CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) (in thousands, except per share data) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Operating revenues and other income:
Oil, gas, and NGL production revenue	$ 562,569	$ 169,790	$ 985,734	$ 524,023
Other operating income (loss)	1,280	(158)	21,961	1,343
Total operating revenues and other income	563,849	169,632	1,007,695	525,366
Operating expenses:
Oil, gas, and NGL production expense	125,456	80,445	226,386	199,997
Depletion, depreciation, amortization, and asset retirement obligation liability accretion	204,714	180,856	371,674	414,345
Exploration	8,714	9,787	18,037	21,136
Impairment	8,750	8,750	17,500	998,513
General and administrative	24,639	27,227	49,353	54,674
Net derivative (gain) loss	370,348	167,200	715,037	(378,140)
Other operating expense, net	1,852	8,046	1,253	8,612
Total operating expenses	744,473	482,311	1,399,240	1,319,137
Loss from operations	(180,624)	(312,679)	(391,545)	(793,771)
Interest expense	(39,536)	(40,354)	(79,407)	(81,866)
Gain (loss) on extinguishment of debt	(2,144)	227,281	(2,144)	239,476
Other non-operating expense, net	(853)	(185)	(1,224)	(679)
Loss before income taxes	(223,157)	(125,937)	(474,320)	(636,840)
Income tax benefit	162	36,685	56	135,693
Net loss	$ (222,995)	$ (89,252)	$ (474,264)	$ (501,147)
Basic weighted-average common shares outstanding	118,357	113,008	116,568	113,015
Diluted weighted-average common shares outstanding	118,357	113,008	116,568	113,015
Basic net loss per common share	$ (1.88)	$ (0.79)	$ (4.07)	$ (4.43)
Diluted net loss per common share	(1.88)	(0.79)	(4.07)	(4.43)
Dividends per common share	$ 0	$ 0	$ 0.01	$ 0.01