Consolidated statements of cash flows - USD ($) $ in Thousands	3 Months Ended		9 Months Ended	12 Months Ended
	Mar. 21, 2017		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cash flows from operating activities
Net income (loss)			$ (118,902)
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Non-cash reorganization items			0
Depreciation, depletion and amortization			92,599
Loss on impairment of assets			42,325
Write-off of Senior Note issuance costs, discount and premium			0
Deferred income taxes			0
Derivative losses (gains)			30,802
Loss (gain) on sale of assets			25,996
Loss (gain) on extinguishment of debt			635
Other			1,573
Change in assets and liabilities:
Accounts receivable			(12,092)
Inventories			(489)
Prepaid expenses and other assets			3,245
Accounts payable and accrued liabilities			2,622
Revenue distribution payable			6,941
Deferred compensation			9,714
Net cash provided by operating activities			84,969
Cash flows from investing activities
Expenditures for property, plant, and equipment and oil and natural gas properties			(157,718)
Proceeds from asset dispositions			189,735
Proceeds from derivative instruments			15,676
Cash in escrow			42
Net cash provided by (used in) investing activities			47,735
Cash flows from financing activities
Proceeds from long-term debt			33,000
Repayment of long-term debt			(176,407)
Repurchase of Senior Notes			0
Proceeds from rights offering, net			0
Principal payments under capital lease obligations			(2,017)
Payment of other financing fees			(4,671)
Net cash (used in) provided by financing activities			(150,095)
Net (decrease) increase in cash and cash equivalents			(17,391)
Cash and cash equivalents at beginning of period			45,123
Cash and cash equivalents at end of period	$ 45,123		27,732
Predecessor
Cash flows from operating activities
Net income (loss)	1,041,959	[1],[2]		$ (415,720)	$ (1,333,844)
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Non-cash reorganization items	(1,012,090)			0	0
Depreciation, depletion and amortization	24,915			122,928	216,574
Loss on impairment of assets	0			282,472	1,507,336
Write-off of Senior Note issuance costs, discount and premium	0			16,970	0
Deferred income taxes	0			0	(177,487)
Derivative losses (gains)	(48,006)			22,837	(145,288)
Loss (gain) on sale of assets	(206)			117	(1,584)
Loss (gain) on extinguishment of debt	0			0	(31,590)
Other	645			3,611	6,057
Change in assets and liabilities:
Accounts receivable	198			(9,243)	15,720
Inventories	466			3,576	(1,968)
Prepaid expenses and other assets	(497)			(1,620)	481
Accounts payable and accrued liabilities	8,733			25,987	(17,200)
Revenue distribution payable	(1,875)			509	(12,075)
Deferred compensation	143			(5,257)	(5,524)
Net cash provided by operating activities	14,385			47,167	19,608
Cash flows from investing activities
Expenditures for property, plant, and equipment and oil and natural gas properties	(31,179)			(146,296)	(313,481)
Proceeds from asset dispositions	1,884			1,349	42,618
Proceeds from derivative instruments	1,285			90,590	233,605
Cash in escrow	0			48	0
Net cash provided by (used in) investing activities	(28,010)			(54,309)	(37,258)
Cash flows from financing activities
Proceeds from long-term debt	270,000			181,000	120,000
Repayment of long-term debt	(444,785)			(1,952)	(102,978)
Repurchase of Senior Notes	0			0	(9,995)
Proceeds from rights offering, net	50,031			0	0
Principal payments under capital lease obligations	(568)			(2,491)	(2,400)
Payment of other financing fees	(2,410)			0	(1,404)
Net cash (used in) provided by financing activities	(127,732)			176,557	3,223
Net (decrease) increase in cash and cash equivalents	(141,357)			169,415	(14,427)
Cash and cash equivalents at beginning of period	186,480		$ 45,123	17,065	31,492
Cash and cash equivalents at end of period	$ 45,123			$ 186,480	$ 17,065

[1] Includes a loss from the sale of our EOR assets of $25,163 for the fourth quarter. See “Note 6—Acquisitions and divestitures” for additional information.

[2] Includes reorganization items income (expense) related to the Company’s restructuring under Chapter 11 filings of $988,727, $(620), $(1,070), $(858), and $(543) for the Predecessor first quarter, Successor first, second, third, and fourth quarters, respectively. See “Note 4—Fresh start accounting” for additional information.