Chaparral Energy (CHAP) 10-Q 7 Nov 16 2016 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2016	Nov. 07, 2016
Entity Information [Line Items]
Entity Registrant Name	Chaparral Energy, Inc.
Entity Central Index Key	1,346,980
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Document Type	10-Q
Document Period End Date	Sep. 30, 2016
Document Fiscal Year Focus	2,016
Document Fiscal Period Focus	Q3
Amendment Flag	false
Common Class A
Entity Information [Line Items]
Entity Common Stock, Shares Outstanding		333,686
Common Class B
Entity Information [Line Items]
Entity Common Stock, Shares Outstanding		344,859
Common Class C
Entity Information [Line Items]
Entity Common Stock, Shares Outstanding		209,882
Common Class E
Entity Information [Line Items]
Entity Common Stock, Shares Outstanding		504,276
Common Class F
Entity Information [Line Items]
Entity Common Stock, Shares Outstanding		1
Common Class G
Entity Information [Line Items]
Entity Common Stock, Shares Outstanding		2

Consolidated balance sheets

Consolidated balance sheets - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 189,361	$ 17,065
Accounts receivable, net	41,273	79,000
Inventories, net	8,121	12,329
Prepaid expenses	2,945	3,700
Derivative instruments	0	143,737
Total current assets	241,700	255,831
Property and equipment—at cost, net	43,179	48,962
Oil and natural gas properties, using the full cost method:
Proved	4,279,179	4,128,193
Unevaluated (excluded from the amortization base)	17,115	66,905
Accumulated depreciation, depletion, amortization and impairment	(3,763,423)	(3,396,261)
Total oil and natural gas properties	532,871	798,837
Derivative instruments	0	19,501
Deferred income taxes	0	53,914
Other assets	8,253	27,694
Total assets	826,003	1,204,739
Current liabilities:
Accounts payable and accrued liabilities	32,003	66,222
Accrued payroll and benefits payable	2,553	15,305
Accrued interest payable	107	23,303
Revenue distribution payable	8,874	12,391
Long-term debt and capital leases, classified as current	472,435	1,607,127
Deferred income taxes		53,914
Total current liabilities	515,972	1,778,262
Stock-based compensation		400
Asset retirement obligations	50,211	46,434
Liabilities subject to compromise	1,286,828
Commitments and contingencies (Note 9)
Stockholders’ deficit:
Preferred stock, 600,000 shares authorized, none issued and outstanding	0	0
Additional paid in capital	425,207	431,307
Accumulated deficit	(1,452,229)	(1,051,678)
Total stockholders' deficit	(1,027,008)	(620,357)
Total liabilities and stockholders' deficit	826,003	1,204,739
Common Class A
Stockholders’ deficit:
Common stock	4	4
Common Class B
Stockholders’ deficit:
Common stock	3	3
Common Class C
Stockholders’ deficit:
Common stock	2	2
Common Class E
Stockholders’ deficit:
Common stock	5	5
Common Class F
Stockholders’ deficit:
Common stock	0	0
Common Class G
Stockholders’ deficit:
Common stock	$ 0	$ 0

Consolidated balance sheets (Pa

Consolidated balance sheets (Parenthetical) - $ / shares	Sep. 30, 2016	Dec. 31, 2015
Preferred stock, shares authorized	600,000	600,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common Class A
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	10,000,000	10,000,000
Common stock, shares issued	334,545	345,289
Common stock, shares outstanding	334,545	345,289
Common Class B
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	10,000,000	10,000,000
Common stock, shares issued	344,859	344,859
Common stock, shares outstanding	344,859	344,859
Common Class C
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	10,000,000	10,000,000
Common stock, shares issued	209,882	209,882
Common stock, shares outstanding	209,882	209,882
Common Class E
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	10,000,000	10,000,000
Common stock, shares issued	504,276	504,276
Common stock, shares outstanding	504,276	504,276
Common Class F
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	1	1
Common stock, shares issued	1	1
Common stock, shares outstanding	1	1
Common Class G
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	3	3
Common stock, shares issued	2	2
Common stock, shares outstanding	2	2

Consolidated statements of oper

Consolidated statements of operations - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Income Statement [Abstract]
Revenues - commodity sales	$ 65,847	$ 74,512	$ 180,076	$ 261,801
Costs and expenses:
Lease operating	22,291	24,881	68,462	83,921
Transportation and processing	2,429	1,902	6,493	6,246
Production taxes	2,174	2,795	6,812	11,123
Depreciation, depletion and amortization	29,624	52,027	94,396	173,694
Loss on impairment of oil and gas assets	0	737,758	281,079	955,320
Loss on impairment of other assets	202	0	1,461	13,311
General and administrative	1,519	7,389	14,812	25,843
Liability management	0	0	9,396	0
Cost reduction initiatives	89	603	3,228	9,739
Total costs and expenses	58,328	827,355	486,139	1,279,197
Operating income (loss)	7,519	(752,843)	(306,063)	(1,017,396)
Non-operating income (expense):
Interest expense	(7,436)	(28,598)	(57,243)	(83,202)
Non-hedge derivative gains (losses)	0	85,415	(9,468)	105,266
Write-off of Senior Note issuance costs, discount and premium	0	0	(16,970)	0
Other (expense) income, net	(129)	108	217	2,088
Net non-operating (expense) income	(7,565)	56,925	(83,464)	24,152
Reorganization items, net	(5,504)	0	(10,859)	0
Loss before income taxes	(5,550)	(695,918)	(400,386)	(993,244)
Income tax (benefit) expense	(59)	(48,776)	165	(161,314)
Net loss	$ (5,491)	$ (647,142)	$ (400,551)	$ (831,930)

Consolidated statements of cash

Consolidated statements of cash flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Cash flows from operating activities
Net loss	$ (400,551)	$ (831,930)
Adjustments to reconcile net loss to net cash provided by operating activities
Depreciation, depletion and amortization	94,396	173,694
Loss on impairment of assets	282,540	968,631
Write-off of Senior Note issuance costs, discount and premium	16,970	0
Deferred income taxes		(161,480)
Non-hedge derivative losses (gains)	9,468	(105,266)
Loss (gain) on sale of assets	128	(1,448)
Other	2,832	4,013
Change in assets and liabilities
Accounts receivable	(4,866)	16,625
Inventories	2,758	(3,642)
Prepaid expenses and other assets	(370)	2,258
Accounts payable and accrued liabilities	24,026	(15,012)
Revenue distribution payable	1,173	(12,444)
Stock-based compensation	(5,384)	(4,355)
Net cash provided by operating activities	23,120	29,644
Cash flows from investing activities
Expenditures for property, plant, and equipment and oil and natural gas properties	(119,994)	(267,203)
Proceeds from asset dispositions	954	29,251
Proceeds from non-hedge derivative instruments	90,590	173,149
Cash in escrow	49
Net cash used in investing activities	(28,401)	(64,803)
Cash flows from financing activities
Proceeds from long-term debt	181,000	120,000
Repayment of long-term debt	(1,563)	(75,354)
Principal payments under capital lease obligations	(1,860)	(1,792)
Payment of other financing fees		(1,404)
Net cash provided by financing activities	177,577	41,450
Net increase in cash and cash equivalents	172,296	6,291
Cash and cash equivalents at beginning of period	17,065	31,492
Cash and cash equivalents at end of period	$ 189,361	$ 37,783

Nature of operations and summar

Nature of operations and summary of significant accounting policies	9 Months Ended
	Sep. 30, 2016
Accounting Policies [Abstract]
Nature of operations and summary of significant accounting policies	Note 1: Nature of operations and summary of significant accounting policies Nature of operations Chaparral Energy, Inc. and its subsidiaries, (collectively, “we”, “our”, “us”, or the “Company”) are involved in the acquisition, exploration, development, production and operation of oil and natural gas properties. Our properties are located primarily in Oklahoma and Texas. As discussed in “Note 2—Chapter 11 filing,” we are currently operating our business as debtor in possession in accordance with the applicable provisions of the Bankruptcy Code. Interim financial statements The accompanying unaudited consolidated interim financial statements of the Company have been prepared in accordance with the rules and regulations of the SEC and do not include all of the financial information and disclosures required by accounting principles generally accepted in the United States of America (“GAAP”) 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, 2015. The financial information as of September 30, 2016, and for the three and nine months ended September 30, 2016, and 2015, respectively, is unaudited. The financial information as of December 31, 2015, has been derived from the audited financial statements contained in our Annual Report on Form 10-K for the year ended December 31, 2015. In management’s opinion, such information contains all adjustments considered necessary for a fair presentation of the results of the interim periods. The results of operations for the three and nine months ended September 30, 2016, are not necessarily indicative of the results of operations that will be realized for the year ended December 31, 2016. Cash and cash equivalents We maintain cash and cash equivalents in bank deposit accounts and money market funds which may not be federally insured. As of September 30, 2016, cash with a recorded balance totaling $37,535 and $49,852 was held at JP Morgan Chase Bank, N.A and Arvest Bank, respectively. In addition, we also held cash equivalents in the form of treasury securities with a recorded balance of $101,095 at Arvest Wealth Management. We have not experienced any losses in such accounts and believe we are not exposed to any significant credit risk on such accounts. We are not party to any valid blocked account agreements with respect to any material amount of cash. Accounts receivable We have receivables from joint interest owners and oil and natural gas purchasers which are generally uncollateralized. Accounts receivable consisted of the following at September 30, 2016, and December 31, 2015: September 30, December 31, 2016 2015 Joint interests $ 10,471 $ 14,149 Accrued commodity sales 26,628 21,645 Derivative settlements — 40,380 Other 4,669 3,329 Allowance for doubtful accounts (495 ) (503 ) $ 41,273 $ 79,000 Inventories Inventories consisted of the following at September 30, 2016, and December 31, 2015: September 30, December 31, 2016 2015 Equipment inventory $ 9,066 $ 11,470 Commodities 1,355 1,698 Inventory valuation allowance (2,300 ) (839 ) $ 8,121 $ 12,329 We recorded lower of cost or market adjustments for the periods disclosed below due to depressed industry conditions which resulted in lower demand for such equipment and hence lower market prices. These adjustments are reflected in “Loss on impairment of other assets” in our consolidated statements of operations. Three months ended Nine months ended September 30, September 30, 2016 2015 2016 2015 Inventory - lower of cost or market adjustment $ 202 $ — $ 1,461 $ 7,296 Oil and natural gas properties The costs of unevaluated oil and natural gas properties, which are excluded from amortization until the properties are evaluated, consisted of the following at September 30, 2016, and December 31, 2015: September 30, December 31, 2016 2015 Undeveloped acreage $ 13,864 $ 60,031 Wells and facilities in progress pending determination 3,251 6,874 Total unevaluated oil and natural gas properties excluded from amortization $ 17,115 $ 66,905 Ceiling Test. In accordance with the full cost method of accounting, the net capitalized costs of oil and natural gas properties are not to exceed their related PV-10 value, net of tax considerations, plus the cost of unproved properties not being amortized. Our estimates of oil and natural gas reserves as of September 30, 2016, were prepared using an average price for oil and natural gas on the first day of each month for the prior twelve months as required by the SEC. Due to the substantial decline of commodity prices that began in mid-2014 and which continue to remain low, the cost center ceiling exceeded the net capitalized cost of our oil and natural gas properties at the end of each quarter beginning with the second quarter of 2015 through the second quarter of 2016, resulting in ceiling test write-downs in those periods. The amount of any future impairment is generally difficult to predict, and will depend on the average oil and natural gas prices during each period, the incremental proved reserves added during each period, and additional capital spent Impairment of long-lived assets We recorded impairment losses of $6,015 related to four drilling rigs not currently in use for the nine months ended September 30, 2015. One of the rigs was last deployed in January 2015 while the remaining three have been stacked for three to four years. The loss was recorded as a result of the deterioration in commodity prices and drilling activity whereby the value of such equipment had declined while utilizing third party equipment had become more cost effective, resulting in us impairing the value of the rigs to their estimated fair value. These losses are reflected in “Loss on impairment of other assets” in our consolidated statements of operations. Our bankruptcy filing on May 9, 2016, (see “Note 2—Chapter 11 filing) was an event that required an assessment whether the carrying amounts of our long-lived assets would be recoverable. Our evaluation indicated that no additional impairment was necessary as a direct result of the bankruptcy. In October 2016, the Company entered into an agreement for the sale of our four drilling rigs for a price of $2,000. We anticipate the sale to close in January, 2017. Income taxes Although we recorded a net loss for the nine months ended September 30, 2016, we did not record any corresponding tax benefit as any deferred tax asset arising from the loss is currently not believed to be realizable and is therefore reduced by a valuation allowance. At September 30, 2016, our valuation allowance is $580,280 which reduces our net deferred tax assets to zero value as we continue to believe that it is more likely than not that we will not realize the deferred tax assets primarily related to our cumulative net operating losses. Income tax recognized for the nine months ended September 30, 2016, is a result of current Texas margin tax on gross revenues less certain deductions. See “Note 10—Income Taxes” in Item 8. Financial Statement and Supplementary Data of our Annual Report on Form 10-K for the year ended December 31, 2015, for additional information about our income taxes. As described in “Note 2—Chapter 11 filing ”, The IRC provides an annual limitation with respect to the ability of a corporation to utilize its tax attributes, as well as certain built-in-losses, against future taxable income in the event of a change in ownership. Emergence from Chapter 11 bankruptcy proceedings may result in a change in ownership for purposes of the IRC. However, the IRC provides alternatives for taxpayers in Chapter 11 bankruptcy proceedings that may or may not result in an annual limitation. We are in the process of determining which alternatives are most beneficial to us in conjunction with our ongoing negotiations with our debtholders. Liability management Liability management expense includes third party legal and professional service fees incurred from our activities to restructure our debt and in preparation for our bankruptcy petition. As a result of our Chapter 11 petition, such expenses, to the extent that they are incremental and directly related to our bankruptcy reorganization, are reflected in “Reorganization items” in our consolidated statements of operations. Cost reduction initiatives Cost reduction initiatives include expenses related to our efforts to reduce our capital, operating and administrative costs in response to the depressed commodity pricing environment. The expense consists of costs for one-time severance and termination benefits in connection with our reductions in force and third party legal and professional services we have engaged to assist in our cost savings initiatives as follows: Three months ended Nine months ended September 30, September 30, 2016 2015 2016 2015 One-time severance and termination benefits $ 89 $ 596 $ 3,125 $ 7,467 Professional fees — 7 103 2,272 Total cost reduction initiatives expense $ 89 $ 603 $ 3,228 $ 9,739 Recently adopted accounting pronouncements In November 2015, the FASB issued authoritative guidance aimed at simplifying the accounting for deferred taxes. To simplify presentation, the new guidance requires that all deferred tax assets and liabilities, along with any related valuation allowance, be classified as noncurrent on the balance sheet. As a result, each jurisdiction will now only have one net noncurrent deferred tax asset or liability. Importantly, the guidance does not change the existing requirement that only permits offsetting within a jurisdiction – that is, companies are still prohibited from offsetting deferred tax liabilities from one jurisdiction against deferred tax assets of another jurisdiction. This guidance was early adopted on a prospective basis during the second quarter of 2016 and allowed us to offset our noncurrent deferred income tax asset with our current deferred income tax liability. Other than the preceding balance sheet change, the adoption did not have a material impact on our financial statements and results of operations. Recently issued accounting pronouncements In May 2014, the FASB issued authoritative guidance that supersedes previous revenue recognition requirements and requires entities to recognize revenue in a way that depicts the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The FASB recently approved a delay which will make the updated guidance effective for fiscal years beginning after December 15, 2017, including interim periods within that reporting period. Early adoption is permitted only for fiscal years beginning after December 31, 2016, and interim periods thereafter. We are currently evaluating the effect the new standard will have on our financial statements and results of operations. In January 2016, the FASB issued authoritative guidance that amends existing requirements on the classification and measurement of financial instruments. The standard principally affects accounting for equity investments and financial liabilities where the fair value option has been elected. The guidance is effective for fiscal years beginning after December 15, 2017, and interim periods thereafter. Early adoption of certain provisions is permitted. We do not expect this guidance to materially impact our financial statements or results of operations. In February 2016, the FASB issued authoritative guidance significantly amending the current accounting for leases. Under the new provisions, all lessees will report a right-of-use asset and a liability for the obligation to make payments for all leases with the exception of those leases with a term of 12 months or less. Furthermore, all leases will fall into one of two categories: (i) a financing lease or (ii) an operating lease. Lessor accounting remains substantially unchanged with the exception that no leases entered into after the effective date will be classified as leveraged leases. For sale leaseback transactions, a sale will only be recognized if the criteria in the new revenue recognition standard are met. For public business entities, this guidance is effective for fiscal periods beginning after December 15, 2018 and interim periods thereafter. Early adoption is permitted. We are currently evaluating the effect the new guidance will have on our financial statements and results of operations. In March 2016, the FASB issued authoritative guidance with the objective to simplify several aspects of the accounting for share-based payments, including accounting for income taxes when awards vest or are settled, statutory withholdings and accounting for forfeitures. Classification of these aspects on the statement of cash flows is also addressed. For public business entities, this guidance is effective for fiscal periods beginning after December 15, 2016, and interim periods thereafter. Early adoption is permitted. We do not expect this guidance to materially impact our financial statements or results of operations in connection with our outstanding awards. In March 2016, the FASB issued authoritative guidance that clarifies that the assessment of whether an embedded contingent put or call option in a financial instrument is clearly and closely related to the debt host requires only an analysis of the four-step decision sequence described in ASC 815. The guidance is effective for fiscal years beginning after December 15, 2016. Early adoption is permitted in any interim period for which financial statements have not been issued, but would be retroactively applied to the beginning of the year that includes the interim period. We do not expect this guidance to materially impact our financial statements or results of operations. In June 2016, the FASB issued authoritative guidance which modifies the measurement of expected credit losses of certain financial instruments. The guidance is effective for fiscal years beginning after December 15, 2020, however early adoption is permitted for fiscal years beginning after December 15, 2018. We are currently evaluating the effect the new guidance will have on our financial statements and results of operations.

