfers to the purchaser at the delivery point based on the price received from the purchaser.
Leases	The majority of our leases contain renewal options, typically exercisable at our sole discretion. We record right-of-use assets and liabilities based on the present value of lease payments over the initial lease term, unless the option to extend the lease is
Commodity Derivative Contracts	We do not apply hedge accounting treatment to our oil and natural gas derivative contracts; therefore, the changes in the fair values of these instruments are recognized in income in the period of change. These fair value changes, along with the settlements of expired contracts, are shown under “ Commodity derivatives expense (income) ” in our Unaudited Condensed Consolidated Statements of Operations. Historically, we have entered into various oil and natural gas derivative contracts to provide an economic hedge of our exposure to commodity price risk associated with anticipated future oil and natural gas production and to provide more certainty to our future cash flows. We do not hold or issue derivative financial instruments for trading purposes. Generally, these contracts have consisted of various combinations of price floors, collars, three-way collars, fixed-price swaps, fixed-price swaps enhanced with a sold put, and basis swaps. The production that we hedge has varied from year to year depending on our levels of debt, financial strength and expectation of future commodity prices. We manage and control market and counterparty credit risk through established internal control procedures that are reviewed on an ongoing basis. We attempt to minimize credit risk exposure to counterparties through formal credit policies, monitoring procedures and diversification, and all of our commodity derivative contracts are with parties that are lenders under our Bank Credit Agreement (or affiliates of such lenders). As of June 30, 2019 , all of our outstanding derivative contracts were subject to enforceable master netting arrangements whereby payables on those contracts can be offset against receivables from separate derivative contracts with the same counterparty. It is our policy to classify derivative assets and liabilities on a gross basis on our balance sheets, even if the contracts are subject to enforceable master netting arrangements.
Fair Value Measurements	The FASC Fair Value Measurement topic defines fair value as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date (often referred to as the “exit price”). We utilize market data or assumptions that market participants would use in pricing the asset or liability, including assumptions about risk and the risks inherent in the inputs to the valuation technique. These inputs can be readily observable, market corroborated or generally unobservable. We primarily apply the income approach for recurring fair value measurements and endeavor to utilize the best available information. Accordingly, we utilize valuation techniques that maximize the use of observable inputs and minimize the use of unobservable inputs. We are able to classify fair value balances based on the observability of those inputs. The FASC establishes a fair value hierarchy that prioritizes the inputs used to measure fair value. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1 measurement) and the lowest priority to unobservable inputs (Level 3 measurement). The three levels of the fair value hierarchy are as follows: • Level 1 – Quoted prices in active markets for identical assets or liabilities as of the reporting date. • Level 2 – Pricing inputs are other than quoted prices in active markets included in Level 1, which are either directly or indirectly observable as of the reported date. Level 2 includes those financial instruments that are valued using models or other valuation methodologies. Instruments in this category include non-exchange-traded oil derivatives that are based on NYMEX pricing and fixed-price swaps that are based on regional pricing other than NYMEX (e.g., Light Louisiana Sweet). Our costless collars and the sold put features of our three-way collars are valued using the Black-Scholes model, an industry standard option valuation model that takes into account inputs such as contractual prices for the underlying instruments, maturity, quoted forward prices for commodities, interest rates, volatility factors and credit worthiness, as well as other relevant economic measures. Substantially all of these assumptions are observable in the marketplace throughout the full term of the instrument, can be derived from observable data or are supported by observable levels at which transactions are executed in the marketplace. • Level 3 – Pricing inputs include significant inputs that are generally less observable. These inputs may be used with internally developed methodologies that result in management’s best estimate of fair value. As of June 30, 2019 , instruments in this category include non-exchange-traded three-way collars that are based on regional pricing other than NYMEX (e.g., Light Louisiana Sweet). The valuation models utilized for costless collars and three-way collars are consistent with the methodologies described above; however, the implied volatilities utilized in the valuation of Level 3 instruments are developed using a benchmark, which is considered a significant unobservable input. An increase or decrease of 100 basis points in the implied volatility inputs utilized in our fair value measurement would result in a change of approximately $150 thousand in the fair value of these instruments as of June 30, 2019 . We adjust the valuations from the valuation model for nonperformance risk, using our estimate of the counterparty’s credit quality for asset positions and our credit quality for liability positions. We use multiple sources of third-party credit data in determining counterparty nonperformance risk, including credit default swaps.

Basis of Presentation (Tables)

Basis of Presentation (Tables)	6 Months Ended
	Jun. 30, 2019
Accounting Policies [Abstract]
Schedule of cash, cash equivalents, and restricted cash	The following table provides a reconciliation of cash, cash equivalents, and restricted cash as reported within the Unaudited Condensed Consolidated Balance Sheets to “Cash, cash equivalents, and restricted cash at end of period” as reported within the Unaudited Condensed Consolidated Statements of Cash Flows: In thousands June 30, 2019 December 31, 2018 Cash and cash equivalents $ 341 $ 38,560 Restricted cash included in other assets 22,198 16,389 Total cash, cash equivalents, and restricted cash shown in the Unaudited Condensed Consolidated Statements of Cash Flows $ 22,539 $ 54,949
Schedule of earnings per share, basic and diluted reconciliation	Three Months Ended Six Months Ended June 30, June 30, In thousands 2019 2018 2019 2018 Numerator Net income – basic $ 146,692 $ 30,222 $ 121,018 $ 69,800 Effect of potentially dilutive securities Interest on convertible senior notes including amortization of discount, net of tax 548 130 548 539 Net income – diluted $ 147,240 $ 30,352 $ 121,566 $ 70,339 Denominator Weighted average common shares outstanding – basic 452,612 433,467 452,169 413,217 Effect of potentially dilutive securities Restricted stock and performance-based equity awards 2,835 8,586 3,301 6,877 Convertible senior notes (1) 11,980 15,112 5,990 34,372 Weighted average common shares outstanding – diluted 467,427 457,165 461,460 454,466 (1) For the three and six months ended June 30, 2019, shares shown under “convertible senior notes” represent the prorated portion of the approximately 90.9 million shares of the Company’s common stock issuable upon full conversion of our convertible senior notes (see Note 4, Long-Term Debt – 2019 Note Exchanges ).
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share	The following securities could potentially dilute earnings per share in the future, but were excluded from the computation of diluted net income per share, as their effect would have been antidilutive: Three Months Ended Six Months Ended June 30, June 30, In thousands 2019 2018 2019 2018 Stock appreciation rights 2,026 2,827 2,059 2,891 Restricted stock and performance-based equity awards 4,998 179 4,790 305

