Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Revenues:
Crude oil, natural gas and NGLs sales	$ 703,136	$ 314,920	$ 1,704,396	$ 809,156
Commodity price risk management gain (loss), net	(217,678)	(68,061)	(707,187)	245,851
Other income	904	2,358	4,058	5,656
Total revenues	486,362	249,217	1,001,267	1,060,663
Costs, expenses and other:
Lease operating expense	45,649	37,338	129,848	122,680
Production taxes	44,654	14,621	101,114	40,937
Transportation, gathering and processing expense	26,732	24,399	74,453	54,844
Exploration, geologic and geophysical expense	222	162	862	1,026
General and administrative expense	30,847	32,490	96,367	130,007
Depreciation, depletion and amortization	169,644	144,504	478,617	470,152
Accretion of asset retirement obligations	2,825	2,420	9,185	7,398
Impairment of properties and equipment	77	1,221	329	882,327
Loss (gain) on sale of properties and equipment	(220)	(289)	(561)	(642)
Other	303	1,936	2,496	6,083
Total cost, expenses and other	320,733	258,802	892,710	1,714,812
Income (loss) from operations	165,629	(9,585)	108,557	(654,149)
Interest expense	(20,098)	(21,022)	(59,199)	(66,977)
Income (loss) before income taxes	145,531	(30,607)	49,358	(721,126)
Income tax (expense) benefit	(210)	(176)	(110)	3,496
Net income (loss)	$ 145,321	$ (30,783)	$ 49,248	$ (717,630)
Earnings per share:
Basic	$ 1.48	$ (0.31)	$ 0.50	$ (7.34)
Diluted	$ 1.45	$ (0.31)	$ 0.49	$ (7.34)
Weighted-average common shares outstanding
Basic	98,183	99,617	99,018	97,762
Diluted	99,966	99,617	100,534	97,762
Common Stock, Dividends, Per Share, Declared	$ 0.12	$ 0	$ 0.24	$ 0