Chapter 11 Filing

Chapter 11 Filing	9 Months Ended
	Sep. 30, 2016
Reorganizations [Abstract]
Chapter 11 Filing	Note 2: Chapter 11 filing Background. The severe and sustained decline in oil and natural gas prices since mid-2014 has negatively impacted revenues, earnings and cash flows, and our liquidity. As a result of our deteriorating liquidity, there was uncertainty regarding our ability to repay our outstanding debt obligations as they became due, especially in the event of any acceleration of indebtedness, and hence substantial doubt about our ability to continue as a going concern. This doubt was expressed in the audit opinion of our annual consolidated financial statements for the year ended December 31, 2015, and constituted an event of default under our Credit Facility since the covenants under the facility require us to deliver our annual financial statements without a going concern explanatory paragraph. On March 1 and April 1, 2016, we elected not to make interest payments on our 8.25% Senior Notes and 9.875% Senior Notes, respectively. Under the indenture governing these Senior Notes, the failure to make the interest payments was subject to a 30-day grace period before constituting an event of default. We did not make either interest payment on the Senior Notes within their respective 30-day grace periods and as a result, are currently in default under the indentures governing these Senior Notes. While in default, the outstanding principal and any accrued interest may be called upon which would cause it to be immediately due and payable. Our failure to make such interest payments within the 30-day grace period also resulted in a cross default under our Credit Facility, capital leases and mortgage note. The defaults discussed above result in cross defaults on our remaining indebtedness and therefore subjected all our debt to potential acceleration in the event that the outstanding amounts are called by our lenders. Faced with these defaults, we entered into agreements (the “Forbearance Agreements”) with the lenders under our Credit Facility (the “Lenders”) and an ad hoc committee (the “Ad Hoc Committee”) of noteholders collectively holding more than 50% of the Senior Notes outstanding to forbear from exercising remedies on account of the missed interest payments and certain other alleged defaults specified in the Forbearance Agreements through and including May 1, 2016. While the Forbearance Agreements were in effect, we continued to engage in good-faith arm’s-length negotiations regarding a potential restructuring of the Credit Facility and the Senior Notes that would materially delever the Company’s balance sheet and allow us to retain sufficient liquidity to continue to operate our business going forward. In the course of these negotiations, the Company, the Lenders, and the Ad Hoc Committee exchanged and considered, with the assistance of their respective advisors, numerous restructuring proposals. On May 9, 2016 (the “Petition Date”), Chaparral Energy, Inc. and its subsidiaries including Chaparral Energy, L.L.C., Chaparral Resources, L.L.C., Chaparral Real Estate, L.L.C., Chaparral CO2 , L.L.C., CEI Pipeline, L.L.C., CEI Acquisition, L.L.C., Green Country Supply, Inc., Chaparral Biofuels, L.L.C., Chaparral Exploration, L.L.C., Roadrunner Drilling, L.L.C. (collectively, the “Chapter 11 Subsidiaries” and, together with Chaparral Energy, Inc., the “Debtors”) filed voluntary petitions seeking relief under Title 11 of the United States Code (the “Bankruptcy Code”) in the United States Bankruptcy Court for the District of Delaware (the “Bankruptcy Court”) commencing cases for relief under chapter 11 of the Bankruptcy Code (the “Chapter 11 Cases”). Our filing of the Chapter 11 Cases constitutes an additional event of default under our Credit Facility, Senior Notes, capital leases and mortgage note. Debtor-In-Possession. We are currently operating our business as debtors in possession in accordance with the applicable provisions of the Bankruptcy Code. We have filed a variety of first day motions with the Bankruptcy Court that will allow us to continue to operate our business without interruption. These motions are designed primarily to minimize the impact of our bankruptcy filing on our operations, creditors and employees. The Bankruptcy Court has granted all first day motions filed by us and our Chapter 11 Subsidiaries. As a result, we are able to conduct normal business activities and pay the associated obligations for the period following our bankruptcy filing and are also authorized to pay (subject to caps applicable to payments of certain pre-petition obligations) pre-petition employee wages and benefits, pre-petition amounts owed to certain lienholders and critical vendors and funds belonging to third parties, including royalty interest holders and partners. During the pendency of the Chapter 11 Cases, all transactions outside the ordinary course of our business require the prior approval of the Bankruptcy Court. Final orders on the motions to satisfy our obligations to certain third parties and to forward funds held by us that belong to third parties were granted on June 7, 2016. Automatic Stay. Subject to certain exceptions, under the Bankruptcy Code, the filing of the bankruptcy petitions automatically enjoined, or stayed, the continuation of most judicial or administrative proceedings or the filing of other actions against us or our property to recover, collect or secure a claim arising prior to the Petition Date. Creditors are stayed from taking any actions against us as a result of debt defaults, subject to certain limited exceptions permitted by the Bankruptcy Code. Risks Associated with Chapter 11 Proceedings. For the duration of our Chapter 11 Cases, our operations and ability to develop and execute our business plan are subject to the risks and uncertainties associated with the Chapter 11 process. As a result of these risks and uncertainties, the number of our outstanding shares of common stock and stockholders, assets, liabilities, officers and/or directors could be significantly different following the outcome of the Chapter 11 Cases, and the description of our operations, properties and capital plans included in this quarterly report may not accurately reflect our operations, properties and capital plans following our emergence from bankruptcy. Executory Contracts. In particular, subject to certain exceptions, under the Bankruptcy Code, we may assume, assign, or reject certain executory contracts and unexpired leases subject to the approval of the Bankruptcy Court and certain other conditions. Generally, the rejection of an executory contract or unexpired lease is treated as a pre-petition breach of such executory contract or unexpired lease and, subject to certain exceptions, relieves us of performing future obligations under such executory contract or unexpired lease but entitles the contract counterparty or lessor to a pre-petition general unsecured claim for damages caused by such deemed breach. Counterparties to such rejected contracts or leases may assert unsecured claims in the Bankruptcy Court against the applicable Debtors’ estate for such damages. Generally, the assumption of an executory contract or unexpired lease requires us to cure existing monetary defaults under such executory contract or unexpired lease and provide adequate assurance of future performance. Accordingly, any description of an executory contract or unexpired lease involving us in these financial statements, including where applicable, a quantification of our obligations under any such executory contract or unexpired lease with us is qualified by our rights to reject such executory contract or unexpired lease under the Bankruptcy Code. Magnitude of Potential Claims . On June 29, 2016, we filed with the Bankruptcy Court schedules and statements setting forth, among other things, our assets and liabilities, subject to the assumptions filed in connection therewith (as amended on August 9 and August 18, 2016, the “Schedules and Statements”). We may subsequently decide to further amend or modify our Schedules and Statements. On June 13, 2016, we filed a motion to set a bar date to assist with the claims reconciliation process. The Bankruptcy Court approved such motion on July 1, 2016, setting the bar date on August 19, 2016, for all potential claimants other than governmental authorities whose bar date is on November 7, 2016. Through the claims resolution process, differences in amounts scheduled by the Debtors and claims filed by creditors will be investigated and resolved, including through the filing of objections with the Bankruptcy Court where appropriate. In light of the potential number and amount of claims filed, the claims resolution process may take considerable time to complete, and we expect that it will continue after our emergence from bankruptcy. Accordingly, the ultimate number and amount of allowed claims is not presently known, nor can the ultimate recovery with respect to allowed claims be presently ascertained. Effect of Filing on Creditors and Shareholders. Under the priority scheme established by the Bankruptcy Code, unless creditors agree otherwise, pre-petition liabilities and post-petition liabilities must be satisfied in full or consensual agreement reached between parties before the holders of our existing common stock are entitled to receive any distribution or retain any property under a plan of reorganization. The ultimate recovery to creditors and/or shareholders, if any, will not be determined until confirmation and implementation of a plan or plans of reorganization. No assurance can be given as to what values, if any, will be ascribed in the Chapter 11 proceedings to each of these constituencies or what types or amounts of distributions, if any, they would receive. A plan of reorganization could result in holders of our liabilities and/or securities, including our common stock, receiving no distribution on account of their interests and cancellation of their holdings. As discussed below, if certain requirements of the Bankruptcy Code are met, a plan of reorganization can be confirmed notwithstanding its rejection by the holders of our common stock and notwithstanding the fact that such holders do not receive or retain any property on account of their equity interests under the plan. Because of such possibilities, the value of our securities is highly speculative. Process for Plan of Reorganization. In order to successfully exit bankruptcy, we will need to propose, and obtain confirmation by the Bankruptcy Court of, a plan (or plans) of reorganization that satisfies the requirements of the Bankruptcy Code. A plan of reorganization would, among other things, resolve our pre-petition obligations, set forth the revised capital structure of the newly reorganized entity and provide for corporate governance subsequent to exit from bankruptcy. We have the exclusive right for 120 days after the Petition Date to file a plan of reorganization subject to extension for cause. If the Exclusive Filing Period lapses, any party in interest may file a plan of reorganization for any of the Debtors. On October 13, 2016, the Bankruptcy Court approved our motion to extend the Exclusive Filing Period to November 9, 2016, and we expect to request a further extension. In addition to being voted on by holders of impaired claims and equity interests, a plan of reorganization must satisfy certain requirements of the Bankruptcy Code and must be confirmed, by the Bankruptcy Court in order to become effective. A plan of reorganization would be accepted by holders of claims against and equity interests in us if (i) more than one-half in number and at least two-thirds in dollar amount of allowed claims actually voting in each class of claims impaired by the plan have voted to accept the plan and (ii) at least two-thirds in amount of allowed equity interests actually voting in each class of equity interests impaired by the plan has voted to accept the plan. A class of claims or equity interests that does not receive or retain any property under the plan on account of such claims or interests is deemed to have voted to reject the plan. Under certain circumstances set forth in Section 1129(b) of the Bankruptcy Code, the Bankruptcy Court may confirm a plan even if such plan has not been accepted by all impaired classes of claims and equity interests. The precise requirements and evidentiary showing for confirming a plan notwithstanding its rejection by one or more impaired classes of claims or equity interests depends upon a number of factors, including the status and seniority of the claims or equity interests in the rejecting class (i.e., secured claims or unsecured claims, subordinated or senior claims, preferred or common stock). Generally, with respect to common stock interests, a plan may be “crammed down” even if the shareholders receive no recovery if the proponent of the plan demonstrates that (1) no class junior to the common stock is receiving or retaining property under the plan and (2) no class of claims or interests senior to the common stock is being paid more than in full. Our timing of filing a plan of reorganization will depend on the timing and outcome of numerous other ongoing matters in the Chapter 11 Cases. Although we expect to file a plan of reorganization that provides for emergence from bankruptcy as a going concern, there can be no assurance at this time that we will be able to successfully develop, confirm and consummate one or more plans of reorganization or other alternative restructuring transactions, that satisfies the conditions of the Bankruptcy Code and is confirmed by the Bankruptcy Court, or that any such plan will be implemented successfully. Basis of Accounting. As noted above, the uncertainty regarding our ability to meet our debt obligations and the resultant filing of the Chapter 11 Cases raises substantial doubt about our ability to continue as a going concern. The accompanying consolidated financial statements have been prepared on a going concern basis of accounting, which contemplates continuity of operations, realization of assets, and satisfaction of liabilities and commitments in the normal course of business. The accompanying consolidated financial statements do not purport to reflect or provide for the consequences of our Chapter 11 Cases, other than as set forth under “Liabilities subject to compromise” and “Reorganization items” on the accompanying consolidated financial statements. In particular, the financial statements do not purport to show (i) as to assets, their realizable value on a liquidation basis or their availability to satisfy liabilities; (ii) as to pre-petition liabilities, the amounts that may be allowed for claims or contingencies, or the status and priority thereof; (iii) as to stockholders’ equity accounts, the effect of any changes that may be made in our capitalization; or (iv) as to operations, the effect of any changes that may be made to our business. We have accounted for the bankruptcy in accordance with Accounting Standards Codification 852, Reorganizations . Liabilities Subject to Compromise. Our financial statements include amounts classified as liabilities subject to compromise which represent estimates of pre-petition obligations that we anticipate will be allowed as claims in our bankruptcy case. These liabilities are reported at the amounts expected to be allowed by the Bankruptcy Court, even if they may be settled for lesser amounts. The amounts currently classified as liabilities subject to compromise may be subject to future adjustments depending on the Bankruptcy Court actions, further development with respect to disputed claims, and other events. Additional amounts may be included in liabilities subject to compromise in future periods if executory contracts and unexpired leases are rejected. Conversely, to the extent that such executory contracts or unexpired leases are not rejected and are instead assumed, certain liabilities characterized as subject to compromise may be converted to post-petition liabilities. Because of the uncertain nature of many of the potential claims, the magnitude of such claims is not reasonably estimable at this time. We will continue to evaluate these liabilities during the pendency of the Chapter 11 Cases and adjust amounts as necessary. The magnitude of claims and or the adjustments to such claims may be material. Nothing herein constitutes an admission or waiver of any rights. The following table summarizes the components of “Liabilities subject to compromise” included on our Consolidated Balance Sheet as of September 30, 2016: September 30, 2016 Accounts payable and accrued liabilities $ 9,740 Accrued payroll and benefits payable 5,133 Revenue distribution payable 4,690 Senior Notes and associated accrued interest 1,267,265 Liabilities subject to compromise $ 1,286,828 Reorganization Items. We use this category to reflect, where applicable, post-petition revenues, expenses, gains and losses that are direct and incremental as a result of the reorganization of the business. We have incurred and will continue to incur significant costs associated with the reorganization. The amount of these costs, which are being expensed as incurred, are expected to significantly affect our results of operations. Reorganization items for the three and nine months ended September 30, 2016, are as follows: Three months ended Nine months ended September 30, 2016 Professional fees $ 4,268 $ 9,623 Claims for non-performance of executory contract 1,236 1,236 Total reorganization items $ 5,504 $ 10,859