Revenue Recognition (Tables)

Revenue Recognition (Tables)	6 Months Ended
	Jun. 30, 2019
Revenue from Contract with Customer [Abstract]
Disaggregation of Revenue	The following table summarizes our revenues by product type for the three and six months ended June 30, 2019 and 2018 : Three Months Ended Six Months Ended June 30, June 30, In thousands 2019 2018 2019 2018 Oil sales $ 328,571 $ 373,286 $ 620,536 $ 710,692 Natural gas sales 1,850 2,279 4,462 4,894 CO 2 sales and transportation fees 7,986 6,715 16,556 14,267 Purchased oil sales 2,591 346 2,806 1,403 Total revenues $ 340,998 $ 382,626 $ 644,360 $ 731,256

Leases (Tables)

Leases (Tables)	6 Months Ended
	Jun. 30, 2019
Leases [Abstract]
Schedule of Lease Assets and Liabilities	The table below reflects our operating lease assets and liabilities, which primarily consists of our office leases, and finance lease assets and liabilities: June 30, In thousands 2019 Operating leases Operating lease right-of-use assets $ 36,421 Operating lease liabilities - current $ 6,739 Operating lease liabilities - long-term 45,391 Total operating lease liabilities $ 52,130 Finance leases Other property and equipment $ 1,736 Accumulated depreciation (1,465 ) Other property and equipment, net $ 271 Current maturities of long-term debt $ 233 Long-term debt, net of current portion 59 Total finance lease liabilities $ 292
Schedule of Weighted Average Lease Terms and Discount Rates	The following weighted average remaining lease terms and discount rates related to our outstanding leases: June 30, 2019 Weighted Average Remaining Lease Term Operating leases 6.2 years Finance leases 1.3 years Weighted Average Discount Rate Operating leases 6.8 % Finance leases 2.3 %
Schedule of Lease Costs	The following table summarizes the components of lease costs and sublease income: Three Months Ended Six Months Ended In thousands Income Statement Presentation June 30, 2019 June 30, 2019 Operating lease cost General and administrative expenses $ 2,412 $ 4,827 Finance lease cost Amortization of right-of-use assets Depletion, depreciation, and amortization $ 264 $ 1,134 Interest on lease liabilities Interest expense 8 38 Total finance lease cost $ 272 $ 1,172 Sublease income General and administrative expenses $ 1,331 $ 2,367
Supplemental Cash Flow Information Related to Leases	Our statement of cash flows included the following activity related to our operating and finance leases: Six Months Ended In thousands June 30, 2019 Cash paid for amounts included in the measurement of lease liabilities Operating cash flows from operating leases $ 5,854 Operating cash flows from interest on finance leases 38 Financing cash flows from finance leases 1,217 Right-of-use assets obtained in exchange for lease obligations Operating leases 294 Finance leases —
Schedule of Maturities of Operating and Finance Lease Liabilities	The following table summarizes by year the maturities of our lease liabilities as of June 30, 2019 : Operating Finance In thousands Leases Leases 2019 $ 5,063 $ 118 2020 9,874 178 2021 10,042 — 2022 10,259 — 2023 10,300 — Thereafter 18,537 — Total minimum lease payments 64,075 296 Less: Amount representing interest (11,945 ) (4 ) Present value of minimum lease payments $ 52,130 $ 292
Schedule of operating long-term commitments which require future minimum lease payments	The following table summarizes by year the remaining non-cancelable future payments under our leases, as accounted for under previous accounting guidance under FASC Topic 840, Leases , as of December 31, 2018: Operating In thousands Leases 2019 $ 10,690 2020 9,776 2021 10,007 2022 10,223 2023 10,262 Thereafter 18,169 Total minimum lease payments $ 69,127

Long-Term Debt (Tables)

