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, 2019	Dec. 31, 2018
Cash flows from operating activities
Net (loss) income	$ 1,041,959	$ (118,902)	$ (468,948)	$ 33,442
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Non-cash reorganization items	(1,012,090)	0	0	0
Depreciation, depletion and amortization	24,915	92,599	109,633	87,888
Impairment of oil and gas assets	0	42,146	430,695	20,065
Impairment of other assets	0	179	7,188	0
Derivative losses (gains)	(48,006)	30,802	33,198	(19,297)
Loss (gain) on sale of assets	(206)	25,996	6	2,582
Loss on extinguishment of debt	0	635	1,624	0
Other	645	1,573	2,850	5,470
Change in assets and liabilities:
Accounts receivable	198	(12,092)	14,040	(6,337)
Inventories	466	(489)	393	236
Prepaid expenses and other assets	(497)	3,245	(867)	(160)
Accounts payable and accrued liabilities	8,733	2,622	(13,114)	3,441
Revenue distribution payable	(1,875)	6,941	(3,855)	8,649
Deferred compensation	143	9,714	814	10,262
Net cash provided by operating activities	14,385	84,969	113,657	146,241
Cash flows from investing activities
Expenditures for property, plant, and equipment and oil and natural gas properties	(31,179)	(157,718)	(267,068)	(324,063)
Proceeds from asset dispositions	1,884	189,735	14,667	50,523
Proceeds from derivative instruments	1,285	15,676	7,567
Payments for derivative instruments				(18,510)
Cash in escrow	0	42
Net cash (used in) provided by investing activities	(28,010)	47,735	(244,834)	(292,050)
Cash flows from financing activities
Proceeds from long-term debt	270,000	33,000	130,000	116,000
Repayment of long-term debt	(444,785)	(176,407)	(8,744)	(243,722)
Issuance of Senior Notes	0	0	0	300,000
Proceeds from rights offering, net	50,031	0	0	0
Principal payments under financing lease obligations	(568)	(2,017)	(2,102)	(2,683)
Debt extinguishment costs	0	0	(1,624)	0
Cash settlement of stock based awards	0	0	(10)	0
Payment of debt issuance costs and other financing fees	0	(4,671)	(20)	(9,136)
Treasury stock purchased	(2,410)	0	(1,174)	(4,936)
Net cash provided by (used in) financing activities	(127,732)	(150,095)	116,326	155,523
Net (decrease) increase in cash and cash equivalents	(141,357)	(17,391)	(14,851)	9,714
Cash and cash equivalents at beginning of period	186,480	45,123	37,446	27,732
Cash and cash equivalents at end of period	$ 45,123	$ 27,732	$ 22,595	$ 37,446