Supplemental disclosures to the

Supplemental disclosures to the consolidated statements of cash flows	9 Months Ended
	Sep. 30, 2016
Supplemental Cash Flow Elements [Abstract]
Supplemental disclosures to the consolidated statements of cash flows	Note 3: Supplemental disclosures to the consolidated statements of cash flows Supplemental disclosures to the consolidated statements of cash flows are presented below: Nine months ended September 30, 2016 2015 Net cash provided by operating activities included: Cash payments for interest $ 19,899 $ 77,437 Interest capitalized (1,741 ) (8,115 ) Cash payments for interest, net of amounts capitalized $ 18,158 $ 69,322 Cash payments for income taxes $ 250 $ 639 Cash payments for reorganization items $ 4,255 $ — Non-cash financing activities included: Repayment of Credit Facility with proceeds from early termination of derivative contracts (See Note 4) $ 103,560 $ — Non-cash investing activities included: Asset retirement obligation additions and revisions $ 4,015 $ 3,637 Change in accrued oil and gas capital expenditures $ (22,543 ) $ (116,237 )

Debt

Debt	9 Months Ended
	Sep. 30, 2016
Debt Disclosure [Abstract]
Debt	Note 4: Debt As of the dates indicated, debt consisted of the following: September 30, 2016 December 31, 2015 9.875% Senior Notes due 2020, net of discount of $0 and $4,185, respectively (1) $ — $ 293,815 8.25% Senior Notes due 2021 (1) — 384,045 7.625% Senior Notes due 2022, including premium of $0 and $4,939, respectively (1) — 530,849 Credit Facility (2) 444,440 367,000 Real estate mortgage notes, principal and interest payable monthly, bearing interest at rates ranging from 3.16% to 5.46%, due August 2021 through December 2028; collateralized by real property (2) 9,735 10,182 Installment notes payable, principal and interest payable monthly, bearing interest at rates ranging from 2.85% to 5.00%, due October 2016 through February 2018; collateralized by automobiles, machinery and equipment (2) 683 1,799 Capital lease obligations (2) 17,577 19,437 Total debt, net 472,435 1,607,127 Less current portion 472,435 1,607,127 Total long-term debt, net $ — $ — (1) These unsecured obligations have been classified as “Liabilities subject to compromise” as of September 30, 2016. (2) These secured obligations have not been classified as “Liabilities subject to compromise” as we believe the values of the underlying assets provide sufficient collateral to satisfy such obligations. We are currently in default on all our indebtedness. The defaults stem from, among others, our commencement of the Chapter 11 Cases, direct defaults as a result of nonpayment of interest, violations of financial covenants and the inclusion of a going concern explanatory paragraph in the audit opinion of our annual financial statements. Moreover, due to our commencement of the Chapter 11 Cases, all of our indebtedness has been accelerated by operation of law. Senior Notes The Senior Notes are our senior unsecured obligations and rank equally in right of payment with all our existing and future senior debt, and rank senior to all of our existing and future subordinated debt. Pursuant to accounting guidance while in bankruptcy, our Senior Notes and the associated accrued interest have been classified as “Liabilities subject to compromise” on our consolidated balance sheets as of September 30, 2016. We will not accrue interest expense on our Senior Notes during the pendency of the Chapter 11 Cases as we do not expect to pay such interest. As a result, reported interest expense is $25,303 and $39,641 lower than contractual interest for the three and nine month periods ending September 30, 2016. In March 2016 we wrote off the remaining unamortized issuance costs, premium and discount related to our Senior Notes for a net charge of $16,970. These deferred items are typically amortized over the life of the corresponding bond. However, as a result of not paying the interest due on our 2021 Senior Notes by the end of our 30-day grace period on March 31, 2016, as discussed in “Note 2—Chapter 11 filing,” we triggered an Event of Default on our Senior Notes. While uncured, the Event of Default effectively allows the lender to demand immediate repayment, thus shortening the life of our Senior Notes to the current period. As a result, we wrote off the remaining balance of unamortized issuance costs, premium and discount on March 31, 2016, as follows: Non-cash expense for write-off of debt issuance costs on Senior Notes $ 17,756 Non-cash expense for write-off of debt discount costs on Senior Notes 4,014 Non-cash gain for write-off of debt premium on Senior Notes (4,800 ) Total $ 16,970 Credit Facility In April 2010, we entered into an Eighth Restated Credit Agreement (our “Credit Facility”), which is collateralized by our oil and natural gas properties and, as amended, matures on November 1, 2017. During the nine months ended September 30, 2016, we had additional borrowings of $181,000 and repayments of $103,560 on our Credit Facility. As discussed in “Note 5—Derivative instruments,” our repayment of $103,560 was effectuated by directly offsetting proceeds payable to us from the termination of our derivative contracts against outstanding borrowings under the Credit Facility during the third quarter of 2016. The ability to offset was possible as the previous counterparties to our derivative contracts are also Lenders. As of September 30, 2016, the weighted average interest rate was 5.0% on outstanding borrowings under Credit Facility. This rate represents the Alternate Base Rate (as defined under the Credit Facility) plus the applicable margin. The Company has not recorded the additional 2.0% default margin interest as the Lenders have agreed to waive that amount upon our exit from bankruptcy pursuant to a non-binding agreement between the Lenders and the Ad Hoc Committee. Availability under our Credit Facility was subject to a borrowing base which is set by the banks semiannually on May 1 and November 1 of each year. In addition, the lenders may request a borrowing base redetermination once between each scheduled redetermination and in the event of early termination of our derivative contracts. We are currently in negotiations, as part of our reorganization, regarding the structure of our exit financing upon emergence from bankruptcy where we believe such financing will include a revolving credit facility subject to a borrowing base. Subject to certain exceptions, under the Bankruptcy Code, the commencement of the Chapter 11 Cases automatically enjoined, or stayed, the continuation of most judicial or administrative proceedings or the filing of other actions against us or our property to recover, collect or secure a claim arising prior to the Petition Date. Creditors are stayed from taking any actions against us as a result of debt defaults, subject to certain limited exceptions permitted by the Bankruptcy Code. There can be no assurances that the agent and lenders will consensually agree to a restructuring of the Credit Facility. Any proposed non-consensual restructuring of the Credit Facility could result in substantial delay in emergence from bankruptcy and there can be no assurances that the Bankruptcy Court would approve such proposed non-consensual restructuring. During the Chapter 11 Cases, we expect to remain current on our interest payments under the Credit Facility to the extent required by order of the Bankruptcy Court. Capital Leases During 2013, we entered into lease financing agreements with U.S. Bank National Association for $24,500 through the sale and subsequent leaseback of existing compressors owned by us. The carrying value of these compressors is included in our oil and natural gas full cost pool. The lease financing obligations are for 84 -month terms and include the option to purchase the equipment for a specified price at 72 months as well as an option to purchase the equipment at the end of the lease term for its then-current fair market value. Lease payments related to the equipment are recognized as principal and interest expense based on a weighted average implicit interest rate of 3.8%. Minimum lease payments are approximately $3,181 annually. As discussed previously, our debt defaults and the commencement of the Chapter 11 Cases are events of default under our capital leases.

Derivative instruments

Derivative instruments	9 Months Ended
	Sep. 30, 2016
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Derivative instruments	Note 5: Derivative instruments Overview Our results of operations, financial condition and capital resources are highly dependent upon the prevailing market prices of, and demand for, oil, natural gas and natural gas liquids. These commodity prices are subject to wide fluctuations and market uncertainties. To mitigate a portion of this exposure, we previously entered into various types of derivative instruments, including commodity price swaps, enhanced price swaps, collars, put options, and basis protection swaps. We also previously entered into crude oil derivative contracts to hedge a portion of our natural gas liquids production. Due to defaults under the master agreements governing our derivative contracts, our outstanding derivative positions were terminated in May 2016 and we have no outstanding derivative contracts as of September 30, 2016. As discussed in “Note 6—Fair value measurements” all the counterparties to our derivative transactions are also financial institutions within the lender group under our Credit Facility. The derivative master agreements with these counterparties generally specify that a default under any of our indebtedness, as well as any bankruptcy filing, is an event of default which may result in early termination of the derivative contracts. Proceeds from the early terminations, inclusive of amounts receivable at the time of termination for previous settlements, totaled $119,303. Of this amount, in the third quarter of 2016, $103,560 was utilized to offset outstanding borrowings under our Credit Facility and the remainder was remitted to the Company. While we are in default on our indebtedness and have a bankruptcy filing, we will no longer be able to represent that we can comply with the credit default or bankruptcy covenants under any prospective derivative master agreements and thus may not be able to enter into new hedging transactions. We are currently negotiating with the Lenders, most of which were previously counterparties to our derivative contracts, regarding the resumption of hedging activity prior to our potential emergence from bankruptcy. However, there can be no assurance that we will be able to enter into new derivative transactions on terms that are acceptable to us. Effect of derivative instruments on the consolidated balance sheets All derivative financial instruments are recorded on the balance sheet at fair value. See “Note 6—Fair value measurements” for additional information regarding fair value measurements. The estimated fair values of derivative instruments are provided below. The carrying amounts of these instruments are equal to the estimated fair values. As of December 31, 2015 Assets Liabilities Net value Natural gas derivative contracts $ 41,328 $ (1,158 ) $ 40,170 Crude oil derivative contracts 123,068 — 123,068 Total derivative instruments 164,396 (1,158 ) 163,238 Less: Netting adjustments (1) 1,158 (1,158 ) — Derivative instruments - current 143,737 — 143,737 Derivative instruments - long-term $ 19,501 $ — $ 19,501 (1) Amounts represent the impact of master netting agreements that allow us to net settle positive and negative positions with the same counterparty. Positive and negative positions with counterparties are netted only to the extent that they relate to the same current versus noncurrent classification on the balance sheet. Effect of derivative instruments on the consolidated statements of operations We do not apply hedge accounting to any of our derivative instruments. As a result, all gains and losses associated with our derivative contracts are recognized immediately as non-hedge derivative gains in the consolidated statements of operations. Non-hedge derivative gains in the consolidated statements of operations are comprised of the following: Three months ended Nine months ended September 30, September 30, 2016 2015 2016 2015 Change in fair value of commodity price derivatives $ — $ 30,941 $ (163,238 ) $ (67,883 ) Settlement gains on commodity price derivatives — 54,474 62,626 157,754 Settlement gains on early terminations of commodity price derivatives — — 91,144 15,395 Total non-hedge derivative gains (losses) $ — $ 85,415 $ (9,468 ) $ 105,266