Long-Term Debt (Tables)	6 Months Ended
	Jun. 30, 2019
Debt Disclosure [Abstract]
Components of Long-Term Debt	The table below reflects long-term debt and capital lease obligations outstanding as of the dates indicated: June 30, December 31, In thousands 2019 2018 Senior Secured Bank Credit Agreement $ 80,000 $ — 9% Senior Secured Second Lien Notes due 2021 614,919 614,919 9¼% Senior Secured Second Lien Notes due 2022 455,668 455,668 7¾% Senior Secured Second Lien Notes due 2024 528,026 — 7½% Senior Secured Second Lien Notes due 2024 24,638 450,000 6⅜% Convertible Senior Notes due 2024 245,548 — 6⅜% Senior Subordinated Notes due 2021 51,304 203,545 5½% Senior Subordinated Notes due 2022 94,784 314,662 4⅝% Senior Subordinated Notes due 2023 211,695 307,978 Pipeline financings 174,018 180,073 Capital lease obligations 292 5,362 Total debt principal balance 2,480,892 2,532,207 Debt discount (1) (109,072 ) — Future interest payable (2) 207,659 250,218 Debt issuance costs (11,523 ) (13,089 ) Total debt, net of debt issuance costs and discount 2,567,956 2,769,336 Less: current maturities of long-term debt (3) (101,829 ) (105,125 ) Long-term debt and capital lease obligations $ 2,466,127 $ 2,664,211 (1) Consists of discounts related to the issuance during June 2019 of our new 7¾% Senior Secured Second Lien Notes due 2024 (the “7¾% Senior Secured Notes”) and new 6⅜% Convertible Senior Notes due 2024 (the “2024 Convertible Senior Notes”) of $29.4 million and $79.6 million , respectively (see 2019 Note Exchanges below) as of June 30, 2019 . (2) Future interest payable represents most of the interest due over the terms of our 9% Senior Secured Second Lien Notes due 2021 (the “2021 Senior Secured Notes”) and 9¼% Senior Secured Second Lien Notes due 2022 (the “2022 Senior Secured Notes”) and has been accounted for as debt in accordance with FASC 470-60, Troubled Debt Restructuring by Debtors . (3) Our current maturities of long-term debt as of June 30, 2019 include $85.7 million of future interest payable related to the 2021 Senior Secured Notes and 2022 Senior Secured Notes that is due within the next twelve months.

Commodity Derivative Contracts

Commodity Derivative Contracts (Tables)	6 Months Ended
	Jun. 30, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Commodity derivative contracts not classified as hedging instruments	The following table summarizes our commodity derivative contracts as of June 30, 2019 , none of which are classified as hedging instruments in accordance with the FASC Derivatives and Hedging topic: Months Index Price Volume (Barrels per day) Contract Prices ($/Bbl) Range (1) Weighted Average Price Swap Sold Put Floor Ceiling Oil Contracts: 2019 Fixed-Price Swaps July – Dec Argus LLS 13,000 $ 60.00 – 74.90 $ 64.69 $ — $ — $ — 2019 Three-Way Collars (2) July – Dec NYMEX 22,000 $ 55.00 – 75.45 $ — $ 48.55 $ 56.55 $ 69.17 July – Dec Argus LLS 5,500 62.00 – 86.00 — 54.73 63.09 79.93 2020 Fixed-Price Swaps Jan – Dec NYMEX 2,000 $ 60.00 – 61.00 $ 60.59 $ — $ — $ — Jan – Dec Argus LLS 4,000 60.72 – 64.26 62.41 — — — 2020 Three-Way Collars (2) Jan – June NYMEX 12,000 $ 55.00 – 82.65 $ — $ 48.89 $ 58.49 $ 65.57 Jan – June Argus LLS 4,500 62.50 – 87.10 — 53.89 63.89 72.55 July – Dec NYMEX 10,000 55.00 – 82.65 — 49.05 58.58 65.81 July – Dec Argus LLS 2,500 64.00 – 87.10 — 54.40 64.40 76.59 (1) Ranges presented for fixed-price swaps represent the lowest and highest fixed prices of all open contracts for the period presented. For three-way collars, ranges represent the lowest floor price and highest ceiling price for all open contracts for the period presented. (2) A three-way collar is a costless collar contract combined with a sold put feature (at a lower price) with the same counterparty. The value received for the sold put is used to enhance the contracted floor and ceiling price of the related collar. At the contract settlement date, (1) if the index price is higher than the ceiling price, we pay the counterparty the difference between the index price and ceiling price for the contracted volumes, (2) if the index price is between the floor and ceiling price, no settlements occur, (3) if the index price is lower than the floor price but at or above the sold put price, the counterparty pays us the difference between the index price and the floor price for the contracted volumes and (4) if the index price is lower than the sold put price, the counterparty pays us the difference between the floor price and the sold put price for the contracted volumes.

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	6 Months Ended
	Jun. 30, 2019
Fair Value Disclosures [Abstract]
Fair value hierarchy of financial assets and liabilities	The following table sets forth, by level within the fair value hierarchy, our financial assets and liabilities that were accounted for at fair value on a recurring basis as of the periods indicated: Fair Value Measurements Using: In thousands Quoted Prices in Active Markets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Total June 30, 2019 Assets Oil derivative contracts – current $ — $ 19,927 $ 4,520 $ 24,447 Oil derivative contracts – long-term — 7,935 1,553 9,488 Total Assets $ — $ 27,862 $ 6,073 $ 33,935 Liabilities Oil derivative contracts – current $ — $ (1,912 ) $ — $ (1,912 ) Oil derivative contracts – long-term — (22 ) — (22 ) Total Liabilities $ — $ (1,934 ) $ — $ (1,934 ) December 31, 2018 Assets Oil derivative contracts – current $ — $ 81,621 $ 11,459 $ 93,080 Oil derivative contracts – long-term — 2,030 2,165 4,195 Total Assets $ — $ 83,651 $ 13,624 $ 97,275
Changes in fair value of Level 3 assets and liabilities	The following table summarizes the changes in the fair value of our Level 3 assets and liabilities for the three and six months ended June 30, 2019 and 2018 : Three Months Ended Six Months Ended June 30, June 30, In thousands 2019 2018 2019 2018 Fair value of Level 3 instruments, beginning of period $ 3,686 $ — $ 13,624 $ — Fair value gains (losses) on commodity derivatives 2,720 (1,168 ) (6,360 ) (1,168 ) Receipts on settlements of commodity derivatives (333 ) — (1,191 ) — Fair value of Level 3 instruments, end of period $ 6,073 $ (1,168 ) $ 6,073 $ (1,168 ) The amount of total gains (losses) for the period included in earnings attributable to the change in unrealized gains (losses) relating to assets or liabilities still held at the reporting date $ 2,387 $ (1,168 ) $ (1,240 ) $ (1,168 )
Qualitative valuation techniques for assets and liabilities measured on a recurring basis (Level 3)	The following table details fair value inputs related to implied volatilities utilized in the valuation of our Level 3 oil derivative contracts: Fair Value at Valuation Technique Unobservable Input Volatility Range Oil derivative contracts $ 6,073 Discounted cash flow / Black-Scholes Volatility of Light Louisiana Sweet for settlement periods beginning after June 30, 2019 20.4% – 34.1%

Basis of Presentation Basis of

Basis of Presentation Basis of Presentation (Cash, Cash Equivalents, and Restricted Cash) (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018	Jun. 30, 2018	Jan. 01, 2018	Dec. 31, 2017
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]
Cash and cash equivalents	$ 341	$ 38,560
Restricted cash included in other assets	22,198	16,389
Total cash, cash equivalents, and restricted cash shown in the unaudited condensed consolidated statement of cash flows	$ 22,539	$ 54,949	$ 16,234	$ 16,000	$ 15,992

Basis of Presentation (Reconcil

Basis of Presentation (Reconciliation of Weighted Average Shares Table) (Details) - USD ($) shares in Thousands, $ in Thousands		3 Months Ended				6 Months Ended
		Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018
Numerator
Net income - basic		$ 146,692	$ (25,674)	$ 30,222	$ 39,578	$ 121,018	$ 69,800
Interest on convertible senior notes including amortization of discount, net of tax		548		130		548	539
Net income - diluted		$ 147,240		$ 30,352		$ 121,566	$ 70,339
Denominator
Weighted average common shares outstanding - basic		452,612		433,467		452,169	413,217
Restricted stock and performance-based equity awards		2,835		8,586		3,301	6,877
Convertible senior notes	[1]	11,980		15,112		5,990	34,372
Weighted average common shares outstanding - diluted		467,427		457,165		461,460	454,466
[1]	(1) For the three and six months ended June 30, 2019, shares shown under “convertible senior notes” represent the prorated portion of the approximately 90.9 million shares of the Company’s common stock issuable upon full conversion of our convertible senior notes (see Note 4, Long-Term Debt – 2019 Note Exchanges ).

Basis of Presentation (Antidilu

Basis of Presentation (Antidilutive Securities) (Details) - shares shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Stock appreciation rights
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	2,026	2,827	2,059	2,891
Restricted Stock and Performance-Based Equity Awards
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	4,998	179	4,790	305

Basis of Presentation (Details

Basis of Presentation (Details Textuals) $ in Thousands, shares in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2019USD ($)shares	Jun. 30, 2018USD ($)	Dec. 31, 2018USD ($)	Jan. 01, 2018USD ($)	Dec. 31, 2017USD ($)
Accounting Policies [Abstract]
Restricted cash	$ 22,198		$ 16,389
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	$ 22,539	$ 16,234	$ 54,949	$ 16,000	$ 15,992
Net Cash Used in Investing Activities		134,900
Debt Instrument, Convertible, Number of Equity Instruments | shares	90.9
Previously Reported
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents		41,600		40,600
Net Cash Used in Investing Activities		134,100
Adjustments
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents		25,400		$ 24,600
Net Cash Used in Investing Activities		$ 800

Basis of Presentation (Effect o

Basis of Presentation (Effect of the Adoption of ASC Topic 842 Leases) (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Jan. 01, 2019	Dec. 31, 2018
Lease Assets and Liabilities [Line Items]
Operating Lease, Liability	$ 52,130	$ 55,800
Operating Lease, Right-of-Use Asset	$ 36,421	39,100	$ 0
Pre-Existing Lease Liability [Member]
Lease Assets and Liabilities [Line Items]
Operating Lease, Liability		$ 16,700

Revenue Recognition (Disaggrega

Revenue Recognition (Disaggregation of Revenue) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Disaggregation of Revenue [Line Items]
Revenues	$ 340,998,000	$ 382,626,000	$ 644,360,000	$ 731,256,000
Oil sales
Disaggregation of Revenue [Line Items]
Revenues	328,571,000	373,286,000	620,536,000	710,692,000
Natural gas sales
Disaggregation of Revenue [Line Items]
Revenues	1,850,000	2,279,000	4,462,000	4,894,000
CO2 sales and transportation fees
Disaggregation of Revenue [Line Items]
Revenues	7,986,000	6,715,000	16,556,000	14,267,000
Purchased oil sales
Disaggregation of Revenue [Line Items]
Revenues	$ 2,591,000	$ 346,000	$ 2,806,000	$ 1,403,000

Revenue Recognition (Details Te

Revenue Recognition (Details Textuals) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Revenue from Contract with Customer [Abstract]
Accrued production receivable	$ 135,697	$ 125,788

Leases (Supplemental Balance Sh

Leases (Supplemental Balance Sheet Information Related To Leases) (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Jan. 01, 2019	Dec. 31, 2018
Operating Leases
Operating lease right-of-use assets	$ 36,421	$ 39,100	$ 0
Operating lease liabilities - current	6,739		0
Operating lease liabilities - long-term	45,391		$ 0
Total operating lease liabilities	52,130	$ 55,800
Finance leases
Other property and equipment	1,736
Accumulated depreciation	(1,465)
Other property and equipment, net	271
Current maturities of long-term debt	233
Long-term debt, net of current portion	59
Total finance lease liabilities	$ 292