Fair value measurements

Fair value measurements	9 Months Ended
	Sep. 30, 2016
Fair Value Disclosures [Abstract]
Fair value measurements	Note 6: Fair value measurements Fair value is defined by the FASB 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. Where available, fair value is based on observable market prices or parameters or derived from such prices or parameters. Where observable prices or inputs are not available, valuation models are applied. These valuation techniques involve some level of management estimation and judgment, the degree of which is dependent on the price transparency for the instruments or market and the instruments’ complexity. Fair value measurements are categorized according to the fair value hierarchy defined by the FASB. The hierarchical levels are based upon the level of judgment associated with the inputs used to measure the fair value of the assets and liabilities as follows: • Level 1 inputs are unadjusted quoted prices in active markets for identical assets or liabilities at the measurement date. • Level 2 inputs include quoted prices for identical or similar instruments in markets that are not active and inputs other than quoted prices that are observable for the asset or liability. • Level 3 inputs are unobservable inputs for the asset or liability, and include situations where there is little, if any, market activity for the asset or liability. In certain cases, the inputs used to measure fair value may fall into different levels of the fair value hierarchy. In such cases, the asset or liability is categorized based on the lowest level input that is significant to the fair value measurement in its entirety. Our assessment of the significance of a particular input to the fair value measurement in its entirety requires judgment, and may affect the placement of assets and liabilities within the levels of the fair value hierarchy. Recurring fair value measurements Our financial instruments recorded at fair value on a recurring basis consist of commodity derivative contracts (see “Note 5—Derivative instruments”). Our derivative contracts classified as Level 2 consisted of commodity price swaps and basis protection swaps, which are valued using an income approach. Future cash flows from the derivatives are estimated based on the difference between the fixed contract price and the underlying published forward market price, and are discounted at the LIBOR swap rate. Our derivative contracts classified as Level 3 consisted of three-way collars, enhanced swaps, and purchased puts. The fair value of these contracts is developed by a third-party pricing service using a proprietary valuation model, which we believe incorporates the assumptions that market participants would have made at the end of each period. Observable inputs include contractual terms, published forward pricing curves, and yield curves. Significant unobservable inputs are implied volatilities. Significant increases (decreases) in implied volatilities in isolation would result in a significantly higher (lower) fair value measurement. We review these valuations and the changes in the fair value measurements for reasonableness. All derivative instruments are recorded at fair value and include a measure of our own nonperformance risk for derivative liabilities or that of our counterparties for derivative assets. As discussed in “Note 5—Derivative instruments,” due to defaults under the master agreements governing our derivative contracts, all our outstanding derivative positions were terminated in May 2016 and we have no outstanding derivative contracts as of September 30, 2016. The fair value hierarchy for our financial assets and liabilities is shown by the following table: As of December 31, 2015 Derivative assets Derivative liabilities Net assets (liabilities) Significant other observable inputs (Level 2) $ 41,328 $ (1,158 ) $ 40,170 Significant unobservable inputs (Level 3) 123,068 — 123,068 Netting adjustments (1) (1,158 ) 1,158 — $ 163,238 $ — $ 163,238 (1) Amounts represent the impact of master netting agreements that allow us to net settle positive and negative positions with the same counterparty. Positive and negative positions with counterparties are netted on the balance sheet only to the extent that they relate to the same current versus noncurrent classification. Changes in the fair value of our derivative instruments classified as Level 3 in the fair value hierarchy during the nine months ended September 30, 2016 and 2015 were: Nine months ended September 30, Net derivative assets (liabilities) 2016 2015 Beginning balance $ 123,068 $ 195,167 Realized and unrealized (losses) gains included in non-hedge derivative gains (9,216 ) 4,660 Settlements received (113,852 ) (62,127 ) Ending balance $ — $ 137,700 Losses relating to instruments still held at the reporting date included in non-hedge derivative gains for the period $ — $ 45,835 Nonrecurring fair value measurements Asset retirement obligations. Additions to the asset and liability associated with our asset retirement obligations are measured at fair value on a nonrecurring basis. Our asset retirement obligations consist of the estimated present value of future costs to plug and abandon or otherwise dispose of our oil and natural gas properties and related facilities. Significant inputs used in determining such obligations include estimates of plugging and abandonment costs, inflation rates, discount rates, and well life, all of which are Level 3 inputs according to the fair value hierarchy. The estimated future costs to dispose of properties added during the first nine months of 2016 and 2015 were escalated using an annual inflation rate of 2.42% and 2.91%, respectively, and discounted using our weighted average credit-adjusted risk-free interest rate of 20.00% and 13.45%, respectively. These estimates may change based upon future inflation rates and changes in statutory remediation rules. See “Note 7—Asset retirement obligations” for additional information regarding our asset retirement obligations. Fair value of other financial instruments Our significant financial instruments, other than derivatives, consist primarily of cash and cash equivalents, accounts receivable, accounts payable, and debt. We believe the carrying values of cash and cash equivalents, accounts receivable, and accounts payable approximate fair values due to the short-term maturities of these instruments. The carrying value and estimated fair value of our debt at September 30, 2016, and December 31, 2015, were as follows: September 30, 2016 December 31, 2015 Level 2 Carrying value Estimated fair value Carrying value Estimated fair value 9.875% Senior Notes due 2020 $ 298,000 $ 203,385 $ 293,815 $ 75,750 8.25% Senior Notes due 2021 384,045 248,746 384,045 96,956 7.625% Senior Notes due 2022 525,910 352,360 530,849 120,478 Other secured debt 10,418 10,418 11,981 11,981 The fair value of our Senior Notes was estimated based on quoted market prices. We have not disclosed the fair value of outstanding amounts under our Credit Facility as it is not practicable to obtain a reasonable estimate of such value while the Company is in bankruptcy and the terms of the facility are being negotiated in conjunction with its reorganization. Counterparty credit risk Our derivative contracts are executed with institutions, or affiliates of institutions, that are parties to our Credit Facility at the time of execution, and we believe the credit risks associated with all of these institutions are acceptable. We do not require collateral or other security from counterparties to support derivative instruments. Master agreements are in place with each of our derivative counterparties which provide for net settlement in the event of default or termination of the contracts under each respective agreement. As a result of the netting provisions, our maximum amount of loss under derivative transactions due to credit risk is limited to the net amounts due from the counterparties under the derivatives. Our loss is further limited as any amounts due from a defaulting counterparty that is a Lender, or an affiliate of a Lender, under our senior secured revolving credit facility can be offset against amounts owed to such counterparty Lender. As of December 31, 2015, the counterparties to our open derivative contracts consisted of seven financial institutions, of which all were subject to our rights of offset under our Credit Facility. The following table summarizes our derivative assets and liabilities which are offset in the consolidated balance sheets under our master netting agreements. It also reflects the amounts outstanding under our senior secured revolving credit facility that are available to offset our net derivative assets due from counterparties that are Lenders. Offset in the consolidated balance sheets Gross amounts not offset in the consolidated balance sheets Gross assets (liabilities) Offsetting assets (liabilities) Net assets (liabilities) Derivatives(1) Amounts outstanding under senior secured revolving credit facility Net amount As of December 31, 2015 Derivative assets $ 164,396 $ (1,158 ) $ 163,238 $ — $ (103,618 ) $ 59,620 Derivative liabilities (1,158 ) 1,158 — — — — $ 163,238 $ — $ 163,238 $ — $ (103,618 ) $ 59,620 (1) Since positive and negative positions with a counterparty are netted on the balance sheet only to the extent that they relate to the same current versus noncurrent classification, these represent remaining amounts that could have been offset under our master netting agreements. We did not post additional collateral under any of these contracts as all of our counterparties are secured by the collateral under our senior secured revolving credit facility. Payment on our derivative contracts would have been accelerated in the event of a default on our senior secured revolving credit facility. The aggregate fair value of our derivative liabilities subject to acceleration in the event of default was $1,158 at December 31, 2015. As discussed previously, the defaults of our derivative master agreements resulted in the termination of all our contracts in May 2016 and resulted in amounts payable to us by our counterparties.

Asset retirement obligations

Asset retirement obligations	9 Months Ended
	Sep. 30, 2016
Asset Retirement Obligation Disclosure [Abstract]
Asset retirement obligations	Note 7: Asset retirement obligations The following table provides a summary of our asset retirement obligation activity during the nine months ended September 30, 2016 and 2015. Nine months ended September 30, 2016 2015 Beginning balance $ 48,612 $ 47,424 Liabilities incurred in current period 2,554 1,852 Liabilities settled and disposed in current period (1,380 ) (4,886 ) Revisions in estimated cash flows 1,461 1,785 Accretion expense 2,859 2,727 Ending balance 54,106 48,902 Less current portion included in accounts payable and accrued liabilities 3,895 2,384 $ 50,211 $ 46,518 See “Note 6—Fair value measurements” for additional information regarding fair value assumptions associated with our asset retirement obligations.

Deferred compensation

Deferred compensation	9 Months Ended
	Sep. 30, 2016
Share Based Compensation [Abstract]
Deferred compensation	Note 8: Deferred compensation Phantom Stock Plan and Restricted Stock Unit Plan Effective January 1, 2004, we implemented a Phantom Unit Plan, which was revised on December 31, 2008 as the Second Amended and Restated Phantom Stock Plan (the “Phantom Plan”), to provide deferred compensation to certain key employees (the “Participants”). Under the Phantom Plan, awards vest at the end of five years, but may also vest on a pro-rata basis following a Participant’s termination of employment with us due to death, disability, retirement or termination by us without cause. Also, phantom stock will vest if a change of control event occurs. Phantom shares are cash-settled within 120 days of the vesting date. Effective March 1, 2012, we implemented a Non-Officer Restricted Stock Unit Plan (the “RSU Plan”) to create incentives to motivate Participants to put forth maximum effort toward the success and growth of the Company and to enable us to attract and retain experienced individuals who by their position, ability and diligence are able to make important contributions to the Company’s success. The RSU Plan is intended to replace the Phantom Plan. There are no outstanding Phantom Plan awards remaining and we do not expect to make any further awards under the Phantom Plan. Under the RSU Plan, restricted stock units may be awarded to Participants in an aggregate amount of up to 2% of the fair market value of the Company. Under the RSU Plan, awards generally vest in equal annual increments over a three-year period. RSU awards may also vest following a Participant’s termination of employment in combination with the occurrence of a change of control event, as specified in the RSU Plan. RSU awards are cash-settled, generally within 120 days of the vesting date. A summary of our phantom stock and RSU activity during the nine months ended September 30, 2016, is presented in the following table: Phantom Plan RSU Plan Weighted average grant date fair value Phantom shares Vest date fair value Weighted average grant date fair value Restricted Stock Units Vest date fair value ($ per share) ($ per share) Unvested and outstanding at January 1, 2016 $ 18.62 10,619 $ 10.53 269,886 Granted $ — — $ — — Vested $ 18.39 (9,729 ) $ — $ 9.01 (140,818 ) $ — Forfeited $ 21.09 (890 ) $ 8.24 (28,769 ) Unvested and outstanding at September 30, 2016 $ — — $ 7.20 100,299 Due to the severe decline in commodity pricing, which has resulted in a steep decline in our estimated proved reserves, the estimated fair value per RSU as of September 30, 2016, is $0.00. The weighted average period until all remaining RSUs vest is 0.6 years. 2015 Cash Incentive Plan We adopted the Long-Term Cash Incentive Plan (the “2015 Cash LTIP”) on August 7, 2015. The 2015 Cash LTIP provides additional cash compensation to certain employees of the Company in the form of awards that generally vest in equal annual increments over a four -year period. Since the awards do not vary according to the value of the Company’s equity, the awards are not considered “stock-based compensation” under accounting guidance. We accrue for the cost of each annual increment over the period service is required to vest. A summary of compensation expense for the 2015 Cash LTIP is presented below: Three months ended Nine months ended September 30, September 30, 2016 2015 2016 2015 2015 Cash LTIP expense $ 281 $ 187 $ 849 $ 187 2010 Equity Incentive Plan We adopted the Chaparral Energy, Inc. 2010 Equity Incentive Plan (the “2010 Plan”) on April 12, 2010. The 2010 Plan reserves a total of 86,301 shares of our class A common stock for awards issued under the 2010 Plan. All of our or our affiliates’ employees, officers, directors, and consultants, as defined in the 2010 Plan, are eligible to participate in the 2010 Plan. The awards granted under the 2010 Plan consist of shares that are subject to service vesting conditions (the “Time Vested” awards) and shares that are subject to market and performance vested conditions (the “Performance Vested” awards). The Time Vested awards vest in equal annual installments over the five -year vesting period, but may also vest on an accelerated basis in the event of a transaction whereby CCMP Capital Investors II (AV-2), L.P., CCMP Energy I LTD., and CCMP Capital Investors (Cayman) II, L.P. (collectively “CCMP”) receive cash upon the sale of its class E common stock (a “Transaction” as defined in the restricted stock agreements). The Performance Vested awards vest in the event of a Transaction that achieves certain market targets as defined in the 2010 Plan. Any shares of Performance Vested awards not vested on a Separation Date (as defined in the 2010 Plan) will be forfeited as of the Separation Date. Our 2010 Plan allows participants to elect, upon vesting of their Time Vested awards, to have us withhold shares having a fair market value greater than the minimum statutory withholding amounts for income and payroll taxes that would be due with respect to such vested shares. As a result of this provision, the Time Vested awards are classified as liability awards under accounting guidance and remeasured to fair value at the end of each reporting period. The Performance Vested awards are classified as equity awards and are not remeasured to fair value at the end of each reporting period subsequent to grant date. We have previously modified the vesting conditions of awards granted under the 2010 Plan. Please see “Note 11—Stock-based compensation” in Item 8. Financial Statement and Supplementary Data of our Annual Report on Form 10-K for the year ended December 31, 2015, for a discussion of the modifications. A summary of our restricted stock activity during the nine months ended September 30, 2016, is presented below: Time Vested Performance Vested Weighted average grant date fair value Restricted shares Vest date fair value Weighted average grant date fair value Restricted shares ($ per share) ($ per share) Unvested and outstanding at January 1, 2016 $ 795.13 13,979 $ 278.97 28,448 Granted $ — — $ — — Vested $ 798.85 (5,279 ) $ 93 $ — — Forfeited $ 810.01 (1,773 ) $ 293.62 (6,374 ) Unvested and outstanding at September 30, 2016 $ 788.48 6,927 $ 274.74 22,074 During the nine months ended September 30, 2016 and 2015, we repurchased and canceled 2,597 and 5,678 vested shares, respectively. As of result of our bankruptcy, the estimated fair value of our Time Vested restricted awards was $0.00 per share, resulting in an aggregate intrinsic value of all outstanding unvested Time Vested restricted shares of $0 as of September 30, 2016. Furthermore, during the third quarter of 2016, we recorded a cumulative catch up adjustment of $5,985 to reverse the aggregate compensation cost associated with our Performance Vested in order to reflect a decrease in the probability that requisite service would be achieved for these awards. We anticipate that our reorganization under Chapter 11 of the Bankruptcy Code will ultimately result in the cancellation of all outstanding restricted shares and therefore we do not expect any future repurchases of these shares. Stock-based compensation cost Compensation cost is calculated net of forfeitures, which are estimated based on our historical and expected turnover rates. If our actual forfeiture rate is materially different from our estimate, the stock-based compensation cost could be different from what we have recorded in the current period. A portion of stock-based compensation cost associated with employees involved in our acquisition, exploration, and development activities has been capitalized as part of our oil and natural gas properties. The remaining cost is reflected in lease operating and general and administrative expenses in the consolidated statements of operations. We recognized stock-based compensation expense as follows for the periods indicated: Three months ended Nine months ended September 30, September 30, 2016 2015 2016 2015 Stock-based compensation cost (credit) $ (5,705 ) $ (581 ) $ (6,220 ) $ (143 ) Less: stock-based compensation cost capitalized 1,167 (49 ) 965 (352 ) Stock-based compensation expense (credit) $ (4,538 ) $ (630 ) $ (5,255 ) $ (495 ) Payments for stock-based compensation $ — $ 333 $ 49 $ 3,977 Our stock-based compensation expense for periods disclosed includes credits due to forfeitures from our workforce reductions in January 2016 and February 2015, lower valuations of our liability-based awards and the cumulative adjustment on our Performance Vested awards discussed previously. As of September 30, 2016, and December 31, 2015, accrued payroll and benefits payable included $0 and $81, respectively, for stock-based compensation costs expected to be settled within the next twelve months. Unrecognized compensation cost is approximately $244 all of which relates to our Time Vested awards.