Leases (Lease Term and Discount

Leases (Lease Term and Discount Rate) (Details)	Jun. 30, 2019
Weighted Average Remaining Lease Term
Operating leases	6 years 2 months 12 days
Finance leases	1 year 3 months 18 days
Weighted Average Discount Rate
Operating leases	6.80%
Finance leases	2.30%

Leases (Lease Operating Costs)

Leases (Lease Operating Costs) (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019
Leases [Abstract]
Operating lease cost	$ 2,412	$ 4,827
Finance lease cost
Amortization of right-of-use assets	264	1,134
Interest on lease liabilities	8	38
Total finance lease cost	272	1,172
Sublease income	$ 1,331	$ 2,367

Leases (Supplemental Cash Flow

Leases (Supplemental Cash Flow Information Related to Leases) (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2019USD ($)
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows from operating leases	$ 5,854
Operating cash flows from interest on finance leases	38
Financing cash flows from finance leases	1,217
Right-of-use assets obtained in exchange for lease obligations
Operating leases	294
Finance leases	$ 0

Leases (Maturities Of Lease Lia

Leases (Maturities Of Lease Liabilities) (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Jan. 01, 2019
Operating Leases
Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year	$ 5,063
2020	9,874
2021	10,042
2022	10,259
2023	10,300
Thereafter	18,537
Total minimum lease payments	64,075
Less: Amount representing interest	(11,945)
Present value of minimum lease payments	52,130	$ 55,800
Finance Leases
2019	118
2020	178
2021	0
2022	0
2023	0
Thereafter	0
Total minimum lease payments	296
Less: Amount representing interest	(4)
Present value of minimum lease payments	$ 292

Leases (Prior Year-End Schedule

Leases (Prior Year-End Schedule of Future Operating Lease Payments) (Details) $ in Thousands	Dec. 31, 2018USD ($)
Leases [Abstract]
2019	$ 10,690
2020	9,776
2021	10,007
2022	10,223
2023	10,262
Thereafter	18,169
Total minimum lease payments	$ 69,127

Long-Term Debt (Components of L

Long-Term Debt (Components of Long-Term Debt) (Details) - USD ($) $ in Thousands		Jun. 30, 2019	Jun. 19, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Senior Secured Bank Credit Agreement		$ 80,000		$ 0
Pipeline financings		174,018		180,073
Capital lease obligations		292		5,362
Total debt principal balance		2,480,892		2,532,207
Debt discount	[1]	(109,072)		0
Future interest payable	[2]	207,659		250,218
Debt issuance costs		(11,523)		(13,089)
Total debt, net of debt issuance costs and discount		2,567,956		2,769,336
Less: current maturities of long-term debt	[3]	(101,829)		(105,125)
Long-term Debt and Capital Lease Obligations		2,466,127		2,664,211
9% Senior Secured Second Lien Notes due 2021
Debt Instrument [Line Items]
Long-term Debt, Gross		$ 614,919		614,919
Debt Instrument, Interest Rate, Stated Percentage		9.00%
9 1/4% Senior Secured Second Lien Notes due 2022
Debt Instrument [Line Items]
Long-term Debt, Gross		$ 455,668		455,668
Debt Instrument, Interest Rate, Stated Percentage		9.25%
7 3/4% Senior Secured Second Lien Notes due 2024
Debt Instrument [Line Items]
Long-term Debt, Gross		$ 528,026		0
Debt discount		$ (29,400)	$ (6,900)
Debt Instrument, Interest Rate, Stated Percentage		7.75%
7 1/2% Senior Secured Second Lien Notes due 2024
Debt Instrument [Line Items]
Long-term Debt, Gross		$ 24,638		450,000
Debt Instrument, Interest Rate, Stated Percentage		7.50%
6 3/8% Convertible Senior Notes due 2024
Debt Instrument [Line Items]
Long-term Debt, Gross		$ 245,548		0
Debt discount		$ (79,600)
Debt Instrument, Interest Rate, Stated Percentage		6.375%
6 3/8% Senior Subordinated Notes due 2021
Debt Instrument [Line Items]
Long-term Debt, Gross		$ 51,304		203,545
Debt Instrument, Interest Rate, Stated Percentage		6.375%
5 1/2% Senior Subordinated Notes due 2022
Debt Instrument [Line Items]
Long-term Debt, Gross		$ 94,784		314,662
Debt Instrument, Interest Rate, Stated Percentage		5.50%
4 5/8% Senior Subordinated Notes due 2023
Debt Instrument [Line Items]
Long-term Debt, Gross		$ 211,695		307,978
Debt Instrument, Interest Rate, Stated Percentage		4.625%
Future interest payable on senior secured notes
Debt Instrument [Line Items]
Less: current maturities of long-term debt		$ (85,700)		(85,303)
Long-term Debt and Capital Lease Obligations		$ 121,982		$ 164,914
[1]	Consists of discounts related to the issuance during June 2019 of our new 7¾% Senior Secured Second Lien Notes due 2024 (the “7¾% Senior Secured Notes”) and new 6⅜% Convertible Senior Notes due 2024 (the “2024 Convertible Senior Notes”) of $29.4 million and $79.6 million , respectively (see 2019 Note Exchanges below) as of June 30, 2019
[2]	Future interest payable represents most of the interest due over the terms of our 9% Senior Secured Second Lien Notes due 2021 (the “2021 Senior Secured Notes”) and 9¼% Senior Secured Second Lien Notes due 2022 (the “2022 Senior Secured Notes”) and has been accounted for as debt in accordance with FASC 470-60, Troubled Debt Restructuring by Debtors .
[3]	Our current maturities of long-term debt as of June 30, 2019 include $85.7 million of future interest payable related to the 2021 Senior Secured Notes and 2022 Senior Secured Notes that is due within the next twelve months.