Commitments and contingencies

Commitments and contingencies	9 Months Ended
	Sep. 30, 2016
Commitments And Contingencies Disclosure [Abstract]
Commitments and contingencies	Note 9: Commitments and contingencies Standby letters of credit (“Letters”) available under our Credit Facility are used in lieu of surety bonds with various organizations for liabilities relating to the operation of oil and natural gas properties. We had Letters outstanding totaling $828 as of September 30, 2016, and December 31, 2015. When amounts under the Letters are paid by the lenders, interest accrues on the amount paid at the same interest rate applicable to borrowings under the Credit Facility. No amounts were paid by the lenders under the Letters; therefore, we paid no interest on the Letters during the nine months ended September 30, 2016, or 2015. Litigation and Claims Commencement of the Chapter 11 Cases automatically stayed many of the proceedings and actions against us noted below as well as other claims and actions that were or could have been brought prior to May 9, 2016, In connection with the proofs of claim asserted during bankruptcy from the proceedings or actions below, we are unable to estimate the amounts that will be allowed by the Bankruptcy Court due to the complexity and number of legal and factual issues presented by the matters and uncertainties with respect to, amongst other things, the nature of the claims and defenses, the potential size of the class, the scope and types of the properties and agreements involved, and the ultimate potential outcomes of the matters. As a result, no reserves have been established within our liabilities subject to compromise in connection with the proceedings and actions described below. Naylor Farms, Inc., individually and as class representative on behalf of all similarly situated persons v. Chaparral Energy, L.L.C. On June 7, 2011, an alleged class action was filed against us in the United States District Court for the Western District of Oklahoma (“Naylor Farms Case”) alleging that we improperly deducted post-production costs from royalties paid to plaintiffs and other royalty interest owners as categorized in the petition from crude oil and natural gas wells located in Oklahoma. The purported class includes non-governmental royalty interest owners in oil and natural gas wells we operate in Oklahoma. The plaintiffs have alleged a number of claims, including breach of contract, fraud, breach of fiduciary duty, unjust enrichment, and other claims and seek termination of leases, recovery of compensatory damages, interest, punitive damages and attorney fees on behalf of the alleged class. We have responded to the Naylor Farms petition, denied the allegations and raised arguments and defenses. Plaintiffs filed a motion for class certification in October 2015. In addition, the plaintiffs filed a motion for summary judgment asking the court to determine as a matter of law that natural gas is not marketable until it is in the condition and location to enter an interstate pipeline. Responsive briefs to both motions were filed in the fourth quarter of 2015. The court has not ruled on the motions, and no hearing has been scheduled. On May 20, 2016, we filed a Notice of Suggestion of Bankruptcy, informing the court that we had filed voluntary petitions for relief under Chapter 11 of the United States Bankruptcy Code. In response, on May 23, 2016, the court issued an order administratively closing the case, subject to reopening depending on the disposition of the bankruptcy proceedings. On July 22, 2016, attorneys for the putative class filed a motion in the Bankruptcy Court asking the court to lift the automatic stay and allow the case to proceed in the United States District Court for the Western District of Oklahoma. We did not object to lifting the automatic stay with regard to this case for the limited purpose of allowing the District Court to rule on the pending motion for class certification, and the class certification issue is under consideration by the trial judge in the United States District Court for the Western District of Oklahoma. The plaintiffs’ motion to lift the automatic stay regarding the pending motion for summary judgment is pending in the Bankruptcy Court and is scheduled for a hearing on November 22, 2016. The plaintiffs have indicated, if the class is certified, they seek damages in excess of $5,000 which may increase with the passage of time, a majority of which would be comprised of interest. In addition to filing claims on behalf of the named plaintiffs and associated parties, plaintiffs’ attorneys filed a proof of claim on behalf of the putative class claiming in excess of $150,000 in our Chapter 11 Cases. We dispute the plaintiffs’ allegations, dispute the case meets the requirements for class certification, and anticipate objecting to the claims. Amanda Dodson, individually and as class representative on behalf of all similarly situated persons v. Chaparral Energy, L.L.C. On May 10, 2013, Amanda Dodson, filed a complaint against us in the District Court of Mayes County, Oklahoma, (“Dodson Case”) with an allegation similar to those asserted in the Naylor Farms case related to post-production deductions, and include claims for breach of contract, fraud, breach of fiduciary duty, unjust enrichment, and other claims and seek termination of leases, recovery of compensatory damages, interest, punitive damages and attorney fees on behalf of the alleged class. The alleged class includes non-governmental royalty interest owners in oil and natural gas wells we operate in Oklahoma. We have responded to the Dodson petition, denied the allegations and raised a number of affirmative defenses. At the time we filed our Bankruptcy Petitions, a class had not been certified and discovery had not yet commenced. As the plaintiffs in the Dodson case did not file proofs of claim either for the putative class or the putative class representative, we anticipate any liability related to this claim will be discharged. Martha Donelson and John Friend, on behalf of themselves and on behalf of all similarly situated persons v. Chaparral Energy, L.L.C. On August 11, 2014, an alleged class action was filed against us, as well as several other operators in Osage County, in the United States District Court for the Northern District of Oklahoma, alleging claims on behalf of the named plaintiffs and all similarly situated Osage County land owners and surface lessees. The plaintiffs challenged leases and drilling permits approved by the Bureau of Indian Affairs without the environmental studies required under the National Environmental Protection (NEPA). The plaintiffs assert claims seeking recovery for trespass, nuisance, negligence and unjust enrichment. Relief sought includes declaring oil and natural gas leases and drilling permits obtained in Osage County without a prior NEPA study void , removing us from all properties owned by the class members, disgorgement of profits, and compensatory and punitive damages. On March 31, 2016, the Court dismissed the case against the federal agencies named as defendants, and therefore against all defendants, as an improper challenge under NEPA and the Administrative Procedures Act. On April 29, 2016, the plaintiffs filed a motion to alter or amend the court’s opinion and vacate the judgment, arguing the court does have jurisdiction to hear the claims and dismissal of the federal defendants does not require dismissal of the oil company defendants. The plaintiffs also filed a motion to file an amended complaint to cure the deficiencies which the court found in the dismissed complaint. Several defendants have filed briefs objecting to plaintiffs’ motions. On May 20, 2016, the Company filed a Notice of Suggestion of Bankruptcy, informing the court that we had filed voluntary petitions for relief under Chapter 11 of the United States Bankruptcy Code, and has not responded to the plaintiffs’ motions. The court has not yet ruled. As the plaintiffs in the Donelson case did not file proofs of claim either for the putative class or the putative class representatives, we anticipate any monetary liability related to this claim will be discharged. We dispute plaintiffs’ allegations and dispute that the case meets the requirements for a class action. Lisa West and Stormy Hopson, individually and as class representatives on behalf of all similarly situated persons v. Chaparral Energy, L.L.C. On February 18, 2016, an alleged class action was filed against us, as well as several other operators in the District Court of Pottawatomie County, State of Oklahoma (“West Case”), alleging claims on behalf of named plaintiffs and all similarly situated persons having an insurable real property interest in Cleveland, Lincoln, McClain, Okfuskee, Oklahoma, Pontotoc, Pottawatomie and Seminole Counties, Oklahoma (the “Class Area”). The plaintiffs allege the oil and gas operations conducted by us and the other defendants have induced or triggered earthquakes in the Class Area. The plaintiffs are asking the court to require the defendants to reimburse plaintiffs and class members for earthquake insurance premiums from 2011 through a future date defined as the time at which the court determines there is no longer a risk that our activities induce or trigger earthquakes, as well as attorney fees and costs and other relief. The plaintiffs have not asked for damages related to actual property damage which may have occurred. We have responded to the petition, denied the allegations and raised a number of affirmative defenses. At this time, a class has not been certified and discovery has not yet commenced. On March 18, 2016, the case was removed to the United States District Court for the Western District of Oklahoma under the Class Action Fairness Act (“CAFA”). On May 20, 2016, we filed a Notice of Suggestion of Bankruptcy, informing the court that we had filed voluntary petitions for relief under Chapter 11 of the United States Bankruptcy Code. On October 14, 2016, the plaintiffs filed an Amended Complaint adding additional defendants and increasing the Class Area to 25 Central Oklahoma counties. Although we are named as a defendant, the Amended Complaint expressly limits its claims against us to those asserted in the original petition unless and until the automatic stay is lifted. Plaintiffs’ attorneys filed a proof of claim on behalf of the putative class claiming in excess of $75,000 in our Chapter 11 Cases. We dispute the plaintiffs’ claims, dispute that the case meets the requirements for a class action, dispute the remedies requested are available under Oklahoma law, and are vigorously defending the case. We are involved in various other legal proceedings including, but not limited to, commercial disputes, claims from royalty and surface owners, property damage claims, personal injury claims, employment claims, and other matters which arise in the ordinary course of business. In addition, other proofs of claim have been filed in our bankruptcy case which we anticipate repudiating. While the outcome of these legal proceedings cannot be predicted with certainty, we do not expect any of them individually to have a material effect on our financial condition, results of operations or cash flows. We have numerous contractual commitments in the ordinary course of business including debt service requirements, operating leases, capital leases and purchase obligations. Our operating leases primarily relate to CO 2 2 2

Nature of operations and summ15

Nature of operations and summary of significant accounting policies (Policies)	9 Months Ended
	Sep. 30, 2016
Accounting Policies [Abstract]
Nature of operations	Nature of operations Chaparral Energy, Inc. and its subsidiaries, (collectively, “we”, “our”, “us”, or the “Company”) are involved in the acquisition, exploration, development, production and operation of oil and natural gas properties. Our properties are located primarily in Oklahoma and Texas. As discussed in “Note 2—Chapter 11 filing,” we are currently operating our business as debtor in possession in accordance with the applicable provisions of the Bankruptcy Code.
Interim financial statements	Interim financial statements The accompanying unaudited consolidated interim financial statements of the Company have been prepared in accordance with the rules and regulations of the SEC and do not include all of the financial information and disclosures required by accounting principles generally accepted in the United States of America (“GAAP”) 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, 2015. The financial information as of September 30, 2016, and for the three and nine months ended September 30, 2016, and 2015, respectively, is unaudited. The financial information as of December 31, 2015, has been derived from the audited financial statements contained in our Annual Report on Form 10-K for the year ended December 31, 2015. In management’s opinion, such information contains all adjustments considered necessary for a fair presentation of the results of the interim periods. The results of operations for the three and nine months ended September 30, 2016, are not necessarily indicative of the results of operations that will be realized for the year ended December 31, 2016. Basis of Accounting. As noted above, the uncertainty regarding our ability to meet our debt obligations and the resultant filing of the Chapter 11 Cases raises substantial doubt about our ability to continue as a going concern. The accompanying consolidated financial statements have been prepared on a going concern basis of accounting, which contemplates continuity of operations, realization of assets, and satisfaction of liabilities and commitments in the normal course of business. The accompanying consolidated financial statements do not purport to reflect or provide for the consequences of our Chapter 11 Cases, other than as set forth under “Liabilities subject to compromise” and “Reorganization items” on the accompanying consolidated financial statements. In particular, the financial statements do not purport to show (i) as to assets, their realizable value on a liquidation basis or their availability to satisfy liabilities; (ii) as to pre-petition liabilities, the amounts that may be allowed for claims or contingencies, or the status and priority thereof; (iii) as to stockholders’ equity accounts, the effect of any changes that may be made in our capitalization; or (iv) as to operations, the effect of any changes that may be made to our business. We have accounted for the bankruptcy in accordance with Accounting Standards Codification 852, Reorganizations .
Cash and cash equivalents	Cash and cash equivalents We maintain cash and cash equivalents in bank deposit accounts and money market funds which may not be federally insured. As of September 30, 2016, cash with a recorded balance totaling $37,535 and $49,852 was held at JP Morgan Chase Bank, N.A and Arvest Bank, respectively. In addition, we also held cash equivalents in the form of treasury securities with a recorded balance of $101,095 at Arvest Wealth Management. We have not experienced any losses in such accounts and believe we are not exposed to any significant credit risk on such accounts. We are not party to any valid blocked account agreements with respect to any material amount of cash.
Accounts receivable	Accounts receivable We have receivables from joint interest owners and oil and natural gas purchasers which are generally uncollateralized. Accounts receivable consisted of the following at September 30, 2016, and December 31, 2015: September 30, December 31, 2016 2015 Joint interests $ 10,471 $ 14,149 Accrued commodity sales 26,628 21,645 Derivative settlements — 40,380 Other 4,669 3,329 Allowance for doubtful accounts (495 ) (503 ) $ 41,273 $ 79,000
Inventories	Inventories Inventories consisted of the following at September 30, 2016, and December 31, 2015: September 30, December 31, 2016 2015 Equipment inventory $ 9,066 $ 11,470 Commodities 1,355 1,698 Inventory valuation allowance (2,300 ) (839 ) $ 8,121 $ 12,329 We recorded lower of cost or market adjustments for the periods disclosed below due to depressed industry conditions which resulted in lower demand for such equipment and hence lower market prices. These adjustments are reflected in “Loss on impairment of other assets” in our consolidated statements of operations. Three months ended Nine months ended September 30, September 30, 2016 2015 2016 2015 Inventory - lower of cost or market adjustment $ 202 $ — $ 1,461 $ 7,296
Oil and natural gas properties	Oil and natural gas properties The costs of unevaluated oil and natural gas properties, which are excluded from amortization until the properties are evaluated, consisted of the following at September 30, 2016, and December 31, 2015: September 30, December 31, 2016 2015 Undeveloped acreage $ 13,864 $ 60,031 Wells and facilities in progress pending determination 3,251 6,874 Total unevaluated oil and natural gas properties excluded from amortization $ 17,115 $ 66,905 Ceiling Test. In accordance with the full cost method of accounting, the net capitalized costs of oil and natural gas properties are not to exceed their related PV-10 value, net of tax considerations, plus the cost of unproved properties not being amortized. Our estimates of oil and natural gas reserves as of September 30, 2016, were prepared using an average price for oil and natural gas on the first day of each month for the prior twelve months as required by the SEC. Due to the substantial decline of commodity prices that began in mid-2014 and which continue to remain low, the cost center ceiling exceeded the net capitalized cost of our oil and natural gas properties at the end of each quarter beginning with the second quarter of 2015 through the second quarter of 2016, resulting in ceiling test write-downs in those periods. The amount of any future impairment is generally difficult to predict, and will depend on the average oil and natural gas prices during each period, the incremental proved reserves added during each period, and additional capital spent
Impairment of long-lived assets	Impairment of long-lived assets We recorded impairment losses of $6,015 related to four drilling rigs not currently in use for the nine months ended September 30, 2015. One of the rigs was last deployed in January 2015 while the remaining three have been stacked for three to four years. The loss was recorded as a result of the deterioration in commodity prices and drilling activity whereby the value of such equipment had declined while utilizing third party equipment had become more cost effective, resulting in us impairing the value of the rigs to their estimated fair value. These losses are reflected in “Loss on impairment of other assets” in our consolidated statements of operations. Our bankruptcy filing on May 9, 2016, (see “Note 2—Chapter 11 filing) was an event that required an assessment whether the carrying amounts of our long-lived assets would be recoverable. Our evaluation indicated that no additional impairment was necessary as a direct result of the bankruptcy. In October 2016, the Company entered into an agreement for the sale of our four drilling rigs for a price of $2,000. We anticipate the sale to close in January, 2017.
Income taxes	Income taxes Although we recorded a net loss for the nine months ended September 30, 2016, we did not record any corresponding tax benefit as any deferred tax asset arising from the loss is currently not believed to be realizable and is therefore reduced by a valuation allowance. At September 30, 2016, our valuation allowance is $580,280 which reduces our net deferred tax assets to zero value as we continue to believe that it is more likely than not that we will not realize the deferred tax assets primarily related to our cumulative net operating losses. Income tax recognized for the nine months ended September 30, 2016, is a result of current Texas margin tax on gross revenues less certain deductions. See “Note 10—Income Taxes” in Item 8. Financial Statement and Supplementary Data of our Annual Report on Form 10-K for the year ended December 31, 2015, for additional information about our income taxes. As described in “Note 2—Chapter 11 filing ”, The IRC provides an annual limitation with respect to the ability of a corporation to utilize its tax attributes, as well as certain built-in-losses, against future taxable income in the event of a change in ownership. Emergence from Chapter 11 bankruptcy proceedings may result in a change in ownership for purposes of the IRC. However, the IRC provides alternatives for taxpayers in Chapter 11 bankruptcy proceedings that may or may not result in an annual limitation. We are in the process of determining which alternatives are most beneficial to us in conjunction with our ongoing negotiations with our debtholders.
Liability management	Liability management Liability management expense includes third party legal and professional service fees incurred from our activities to restructure our debt and in preparation for our bankruptcy petition. As a result of our Chapter 11 petition, such expenses, to the extent that they are incremental and directly related to our bankruptcy reorganization, are reflected in “Reorganization items” in our consolidated statements of operations.
Cost reduction initiatives	Cost reduction initiatives Cost reduction initiatives include expenses related to our efforts to reduce our capital, operating and administrative costs in response to the depressed commodity pricing environment. The expense consists of costs for one-time severance and termination benefits in connection with our reductions in force and third party legal and professional services we have engaged to assist in our cost savings initiatives as follows: Three months ended Nine months ended September 30, September 30, 2016 2015 2016 2015 One-time severance and termination benefits $ 89 $ 596 $ 3,125 $ 7,467 Professional fees — 7 103 2,272 Total cost reduction initiatives expense $ 89 $ 603 $ 3,228 $ 9,739
Recently issued and adopted accounting pronouncements	Recently adopted accounting pronouncements In November 2015, the FASB issued authoritative guidance aimed at simplifying the accounting for deferred taxes. To simplify presentation, the new guidance requires that all deferred tax assets and liabilities, along with any related valuation allowance, be classified as noncurrent on the balance sheet. As a result, each jurisdiction will now only have one net noncurrent deferred tax asset or liability. Importantly, the guidance does not change the existing requirement that only permits offsetting within a jurisdiction – that is, companies are still prohibited from offsetting deferred tax liabilities from one jurisdiction against deferred tax assets of another jurisdiction. This guidance was early adopted on a prospective basis during the second quarter of 2016 and allowed us to offset our noncurrent deferred income tax asset with our current deferred income tax liability. Other than the preceding balance sheet change, the adoption did not have a material impact on our financial statements and results of operations. Recently issued accounting pronouncements In May 2014, the FASB issued authoritative guidance that supersedes previous revenue recognition requirements and requires entities to recognize revenue in a way that depicts the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The FASB recently approved a delay which will make the updated guidance effective for fiscal years beginning after December 15, 2017, including interim periods within that reporting period. Early adoption is permitted only for fiscal years beginning after December 31, 2016, and interim periods thereafter. We are currently evaluating the effect the new standard will have on our financial statements and results of operations. In January 2016, the FASB issued authoritative guidance that amends existing requirements on the classification and measurement of financial instruments. The standard principally affects accounting for equity investments and financial liabilities where the fair value option has been elected. The guidance is effective for fiscal years beginning after December 15, 2017, and interim periods thereafter. Early adoption of certain provisions is permitted. We do not expect this guidance to materially impact our financial statements or results of operations. In February 2016, the FASB issued authoritative guidance significantly amending the current accounting for leases. Under the new provisions, all lessees will report a right-of-use asset and a liability for the obligation to make payments for all leases with the exception of those leases with a term of 12 months or less. Furthermore, all leases will fall into one of two categories: (i) a financing lease or (ii) an operating lease. Lessor accounting remains substantially unchanged with the exception that no leases entered into after the effective date will be classified as leveraged leases. For sale leaseback transactions, a sale will only be recognized if the criteria in the new revenue recognition standard are met. For public business entities, this guidance is effective for fiscal periods beginning after December 15, 2018 and interim periods thereafter. Early adoption is permitted. We are currently evaluating the effect the new guidance will have on our financial statements and results of operations. In March 2016, the FASB issued authoritative guidance with the objective to simplify several aspects of the accounting for share-based payments, including accounting for income taxes when awards vest or are settled, statutory withholdings and accounting for forfeitures. Classification of these aspects on the statement of cash flows is also addressed. For public business entities, this guidance is effective for fiscal periods beginning after December 15, 2016, and interim periods thereafter. Early adoption is permitted. We do not expect this guidance to materially impact our financial statements or results of operations in connection with our outstanding awards. In March 2016, the FASB issued authoritative guidance that clarifies that the assessment of whether an embedded contingent put or call option in a financial instrument is clearly and closely related to the debt host requires only an analysis of the four-step decision sequence described in ASC 815. The guidance is effective for fiscal years beginning after December 15, 2016. Early adoption is permitted in any interim period for which financial statements have not been issued, but would be retroactively applied to the beginning of the year that includes the interim period. We do not expect this guidance to materially impact our financial statements or results of operations. In June 2016, the FASB issued authoritative guidance which modifies the measurement of expected credit losses of certain financial instruments. The guidance is effective for fiscal years beginning after December 15, 2020, however early adoption is permitted for fiscal years beginning after December 15, 2018. We are currently evaluating the effect the new guidance will have on our financial statements and results of operations.
Liabilities Subject to Compromise	Liabilities Subject to Compromise. Our financial statements include amounts classified as liabilities subject to compromise which represent estimates of pre-petition obligations that we anticipate will be allowed as claims in our bankruptcy case. These liabilities are reported at the amounts expected to be allowed by the Bankruptcy Court, even if they may be settled for lesser amounts. The amounts currently classified as liabilities subject to compromise may be subject to future adjustments depending on the Bankruptcy Court actions, further development with respect to disputed claims, and other events. Additional amounts may be included in liabilities subject to compromise in future periods if executory contracts and unexpired leases are rejected. Conversely, to the extent that such executory contracts or unexpired leases are not rejected and are instead assumed, certain liabilities characterized as subject to compromise may be converted to post-petition liabilities. Because of the uncertain nature of many of the potential claims, the magnitude of such claims is not reasonably estimable at this time. We will continue to evaluate these liabilities during the pendency of the Chapter 11 Cases and adjust amounts as necessary. The magnitude of claims and or the adjustments to such claims may be material. Nothing herein constitutes an admission or waiver of any rights. The following table summarizes the components of “Liabilities subject to compromise” included on our Consolidated Balance Sheet as of September 30, 2016: September 30, 2016 Accounts payable and accrued liabilities $ 9,740 Accrued payroll and benefits payable 5,133 Revenue distribution payable 4,690 Senior Notes and associated accrued interest 1,267,265 Liabilities subject to compromise $ 1,286,828
Reorganization Items	Reorganization Items. We use this category to reflect, where applicable, post-petition revenues, expenses, gains and losses that are direct and incremental as a result of the reorganization of the business. We have incurred and will continue to incur significant costs associated with the reorganization. The amount of these costs, which are being expensed as incurred, are expected to significantly affect our results of operations. Reorganization items for the three and nine months ended September 30, 2016, are as follows: Three months ended Nine months ended September 30, 2016 Professional fees $ 4,268 $ 9,623 Claims for non-performance of executory contract 1,236 1,236 Total reorganization items $ 5,504 $ 10,859