Long-Term Debt Textuals (Detail

Long-Term Debt Textuals (Details)		1 Months Ended		3 Months Ended		6 Months Ended
		Jul. 31, 2019USD ($)	Jun. 30, 2019USD ($)sharesD$ / shares	Jun. 30, 2019USD ($)shares	Jun. 30, 2018USD ($)	Jun. 30, 2019USD ($)	Jun. 30, 2018USD ($)	Jun. 19, 2019USD ($)	Dec. 31, 2018USD ($)
Debt Instrument [Line Items]
Interest in guarantor subsidiaries			100.00%	100.00%		100.00%
Borrowing base			$ 615,000,000	$ 615,000,000		$ 615,000,000
Lender commitments			615,000,000	615,000,000		$ 615,000,000
Line of Credit Facility, Interest Rate During Period						5.10%
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage						0.50%
Senior secured debt to consolidated EBITDAX						2.5
Consolidated EBITDAX to consolidated interest charges						1.25
Current ratio requirement						1
Long-Term Debt (Textual) [Abstract]
Cash paid in conjunction with debt exchange			120,000,000			$ 120,007,000	$ 0
Gain on debt extinguishment				100,346,000	$ 0	100,346,000	$ 0
Debt discount	[1]		$ 109,072,000	$ 109,072,000		109,072,000			$ 0
Debt Instrument, Convertible, Number of Equity Instruments | shares				90,900,000
Convertible Debt [Abstract]
Share conversion rate per $1,000 principal			370
Volume weighted average stock price for automatic conversion | $ / shares			$ 2.43
Threshold trading days for automatic debt conversion | D			10
Consecutive trading days threshold for automatic debt conversion | shares			15
Portion of exchange related to Senior Secured Notes
Long-Term Debt (Textual) [Abstract]
Debt Instrument, Face Amount			$ 425,400,000	$ 425,400,000		425,400,000
Gain on debt extinguishment			0
4 5/8% Senior Subordinated Notes due 2023
Long-Term Debt (Textual) [Abstract]
Debt Exchange, Amount			96,300,000
7 3/4% Senior Secured Second Lien Notes due 2024
Long-Term Debt (Textual) [Abstract]
Debt Instrument, Face Amount			$ 102,600,000	$ 102,600,000		$ 102,600,000
Debt Instrument, Interest Rate, Stated Percentage			7.75%	7.75%		7.75%
Long-term Debt, Gross			$ 528,026,000	$ 528,026,000		$ 528,026,000			0
Debt discount			$ 29,400,000	$ 29,400,000		$ 29,400,000		$ 6,900,000
Debt Instrument, Interest Rate, Effective Percentage			9.39%	9.39%		9.39%
Fair Value Issuance Percentage			94.00%	94.00%		94.00%
7 3/4% Senior Secured Second Lien Notes due 2024 | Subsequent Event
Long-Term Debt (Textual) [Abstract]
Debt Instrument, Face Amount		$ 3,800,000
7 3/4% Senior Secured Second Lien Notes due 2024 | Portion of notes exchange related to senior subordinated notes
Long-Term Debt (Textual) [Abstract]
Debt discount								22,600,000
7 3/4% Senior Secured Second Lien Notes due 2024 | Debt Instrument, Redemption, Period One
Long-Term Debt (Textual) [Abstract]
Debt Instrument, Redemption Price, Percentage			107.75%
7 3/4% Senior Secured Second Lien Notes due 2024 | Initial Redemption Period With Proceeds From Equity Offering
Long-Term Debt (Textual) [Abstract]
Debt Instrument, Percentage of Principal Amount Available To Be Redeemed			35.00%
7 3/4% Senior Secured Second Lien Notes due 2024 | Debt Instrument, Redemption, Period Two
Long-Term Debt (Textual) [Abstract]
Debt Instrument, Redemption Price, Percentage			103.875%
7 3/4% Senior Secured Second Lien Notes due 2024 | Initial Redemption Period With Make Whole Premium
Long-Term Debt (Textual) [Abstract]
Debt Instrument, Redemption Price, Percentage			100.00%
6 3/8% Convertible Senior Notes due 2024
Long-Term Debt (Textual) [Abstract]
Debt Instrument, Interest Rate, Stated Percentage			6.375%	6.375%		6.375%
Long-term Debt, Gross			$ 245,548,000	$ 245,548,000		$ 245,548,000			0
Debt discount			$ 79,600,000	$ 79,600,000		$ 79,600,000
Debt Instrument, Interest Rate, Effective Percentage			15.31%	15.31%		15.31%
Fair Value Issuance Percentage			67.00%	67.00%		67.00%
Debt Instrument, Convertible, Number of Equity Instruments | shares			90,900,000
6 3/8% Convertible Senior Notes due 2024 | Portion of notes exchange related to senior subordinated notes
Long-Term Debt (Textual) [Abstract]
Debt discount								$ 79,900,000
6 3/8% Senior Subordinated Notes due 2021
Long-Term Debt (Textual) [Abstract]
Debt Exchange, Amount			$ 152,200,000
Debt Instrument, Interest Rate, Stated Percentage			6.375%	6.375%		6.375%
Long-term Debt, Gross			$ 51,304,000	$ 51,304,000		$ 51,304,000			203,545,000
7 1/2% Senior Secured Second Lien Notes due 2024
Long-Term Debt (Textual) [Abstract]
Debt Exchange, Amount			$ 425,400,000
Debt Instrument, Interest Rate, Stated Percentage			7.50%	7.50%		7.50%
Long-term Debt, Gross			$ 24,638,000	$ 24,638,000		$ 24,638,000			$ 450,000,000
7 1/2% Senior Secured Second Lien Notes due 2024 | Subsequent Event
Long-Term Debt (Textual) [Abstract]
Debt Exchange, Amount		$ 4,000,000
5 1/2% Senior Subordinated Notes due 2022
Long-Term Debt (Textual) [Abstract]
Debt Exchange, Amount			219,900,000
Year 2019
Senior Secured Bank Credit Facility [Abstract]
Total Debt to Consolidated EBITDAX						5.25
Year 2020
Senior Secured Bank Credit Facility [Abstract]
Total Debt to Consolidated EBITDAX						5.25
Year 2021 | Q1
Senior Secured Bank Credit Facility [Abstract]
Total Debt to Consolidated EBITDAX						4.50
Year 2021 | Q2
Senior Secured Bank Credit Facility [Abstract]
Total Debt to Consolidated EBITDAX						4.5
Year 2021 | Q3
Senior Secured Bank Credit Facility [Abstract]
Total Debt to Consolidated EBITDAX						4.5
Senior Subordinated Notes
Long-Term Debt (Textual) [Abstract]
Debt Exchange, Amount			$ 468,400,000
[1]	Consists of discounts related to the issuance during June 2019 of our new 7¾% Senior Secured Second Lien Notes due 2024 (the “7¾% Senior Secured Notes”) and new 6⅜% Convertible Senior Notes due 2024 (the “2024 Convertible Senior Notes”) of $29.4 million and $79.6 million , respectively (see 2019 Note Exchanges below) as of June 30, 2019