Nature of operations and summ16

Nature of operations and summary of significant accounting policies (Tables)	9 Months Ended
	Sep. 30, 2016
Accounting Policies [Abstract]
Components of accounts receivable	Accounts receivable consisted of the following at September 30, 2016, and December 31, 2015: September 30, December 31, 2016 2015 Joint interests $ 10,471 $ 14,149 Accrued commodity sales 26,628 21,645 Derivative settlements — 40,380 Other 4,669 3,329 Allowance for doubtful accounts (495 ) (503 ) $ 41,273 $ 79,000
Components of inventory	Inventories consisted of the following at September 30, 2016, and December 31, 2015: September 30, December 31, 2016 2015 Equipment inventory $ 9,066 $ 11,470 Commodities 1,355 1,698 Inventory valuation allowance (2,300 ) (839 ) $ 8,121 $ 12,329
Adjustments to inventory	Three months ended Nine months ended September 30, September 30, 2016 2015 2016 2015 Inventory - lower of cost or market adjustment $ 202 $ — $ 1,461 $ 7,296
Components of unevaluated oil and natural gas properties	The costs of unevaluated oil and natural gas properties, which are excluded from amortization until the properties are evaluated, consisted of the following at September 30, 2016, and December 31, 2015: September 30, December 31, 2016 2015 Undeveloped acreage $ 13,864 $ 60,031 Wells and facilities in progress pending determination 3,251 6,874 Total unevaluated oil and natural gas properties excluded from amortization $ 17,115 $ 66,905
Components of cost reduction initiatives expense	The expense consists of costs for one-time severance and termination benefits in connection with our reductions in force and third party legal and professional services we have engaged to assist in our cost savings initiatives as follows: Three months ended Nine months ended September 30, September 30, 2016 2015 2016 2015 One-time severance and termination benefits $ 89 $ 596 $ 3,125 $ 7,467 Professional fees — 7 103 2,272 Total cost reduction initiatives expense $ 89 $ 603 $ 3,228 $ 9,739

Chapter 11 Filing (Tables)

Chapter 11 Filing (Tables)	9 Months Ended
	Sep. 30, 2016
Reorganizations [Abstract]
Summary of Components of Liabilities Subject to Compromise Included on Our Consolidated Balance Sheet	The following table summarizes the components of “Liabilities subject to compromise” included on our Consolidated Balance Sheet as of September 30, 2016: September 30, 2016 Accounts payable and accrued liabilities $ 9,740 Accrued payroll and benefits payable 5,133 Revenue distribution payable 4,690 Senior Notes and associated accrued interest 1,267,265 Liabilities subject to compromise $ 1,286,828
Reorganization Items	Reorganization items for the three and nine months ended September 30, 2016, are as follows: Three months ended Nine months ended September 30, 2016 Professional fees $ 4,268 $ 9,623 Claims for non-performance of executory contract 1,236 1,236 Total reorganization items $ 5,504 $ 10,859

Supplemental disclosures to t18

Supplemental disclosures to the consolidated statements of cash flows (Tables)	9 Months Ended
	Sep. 30, 2016
Supplemental Cash Flow Elements [Abstract]
Supplemental disclosures to the consolidated statements of cash flows	Supplemental disclosures to the consolidated statements of cash flows are presented below: Nine months ended September 30, 2016 2015 Net cash provided by operating activities included: Cash payments for interest $ 19,899 $ 77,437 Interest capitalized (1,741 ) (8,115 ) Cash payments for interest, net of amounts capitalized $ 18,158 $ 69,322 Cash payments for income taxes $ 250 $ 639 Cash payments for reorganization items $ 4,255 $ — Non-cash financing activities included: Repayment of Credit Facility with proceeds from early termination of derivative contracts (See Note 4) $ 103,560 $ — Non-cash investing activities included: Asset retirement obligation additions and revisions $ 4,015 $ 3,637 Change in accrued oil and gas capital expenditures $ (22,543 ) $ (116,237 )

Debt (Tables)

Debt (Tables)	9 Months Ended
	Sep. 30, 2016
Debt Disclosure [Abstract]
Components of debt	As of the dates indicated, debt consisted of the following: September 30, 2016 December 31, 2015 9.875% Senior Notes due 2020, net of discount of $0 and $4,185, respectively (1) $ — $ 293,815 8.25% Senior Notes due 2021 (1) — 384,045 7.625% Senior Notes due 2022, including premium of $0 and $4,939, respectively (1) — 530,849 Credit Facility (2) 444,440 367,000 Real estate mortgage notes, principal and interest payable monthly, bearing interest at rates ranging from 3.16% to 5.46%, due August 2021 through December 2028; collateralized by real property (2) 9,735 10,182 Installment notes payable, principal and interest payable monthly, bearing interest at rates ranging from 2.85% to 5.00%, due October 2016 through February 2018; collateralized by automobiles, machinery and equipment (2) 683 1,799 Capital lease obligations (2) 17,577 19,437 Total debt, net 472,435 1,607,127 Less current portion 472,435 1,607,127 Total long-term debt, net $ — $ — (1) These unsecured obligations have been classified as “Liabilities subject to compromise” as of September 30, 2016. (2) These secured obligations have not been classified as “Liabilities subject to compromise” as we believe the values of the underlying assets provide sufficient collateral to satisfy such obligations.
Premiums, discounts and debt issuance costs	As a result, we wrote off the remaining balance of unamortized issuance costs, premium and discount on March 31, 2016, as follows: Non-cash expense for write-off of debt issuance costs on Senior Notes $ 17,756 Non-cash expense for write-off of debt discount costs on Senior Notes 4,014 Non-cash gain for write-off of debt premium on Senior Notes (4,800 ) Total $ 16,970

Derivative instruments (Tables)

Derivative instruments (Tables)	9 Months Ended
	Sep. 30, 2016
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Derivative instruments recorded on the balance sheet at fair value	The estimated fair values of derivative instruments are provided below. The carrying amounts of these instruments are equal to the estimated fair values. As of December 31, 2015 Assets Liabilities Net value Natural gas derivative contracts $ 41,328 $ (1,158 ) $ 40,170 Crude oil derivative contracts 123,068 — 123,068 Total derivative instruments 164,396 (1,158 ) 163,238 Less: Netting adjustments (1) 1,158 (1,158 ) — Derivative instruments - current 143,737 — 143,737 Derivative instruments - long-term $ 19,501 $ — $ 19,501 (1) Amounts represent the impact of master netting agreements that allow us to net settle positive and negative positions with the same counterparty. Positive and negative positions with counterparties are netted only to the extent that they relate to the same current versus noncurrent classification on the balance sheet.
Non-hedge derivative gains (losses) in the consolidated statements of operations	Non-hedge derivative gains in the consolidated statements of operations are comprised of the following: Three months ended Nine months ended September 30, September 30, 2016 2015 2016 2015 Change in fair value of commodity price derivatives $ — $ 30,941 $ (163,238 ) $ (67,883 ) Settlement gains on commodity price derivatives — 54,474 62,626 157,754 Settlement gains on early terminations of commodity price derivatives — — 91,144 15,395 Total non-hedge derivative gains (losses) $ — $ 85,415 $ (9,468 ) $ 105,266

Fair value measurements (Tables

Fair value measurements (Tables)	9 Months Ended
	Sep. 30, 2016
Fair Value Disclosures [Abstract]
Fair value hierarchy for financial instruments measured at fair value on a recurring basis	The fair value hierarchy for our financial assets and liabilities is shown by the following table: As of December 31, 2015 Derivative assets Derivative liabilities Net assets (liabilities) Significant other observable inputs (Level 2) $ 41,328 $ (1,158 ) $ 40,170 Significant unobservable inputs (Level 3) 123,068 — 123,068 Netting adjustments (1) (1,158 ) 1,158 — $ 163,238 $ — $ 163,238 (1) Amounts represent the impact of master netting agreements that allow us to net settle positive and negative positions with the same counterparty. Positive and negative positions with counterparties are netted on the balance sheet only to the extent that they relate to the same current versus noncurrent classification.
Level 3 rollforward	Changes in the fair value of our derivative instruments classified as Level 3 in the fair value hierarchy during the nine months ended September 30, 2016 and 2015 were: Nine months ended September 30, Net derivative assets (liabilities) 2016 2015 Beginning balance $ 123,068 $ 195,167 Realized and unrealized (losses) gains included in non-hedge derivative gains (9,216 ) 4,660 Settlements received (113,852 ) (62,127 ) Ending balance $ — $ 137,700 Losses relating to instruments still held at the reporting date included in non-hedge derivative gains for the period $ — $ 45,835
Fair value of other financial instruments	The carrying value and estimated fair value of our debt at September 30, 2016, and December 31, 2015, were as follows: September 30, 2016 December 31, 2015 Level 2 Carrying value Estimated fair value Carrying value Estimated fair value 9.875% Senior Notes due 2020 $ 298,000 $ 203,385 $ 293,815 $ 75,750 8.25% Senior Notes due 2021 384,045 248,746 384,045 96,956 7.625% Senior Notes due 2022 525,910 352,360 530,849 120,478 Other secured debt 10,418 10,418 11,981 11,981
Offsetting Assets and Liabilities	The following table summarizes our derivative assets and liabilities which are offset in the consolidated balance sheets under our master netting agreements. It also reflects the amounts outstanding under our senior secured revolving credit facility that are available to offset our net derivative assets due from counterparties that are Lenders. Offset in the consolidated balance sheets Gross amounts not offset in the consolidated balance sheets Gross assets (liabilities) Offsetting assets (liabilities) Net assets (liabilities) Derivatives(1) Amounts outstanding under senior secured revolving credit facility Net amount As of December 31, 2015 Derivative assets $ 164,396 $ (1,158 ) $ 163,238 $ — $ (103,618 ) $ 59,620 Derivative liabilities (1,158 ) 1,158 — — — — $ 163,238 $ — $ 163,238 $ — $ (103,618 ) $ 59,620 (1) Since positive and negative positions with a counterparty are netted on the balance sheet only to the extent that they relate to the same current versus noncurrent classification, these represent remaining amounts that could have been offset under our master netting agreements.

Asset retirement obligations (T

Asset retirement obligations (Tables)	9 Months Ended
	Sep. 30, 2016
Asset Retirement Obligation Disclosure [Abstract]
Asset retirement obligations	The following table provides a summary of our asset retirement obligation activity during the nine months ended September 30, 2016 and 2015. Nine months ended September 30, 2016 2015 Beginning balance $ 48,612 $ 47,424 Liabilities incurred in current period 2,554 1,852 Liabilities settled and disposed in current period (1,380 ) (4,886 ) Revisions in estimated cash flows 1,461 1,785 Accretion expense 2,859 2,727 Ending balance 54,106 48,902 Less current portion included in accounts payable and accrued liabilities 3,895 2,384 $ 50,211 $ 46,518

Deferred compensation (Tables)

Deferred compensation (Tables)	9 Months Ended
	Sep. 30, 2016
Share Based Compensation [Abstract]
Rollforward of unvested deferred compensation	A summary of our phantom stock and RSU activity during the nine months ended September 30, 2016, is presented in the following table: Phantom Plan RSU Plan Weighted average grant date fair value Phantom shares Vest date fair value Weighted average grant date fair value Restricted Stock Units Vest date fair value ($ per share) ($ per share) Unvested and outstanding at January 1, 2016 $ 18.62 10,619 $ 10.53 269,886 Granted $ — — $ — — Vested $ 18.39 (9,729 ) $ — $ 9.01 (140,818 ) $ — Forfeited $ 21.09 (890 ) $ 8.24 (28,769 ) Unvested and outstanding at September 30, 2016 $ — — $ 7.20 100,299 A summary of our restricted stock activity during the nine months ended September 30, 2016, is presented below: Time Vested Performance Vested Weighted average grant date fair value Restricted shares Vest date fair value Weighted average grant date fair value Restricted shares ($ per share) ($ per share) Unvested and outstanding at January 1, 2016 $ 795.13 13,979 $ 278.97 28,448 Granted $ — — $ — — Vested $ 798.85 (5,279 ) $ 93 $ — — Forfeited $ 810.01 (1,773 ) $ 293.62 (6,374 ) Unvested and outstanding at September 30, 2016 $ 788.48 6,927 $ 274.74 22,074
Summary of compensation expense	A summary of compensation expense for the 2015 Cash LTIP is presented below: Three months ended Nine months ended September 30, September 30, 2016 2015 2016 2015 2015 Cash LTIP expense $ 281 $ 187 $ 849 $ 187
Stock-based compensation cost	A portion of stock-based compensation cost associated with employees involved in our acquisition, exploration, and development activities has been capitalized as part of our oil and natural gas properties. The remaining cost is reflected in lease operating and general and administrative expenses in the consolidated statements of operations. We recognized stock-based compensation expense as follows for the periods indicated: Three months ended Nine months ended September 30, September 30, 2016 2015 2016 2015 Stock-based compensation cost (credit) $ (5,705 ) $ (581 ) $ (6,220 ) $ (143 ) Less: stock-based compensation cost capitalized 1,167 (49 ) 965 (352 ) Stock-based compensation expense (credit) $ (4,538 ) $ (630 ) $ (5,255 ) $ (495 ) Payments for stock-based compensation $ — $ 333 $ 49 $ 3,977

Nature of operations and summ24

Nature of operations and summary of significant accounting policies (Cash and Accounts Receivable) (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Jun. 30, 2016	Dec. 31, 2015
Components of accounts receivable
Joint interests	$ 10,471		$ 14,149
Accrued commodity sales	26,628		21,645
Derivative settlements		$ 119,303	40,380
Other	4,669		3,329
Allowance for doubtful accounts	(495)		(503)
Accounts receivable, net	41,273		$ 79,000
JP Morgan Chase Bank, N.A.
Cash and accounts receivable
Cash held	37,535
Cash | Arvest Bank
Cash and accounts receivable
Cash held	49,852
Cash Equivalents | Arvest Bank
Cash and accounts receivable
Cash held	$ 101,095

Nature of operations and summ25

Nature of operations and summary of significant accounting policies (Inventories) (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Energy Related Inventory [Abstract]
Equipment inventory	$ 9,066	$ 11,470
Commodities	1,355	1,698
Inventory valuation allowance	(2,300)	(839)
Inventories, net	$ 8,121	$ 12,329

Nature of operations and summ26

Nature of operations and summary of significant accounting policies (Inventory Adjustments) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Inventory Adjustments [Abstract]
Inventory - lower of cost or market adjustment	$ 202	$ 0	$ 1,461	$ 13,311
Other Energy Equipment
Inventory Adjustments [Abstract]
Inventory - lower of cost or market adjustment	$ 202		$ 1,461	$ 7,296

Nature of operations and summ27

Nature of operations and summary of significant accounting policies (Unevaluated Oil and Natural Gas Properties) (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Capitalized costs of unproved properties excluded from amortization
Undeveloped acreage	$ 13,864	$ 60,031
Total unevaluated oil and natural gas properties excluded from amortization	17,115	66,905
Uncompleted Wells Equipment and Facilities
Capitalized costs of unproved properties excluded from amortization
Wells and facilities in progress pending determination	$ 3,251	$ 6,874

Nature of operations and summ28

Nature of operations and summary of significant accounting policies (Asset Impairment) (Details) $ in Thousands	1 Months Ended	3 Months Ended		9 Months Ended
	Oct. 31, 2016USD ($)Rig	Sep. 30, 2016USD ($)	Sep. 30, 2015USD ($)	Sep. 30, 2016USD ($)	Sep. 30, 2015USD ($)
Long Lived Assets Held For Sale [Line Items]
Loss on impairment of other assets		$ 202	$ 0	$ 1,461	$ 13,311
Subsequent Event
Long Lived Assets Held For Sale [Line Items]
Number of drilling rigs | Rig	4
Sale price of drilling rigs	$ 2,000
Anticipated sale of property closing period	2017-01
Upstream Equipment
Long Lived Assets Held For Sale [Line Items]
Loss on impairment of other assets					$ 6,015

Nature of operations and summ29

Nature of operations and summary of significant accounting policies (Income Taxes) (Details)	Sep. 30, 2016USD ($)
Income Tax Disclosure [Abstract]
Valuation allowance	$ 580,280,000
Deferred Tax Assets, Net of Valuation Allowance	$ 0

Nature of operations and summ30

Nature of operations and summary of significant accounting policies (Cost Reduction Initiatives) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Restructuring Cost and Reserve [Line Items]
Cost reduction initiatives expense	$ 89	$ 603	$ 3,228	$ 9,739
One-time Severance and Termination Benefits
Restructuring Cost and Reserve [Line Items]
Cost reduction initiatives expense	$ 89	596	3,125	7,467
Professional Fees
Restructuring Cost and Reserve [Line Items]
Cost reduction initiatives expense		$ 7	$ 103	$ 2,272

Chapter 11 Filing--Narrative (D

Chapter 11 Filing--Narrative (Details) - USD ($) $ in Thousands	1 Months Ended		3 Months Ended		9 Months Ended
	May 01, 2016	Mar. 31, 2016	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Apr. 01, 2016	Mar. 01, 2016	Dec. 31, 2015
Chapter Eleven Filing [Line Item]
Grace period to pay interest to avoid event of default		30 days
Accounts payable and accrued liabilities			$ 9,740		$ 9,740
Accrued payroll and benefits payable			5,133		5,133
Revenue distribution payable			4,690		4,690
Senior Notes and associated accrued interest			1,267,265		1,267,265
Liabilities subject to compromise			1,286,828		1,286,828
Professional fees			4,268		9,623
Claims for non-performance of executory contract			1,236		1,236
Total reorganization items			$ 5,504	$ 0	$ 10,859	$ 0
Senior Notes
Chapter Eleven Filing [Line Item]
Ad hoc committee senior note outstanding ownership percentage			50.00%		50.00%
Senior Notes | Eight Point Two Five Percent Senior Notes Due Two Thousand Twenty One
Chapter Eleven Filing [Line Item]
Stated interest rate			8.25%		8.25%			8.25%	8.25%
Grace period to pay interest to avoid event of default		30 days
Senior Notes | Nine Point Eight Seven Five Percent Senior Notes Due Two Thousand Twenty
Chapter Eleven Filing [Line Item]
Stated interest rate			9.875%		9.875%		9.875%		9.875%
Grace period to pay interest to avoid event of default	30 days

Supplemental disclosures to t32

Supplemental disclosures to the consolidated statements of cash flows (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2016	Sep. 30, 2015
Net cash provided by operating activities included:
Cash payments for interest		$ 19,899	$ 77,437
Interest capitalized		(1,741)	(8,115)
Cash payments for interest, net of amounts capitalized		18,158	69,322
Cash payments for income taxes		250	639
Cash payments for reorganization items		4,255
Non-cash financing activities included:
Repayment of Credit Facility with proceeds from early termination of derivative contracts (See Note 4)	$ 103,560	103,560
Non-cash investing activities included:
Asset retirement obligation additions and revisions		4,015	3,637
Change in accrued oil and gas capital expenditures		$ (22,543)	$ (116,237)

Debt (Components of Debt) (Deta

Debt (Components of Debt) (Details) - USD ($) $ in Thousands		Sep. 30, 2016	Dec. 31, 2015
Long-term debt [Abstract]
Credit Facility	[1]	$ 444,440	$ 367,000
Real estate mortgage notes payable	[1]	9,735	10,182
Installment notes payable	[1]	683	1,799
Capital lease obligations	[1]	17,577	19,437
Total debt, net		472,435	1,607,127
Less current portion		$ 472,435	1,607,127
Nine Point Eight Seven Five Percent Senior Notes Due Two Thousand Twenty
Long-term debt [Abstract]
Senior Notes	[2]		293,815
Eight Point Two Five Percent Senior Notes Due Two Thousand Twenty One
Long-term debt [Abstract]
Senior Notes	[2]		384,045
7.625% Senior Notes due 2022
Long-term debt [Abstract]
Senior Notes	[2]		$ 530,849
[1]	These secured obligations have not been classified as “Liabilities subject to compromise” as we believe the values of the underlying assets provide sufficient collateral to satisfy such obligations
[2]	These unsecured obligations have been classified as “Liabilities subject to compromise” as of September 30, 2016

Debt (Components of Debt) (Pare

Debt (Components of Debt) (Parenthetical) (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Apr. 01, 2016	Mar. 01, 2016	Dec. 31, 2015
Nine Point Eight Seven Five Percent Senior Notes Due Two Thousand Twenty
Long-term debt [Abstract]
Unamortized discount	$ 0			$ 4,185
7.625% Senior Notes due 2022
Long-term debt [Abstract]
Unamortized premium	$ 0			$ 4,939
Senior Notes | Nine Point Eight Seven Five Percent Senior Notes Due Two Thousand Twenty
Long-term debt [Abstract]
Stated interest rate	9.875%	9.875%		9.875%
Senior Notes | Eight Point Two Five Percent Senior Notes Due Two Thousand Twenty One
Long-term debt [Abstract]
Stated interest rate	8.25%		8.25%	8.25%
Senior Notes | 7.625% Senior Notes due 2022
Long-term debt [Abstract]
Stated interest rate	7.625%			7.625%
Mortgages | Minimum
Long-term debt [Abstract]
Stated interest rate	3.16%
Mortgages | Maximum
Long-term debt [Abstract]
Stated interest rate	5.46%
Secured Debt | Minimum
Long-term debt [Abstract]
Stated interest rate	2.85%
Secured Debt | Maximum
Long-term debt [Abstract]
Stated interest rate	5.00%

Debt (Senior Notes) (Details)

Debt (Senior Notes) (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended			9 Months Ended
	Mar. 31, 2016	Sep. 30, 2016	Mar. 31, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Debt Instrument [Line Items]
Grace periods to pay interest to avoid event of default	30 days
Write-off of Senior Note issuance costs, discount and premium		$ 0	$ 16,970	$ 0	$ 16,970	$ 0
Senior Notes
Debt Instrument [Line Items]
Interest expense		$ 25,303			$ 39,641

Debt (Premiums, Discounts and D

Debt (Premiums, Discounts and Debt Issuance Costs) (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2016	Mar. 31, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Debt Disclosure [Abstract]
Non-cash expense for write-off of debt issuance costs on Senior Notes		$ 17,756
Non-cash expense for write-off of debt discount costs on Senior Notes		4,014
Non-cash gain for write-off of debt premium on Senior Notes		(4,800)
Total	$ 0	$ 16,970	$ 0	$ 16,970	$ 0

Debt (Senior Secured Revolving

Debt (Senior Secured Revolving Credit Facility) (Details) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2016USD ($)	Sep. 30, 2016USD ($)
Line Of Credit Facility [Line Items]
Amount utilized to offset outstanding borrowings under credit facility	$ 103,560	$ 103,560
Credit Facility
Line Of Credit Facility [Line Items]
Proceeds from additional borrowing credit facility		181,000
Amount utilized to offset outstanding borrowings under credit facility		$ 103,560
Weighted average interest rate	5.00%	5.00%
Additional interest rate on outstanding amounts in event of default waived		2.00%

Debt (Capital Leases) (Details)

Debt (Capital Leases) (Details) - U.S. Bank National Association - Capital Lease Obligations - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2016	Dec. 31, 2013
Leases, Capital [Abstract]
Proceeds from sale and leaseback of assets		$ 24,500
Lease term	84 months
Purchase option period	72 months
Implicit interest rate	3.80%
Minimum lease payments	$ 3,181

Derivative instruments - Additi

Derivative instruments - Additional information (Details) - USD ($)	3 Months Ended	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2016	Jun. 30, 2016	Dec. 31, 2015
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Derivative assets (liabilities), net	$ 0	$ 0		$ 163,238,000
Receivable derivative settlements			$ 119,303,000	$ 40,380,000
Amount utilized to offset outstanding borrowings under credit facility	$ 103,560,000	$ 103,560,000

Derivative instruments (Effect

Derivative instruments (Effect of Derivative Instruments on the Consolidated Balance Sheets) (Details) - USD ($)		Sep. 30, 2016	Dec. 31, 2015
Fair value of derivative instruments
Derivative assets, gross			$ 164,396,000
Derivative liabilities, gross			(1,158,000)
Derivative assets (liabilities), net		$ 0	163,238,000
Netting adjustments	[1]		1,158,000
Derivative Liability, Netting adjustments	[1]		(1,158,000)
Current derivative assets, net		0	143,737,000
Current derivative liabilities, net			0
Current derivative assets (liabilities), net			143,737,000
Long-term derivative assets, net		$ 0	19,501,000
Long-term derivative liabilities, net			0
Long-term derivative assets (liabilities), net			19,501,000
Natural Gas Derivative Contracts
Fair value of derivative instruments
Derivative assets, gross			41,328,000
Derivative liabilities, gross			(1,158,000)
Derivative assets (liabilities), net			40,170,000
Crude Oil Derivative Contracts
Fair value of derivative instruments
Derivative assets, gross			123,068,000
Derivative assets (liabilities), net			$ 123,068,000
[1]	Amounts represent the impact of master netting agreements that allow us to net settle positive and negative positions with the same counterparty. Positive and negative positions with counterparties are netted only to the extent that they relate to the same current versus noncurrent classification on the balance sheet.