Commodity Derivative Contract_2

Commodity Derivative Contracts (Commodity Derivatives Outstanding Table) (Details)	Jun. 30, 2019bbl / d$ / Barrel
Swap | Year 2019 | Q3-Q4 | LLS
Derivative [Line Items]
Volume per day | bbl / d	13,000
Weighted average swap price	64.69
Swap | Year 2019 | Q3-Q4 | LLS | Minimum
Derivative [Line Items]
Derivative, Swap Type, Fixed Price	60
Swap | Year 2019 | Q3-Q4 | LLS | Maximum
Derivative [Line Items]
Derivative, Swap Type, Fixed Price	74.90
Swap | Year 2020 | NYMEX
Derivative [Line Items]
Volume per day | bbl / d	2,000
Weighted average swap price	60.59
Swap | Year 2020 | NYMEX | Minimum
Derivative [Line Items]
Derivative, Swap Type, Fixed Price	60
Swap | Year 2020 | NYMEX | Maximum
Derivative [Line Items]
Derivative, Swap Type, Fixed Price	61
Swap | Year 2020 | LLS
Derivative [Line Items]
Volume per day | bbl / d	4,000
Weighted average swap price	62.41
Swap | Year 2020 | LLS | Minimum
Derivative [Line Items]
Derivative, Swap Type, Fixed Price	60.72
Swap | Year 2020 | LLS | Maximum
Derivative [Line Items]
Derivative, Swap Type, Fixed Price	64.26
Three-way Collar | Year 2019 | Q3-Q4 | NYMEX
Derivative [Line Items]
Volume per day | bbl / d	22,000
Weighted average sold put price	48.55
Weighted average floor price	56.55
Weighted average ceiling price	69.17
Three-way Collar | Year 2019 | Q3-Q4 | NYMEX | Minimum
Derivative [Line Items]
Derivative, Floor Price	55
Three-way Collar | Year 2019 | Q3-Q4 | NYMEX | Maximum
Derivative [Line Items]
Derivative, Cap Price	75.45
Three-way Collar | Year 2019 | Q3-Q4 | LLS
Derivative [Line Items]
Volume per day | bbl / d	5,500
Weighted average sold put price	54.73
Weighted average floor price	63.09
Weighted average ceiling price	79.93
Three-way Collar | Year 2019 | Q3-Q4 | LLS | Minimum
Derivative [Line Items]
Derivative, Floor Price	62
Three-way Collar | Year 2019 | Q3-Q4 | LLS | Maximum
Derivative [Line Items]
Derivative, Cap Price	86
Three-way Collar | Year 2020 | Q1-Q2 | NYMEX
Derivative [Line Items]
Volume per day | bbl / d	12,000
Weighted average sold put price	48.89
Weighted average floor price	58.49
Weighted average ceiling price	65.57
Three-way Collar | Year 2020 | Q1-Q2 | NYMEX | Minimum
Derivative [Line Items]
Derivative, Floor Price	55
Three-way Collar | Year 2020 | Q1-Q2 | NYMEX | Maximum
Derivative [Line Items]
Derivative, Cap Price	82.65
Three-way Collar | Year 2020 | Q1-Q2 | LLS
Derivative [Line Items]
Volume per day | bbl / d	4,500
Weighted average sold put price	53.89
Weighted average floor price	63.89
Weighted average ceiling price	72.55
Three-way Collar | Year 2020 | Q1-Q2 | LLS | Minimum
Derivative [Line Items]
Derivative, Floor Price	62.50
Three-way Collar | Year 2020 | Q1-Q2 | LLS | Maximum
Derivative [Line Items]
Derivative, Cap Price	87.10
Three-way Collar | Year 2020 | Q3-Q4 | NYMEX
Derivative [Line Items]
Volume per day | bbl / d	10,000
Weighted average sold put price	49.05
Weighted average floor price	58.58
Weighted average ceiling price	65.81
Three-way Collar | Year 2020 | Q3-Q4 | NYMEX | Minimum
Derivative [Line Items]
Derivative, Floor Price	55
Three-way Collar | Year 2020 | Q3-Q4 | NYMEX | Maximum
Derivative [Line Items]
Derivative, Cap Price	82.65
Three-way Collar | Year 2020 | Q3-Q4 | LLS
Derivative [Line Items]
Volume per day | bbl / d	2,500
Weighted average sold put price	54.40
Weighted average floor price	64.40
Weighted average ceiling price	76.59
Three-way Collar | Year 2020 | Q3-Q4 | LLS | Minimum
Derivative [Line Items]
Derivative, Floor Price	64
Three-way Collar | Year 2020 | Q3-Q4 | LLS | Maximum
Derivative [Line Items]
Derivative, Cap Price	87.10