Derivative instruments (Effec41

Derivative instruments (Effect of Derivative Instruments on the Consolidated Statements of Operations) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Change in fair value of commodity price derivatives		$ 30,941	$ (163,238)	$ (67,883)
Settlement gains on commodity price derivatives		54,474	62,626	157,754
Settlement gains on early terminations of commodity price derivatives			91,144	15,395
Total non-hedge derivative gains (losses)	$ 0	$ 85,415	$ (9,468)	$ 105,266

Fair value measurements (Recurr

Fair value measurements (Recurring Fair Value Measurements) (Details) - USD ($)		9 Months Ended
		Sep. 30, 2016	Dec. 31, 2015
Fair Value Hierarchy for Financial Instruments Measured at Fair Value on a Recurring Basis
Derivative assets (liabilities), net		$ 0	$ 163,238,000
Derivative contracts termination date		2016-05
Derivative assets, gross			164,396,000
Derivative liabilities, gross			(1,158,000)
Derivative assets, amount offset			(1,158,000)
Derivative liabilities, amounts offset			1,158,000
Derivative assets, net			163,238,000
Derivative liabilities, net			0
Recurring Fair Value Measurements
Fair Value Hierarchy for Financial Instruments Measured at Fair Value on a Recurring Basis
Derivative assets (liabilities), net			163,238,000
Derivative assets, amount offset	[1]		(1,158,000)
Derivative liabilities, amounts offset	[1]		1,158,000
Derivative assets amount offset (liabilities), net	[1]		0
Derivative assets, net			163,238,000
Derivative liabilities, net			0
Recurring Fair Value Measurements | Significant Other Observable Inputs (Level 2)
Fair Value Hierarchy for Financial Instruments Measured at Fair Value on a Recurring Basis
Derivative assets (liabilities), net			40,170,000
Derivative assets, gross			41,328,000
Derivative liabilities, gross			(1,158,000)
Recurring Fair Value Measurements | Significant Unobservable Inputs (Level 3)
Fair Value Hierarchy for Financial Instruments Measured at Fair Value on a Recurring Basis
Derivative assets (liabilities), net			123,068,000
Derivative assets, gross			123,068,000
Derivative liabilities, gross			$ 0
[1]	Amounts represent the impact of master netting agreements that allow us to net settle positive and negative positions with the same counterparty. Positive and negative positions with counterparties are netted on the balance sheet only to the extent that they relate to the same current versus noncurrent classification.

Fair value measurements (Level

Fair value measurements (Level 3 Rollforward) (Details) - Recurring Fair Value Measurements - Significant Unobservable Inputs (Level 3) - Derivative - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Level 3 Rollforward
Beginning balance	$ 123,068	$ 195,167
Realized and unrealized (losses) gains included in non-hedge derivative gains	(9,216)	4,660
Settlements received	(113,852)	(62,127)
Ending balance	0	137,700
Losses relating to instruments still held at the reporting date included in non-hedge derivative gains for the period	$ 0	$ 45,835

Fair value measurements (Nonrec

Fair value measurements (Nonrecurring Fair Value Measurements) (Details) - Significant Unobservable Inputs (Level 3) - Nonrecurring Fair Value Measurements	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Nonrecurring Fair Value Measurements
Annual inflation rate	2.42%	2.91%
Credit-adjusted risk-free interest rate	20.00%	13.45%

Fair value measurements (Fair V

Fair value measurements (Fair Value of Other Financial Instruments) (Details) - Significant Other Observable Inputs (Level 2) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
9.875% Senior Notes due 2020 | Carrying Value
Fair Value of Other Financial Instruments
Senior Notes	$ 298,000	$ 293,815
9.875% Senior Notes due 2020 | Estimated Fair Value
Fair Value of Other Financial Instruments
Senior Notes	203,385	75,750
8.25% Senior Notes due 2021 | Carrying Value
Fair Value of Other Financial Instruments
Senior Notes	384,045	384,045
8.25% Senior Notes due 2021 | Estimated Fair Value
Fair Value of Other Financial Instruments
Senior Notes	248,746	96,956
7.625% Senior Notes due 2022 | Carrying Value
Fair Value of Other Financial Instruments
Senior Notes	525,910	530,849
7.625% Senior Notes due 2022 | Estimated Fair Value
Fair Value of Other Financial Instruments
Senior Notes	352,360	120,478
Secured Debt | Carrying Value
Fair Value of Other Financial Instruments
Other secured debt	10,418	11,981
Secured Debt | Estimated Fair Value
Fair Value of Other Financial Instruments
Other secured debt	$ 10,418	$ 11,981

Fair value measurements (Counte

Fair value measurements (Counterparty Credit Risk) (Details) $ in Thousands	Dec. 31, 2015USD ($)financial_institutions
Counterparty Credit Risk
Derivative liabilities subject to acceleration | $	$ 1,158
Concentration of Counterparty Credit Risk
Counterparty Credit Risk
Derivative contracts, number of counterparties | financial_institutions	7

Fair value measurements (Deriva

Fair value measurements (Derivatives Offset in the Consolidated Balance Sheets) (Details) $ in Thousands	Dec. 31, 2015USD ($)
Fair Value Disclosures [Abstract]
Derivative assets, gross	$ 164,396
Derivative assets, amount offset	(1,158)
Derivative assets	163,238
Derivative assets, not offset	0	[1]
Credit facility balance available to offset net derivative assets	(103,618)
Derivative asset, net	59,620
Derivative liabilities, gross	(1,158)
Derivative liabilities, amounts offset	1,158
Derivative liabilities	0
Derivative liabilities, not offset	0	[1]
Credit facility balance available to offset net derivative liabilities	0
Derivative liability, net	0
Derivative Asset (Liability), Fair Value, Gross Asset	163,238
Derivative Asset (Liability), Fair Value, Gross Liability	0
Derivative Asset (Liability), Net	163,238
Derivative liability asset not offset	0	[1]
Derivative asset (liability), net	$ 59,620
[1]	Since positive and negative positions with a counterparty are netted on the balance sheet only to the extent that they relate to the same current versus noncurrent classification, these represent remaining amounts that could have been offset under our master netting agreements.

Asset retirement obligations (D

Asset retirement obligations (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Beginning balance	$ 48,612	$ 47,424
Liabilities incurred in current period	2,554	1,852
Liabilities settled and disposed in current period	(1,380)	(4,886)
Revisions in estimated cash flows	1,461	1,785
Accretion expense	2,859	2,727
Ending balance	54,106	48,902
Less current portion included in accounts payable and accrued liabilities	3,895	2,384
Asset retirement obligations, long-term	$ 50,211	$ 46,518	$ 46,434

Deferred compensation (Phantom

Deferred compensation (Phantom Stock Plan and Restricted Stock Unit Plan) (Details) $ / shares in Units, $ in Thousands	9 Months Ended
	Sep. 30, 2016USD ($)$ / sharesshares
Phantom Stock Plan | Phantom Shares
Stock-Based Compensation [Line Items]
Award vesting period (in years)	5 years
Days from vesting date to cash settlement	120 days
Unvested and outstanding at end of period (in shares)	0
Weighted average grant date fair value
Unvested and outstanding at beginning of period ($ per share) | $ / shares	$ 18.62
Granted ($ per share) | $ / shares	0
Vested ($ per share) | $ / shares	18.39
Forfeited ($ per share) | $ / shares	21.09
Unvested and outstanding at end of period ($ per share) | $ / shares	$ 0
Shares
Unvested and outstanding at beginning of period (in shares)	10,619
Granted (in shares)	0
Vested (in shares)	(9,729)
Forfeited (in shares)	(890)
Unvested and outstanding at end of period (in shares)	0
Vest date fair value
Vest date fair value | $	$ 0
Non-Officer Restricted Stock Unit Plan | Restricted Stock Units (RSU)
Stock-Based Compensation [Line Items]
Days from vesting date to cash settlement	120 days
Unvested and outstanding at end of period (in shares)	100,299
Maximum percentage of fair market value of the company available for share-based awards	2.00%
Weighted average grant date fair value
Unvested and outstanding at beginning of period ($ per share) | $ / shares	$ 10.53
Granted ($ per share) | $ / shares	0
Vested ($ per share) | $ / shares	9.01
Forfeited ($ per share) | $ / shares	8.24
Unvested and outstanding at end of period ($ per share) | $ / shares	$ 7.20
Shares
Unvested and outstanding at beginning of period (in shares)	269,886
Granted (in shares)	0
Vested (in shares)	(140,818)
Forfeited (in shares)	(28,769)
Unvested and outstanding at end of period (in shares)	100,299
Vest date fair value
Vest date fair value | $	$ 0
Non-Officer Restricted Stock Unit Plan | Restricted Stock Units (RSU) | Maximum
Stock-Based Compensation [Line Items]
Award vesting period (in years)	3 years
Phantom Stock Plan and Restricted Stock Unit Plan | Restricted Stock Units (RSU)
Vest date fair value
Estimated fair value per share at end of period ($ per share) | $ / shares	$ 0
Weighted average remaining contractual term	7 months 6 days

Deferred compensation (Cash Inc

Deferred compensation (Cash Incentive Plan) (Details) - The 2015 Cash LTIP - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Deferred Compensation Arrangement With Individual Excluding Share Based Payments And Postretirement Benefits [Line Items]
Deferred Compensation Arrangement with Individual, Requisite Service Period			4 years
2015 Cash LTIP expense	$ 281	$ 187	$ 849	$ 187

Deferred compensation (2010 Equ

Deferred compensation (2010 Equity Incentive Plan) (Details) - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Vest date fair value
Aggregate intrinsic value of unvested Time Vested restricted shares outstanding	$ 0
Aggregate compensation cost	$ (5,985)
Restricted Stock | 2010 Equity Incentive Plan | Maximum | Service Vesting Conditions
Stock-Based Compensation [Line Items]
Award vesting period (in years)	5 years
Restricted Stock | 2010 Equity Incentive Plan | Common Class A
Stock-Based Compensation [Line Items]
Shares reserved for issuance under the 2010 Plan	86,301
Restricted Stock | 2010 Equity Incentive Plan | Common Class A | Service Vesting Conditions
Weighted average grant date fair value
Unvested and outstanding at beginning of period ($ per share)	$ 795.13
Granted ($ per share)	0
Vested ($ per share)	798.85
Forfeited ($ per share)	810.01
Unvested and outstanding at end of period ($ per share)	$ 788.48
Shares
Unvested and outstanding at beginning of period (in shares)	13,979
Granted (in shares)	0
Vested (in shares)	(5,279)
Forfeited (in shares)	(1,773)
Unvested and outstanding at end of period (in shares)	6,927
Vest date fair value	$ 93
Restricted stock	2,597	5,678
Estimated fair value per share at end of period ($ per share)	$ 0
Restricted Stock | 2010 Equity Incentive Plan | Common Class A | Performance Vested
Weighted average grant date fair value
Unvested and outstanding at beginning of period ($ per share)	278.97
Granted ($ per share)	0
Vested ($ per share)	0
Forfeited ($ per share)	293.62
Unvested and outstanding at end of period ($ per share)	$ 274.74
Shares
Unvested and outstanding at beginning of period (in shares)	28,448
Granted (in shares)	0
Vested (in shares)	0
Forfeited (in shares)	(6,374)
Unvested and outstanding at end of period (in shares)	22,074

Deferred compensation (Stock-ba

Deferred compensation (Stock-based compensation cost) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Stock-Based Compensation Expense [Abstract]
Stock-based compensation cost (credit)	$ (5,705)	$ (581)	$ (6,220)	$ (143)
Less: stock-based compensation cost capitalized	1,167	(49)	965	(352)
Stock-based compensation expense (credit)	(4,538)	(630)	(5,255)	(495)
Payments for stock-based compensation		$ 333	49	$ 3,977
Stock-based compensation costs included in accrued payroll and benefits payable	0		0		$ 81
Time Vested Awards
Stock-Based Compensation Expense [Abstract]
Unrecognized compensation cost	$ 244		$ 244

Commitments and Contingencies -

Commitments and Contingencies - Additional information (Details) - USD ($) $ in Thousands	1 Months Ended	9 Months Ended
	May 31, 2016	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Loss Contingencies [Line Items]
Interest paid		$ 19,899	$ 77,437
Loss Contingency, Information about Litigation Matters [Abstract]
Operating leases term	84 months
Operating lease monthly payments	$ 23
Naylor Farms Case | Pending Litigation | Minimum
Loss Contingency, Information about Litigation Matters [Abstract]
Damages sought		5,000
Naylor Farms Case Putative Class Action | Pending Litigation | Minimum
Loss Contingency, Information about Litigation Matters [Abstract]
Damages sought		150,000
West Case Putative Class Action | Pending Litigation | Minimum
Loss Contingency, Information about Litigation Matters [Abstract]
Damages sought		75,000
Letter of Credit
Loss Contingencies [Line Items]
Letters of credit outstanding		828		$ 828
Interest paid		0	0
Proceeds from Letters		$ 0	$ 0