Fair Value Measurements (Fair V

Fair Value Measurements (Fair Value Hierarchy Table) (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Oil derivative contracts - current assets	$ 24,447	$ 93,080
Oil derivative contracts - long-term assets	9,488	4,195
Total Assets	33,935	97,275
Oil derivative contracts - current liabilities	(1,912)	0
Oil derivative contracts - long-term liabilities	(22)	0
Total Liabilities	(1,934)
Quoted Prices in Active Markets (Level 1)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Oil derivative contracts - current assets	0	0
Oil derivative contracts - long-term assets	0	0
Total Assets	0	0
Oil derivative contracts - current liabilities	0
Oil derivative contracts - long-term liabilities	0
Total Liabilities	0
Significant Other Observable Inputs (Level 2)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Oil derivative contracts - current assets	19,927	81,621
Oil derivative contracts - long-term assets	7,935	2,030
Total Assets	27,862	83,651
Oil derivative contracts - current liabilities	(1,912)
Oil derivative contracts - long-term liabilities	(22)
Total Liabilities	(1,934)
Significant Unobservable Inputs (Level 3)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Oil derivative contracts - current assets	4,520	11,459
Oil derivative contracts - long-term assets	1,553	2,165
Total Assets	6,073	$ 13,624
Oil derivative contracts - current liabilities	0
Oil derivative contracts - long-term liabilities	0
Total Liabilities	$ 0

Fair Value Measurements (Level

Fair Value Measurements (Level 3 Fair Value Measurements) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Fair Value, Net Derivative Asset Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Fair value of Level 3 instruments, beginning of period	$ 3,686	$ 0	$ 13,624	$ 0
Fair value gains (losses) on commodity derivatives	2,720	(1,168)	(6,360)	(1,168)
Receipts on settlements of commodity derivatives	(333)	0	(1,191)	0
Fair value of Level 3 instruments, end of period	6,073	(1,168)	6,073	(1,168)
The amount of total gains (losses) for the period included in earnings attributable to the change in unrealized gains (losses) relating to assets or liabilities still held at the reporting date	$ 2,387	$ (1,168)	$ (1,240)	$ (1,168)

Fair Value Measurements (Leve_2

Fair Value Measurements (Level 3 Valuation Techniques) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017
Fair Value Measurements, Recurring and nonrecurring, Valuation Techniques [Line Items]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs	$ 6,073	$ 3,686	$ 13,624	$ (1,168)	$ 0	$ 0
Income Approach Valuation Technique
Fair Value Measurements, Recurring and nonrecurring, Valuation Techniques [Line Items]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs	$ 6,073
Income Approach Valuation Technique | Minimum
Fair Value Measurements, Recurring and nonrecurring, Valuation Techniques [Line Items]
Expected Volatility Range	20.40%
Income Approach Valuation Technique | Maximum
Fair Value Measurements, Recurring and nonrecurring, Valuation Techniques [Line Items]
Expected Volatility Range	34.10%

Fair Value Measurements (Detail

Fair Value Measurements (Details Textuals) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Fair Value Disclosures [Abstract]
Sensitivity Analysis of Fair Value, Impact of 100 Basis Point Increase or Decrease in Level 3 Inputs	$ 150
Debt, Fair Value	$ 1,935,600	$ 1,886,100

Commitments and Contingencies (

Commitments and Contingencies (Helium Supply Arrangement) (Details) $ in Millions	6 Months Ended
	Jun. 30, 2019USD ($)
Commitments and Contingencies Disclosure [Abstract]
Term of long term supply arrangement	20 years
Maximum annual payment in event of shortfall	$ 8
Maximum payment in event of shortfall	$ 46

Commitments and Contingencies_2

Commitments and Contingencies (Loss Contingencies) (Details) $ in Millions	Jun. 30, 2019USD ($)
Loss Contingencies [Line Items]
Estimated Litigation Liability	$ 50.2
Total liquidated damages
Loss Contingencies [Line Items]
Estimated Litigation Liability	46
Other costs associated with the settlement
Loss Contingencies [Line Items]
Estimated Litigation Liability	4.2
Liquidated damages for contract years ending July 31, 2018 and July 31, 2019
Loss Contingencies [Line Items]
Estimated Litigation Liability	$ 14.2

Subsequent Event (Details Textu

Subsequent Event (Details Textuals) - Subsequent Event	Jul. 17, 2019$ / sharesRateshares
Subsequent Event [Line Items]
Value (per share) of restricted stock granted | $ / shares	$ 1.17
Stock price floor | $ / shares	$ 2.25
Equity award vesting percentage | Rate	33.00%
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	3 years
Restricted Stock
Subsequent Event [Line Items]
Grants during period | shares	9,115,746
Cash Settled Restricted Stock Units
Subsequent Event [Line Items]
Grants during period | shares	3,759,051