CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) (in thousands, except per share data) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Operating revenues and other income:
Oil, gas, and NGL production revenue	$ 282,012	$ 389,419	$ 806,035	$ 1,136,749
Net gain on divestiture activity	0	0	91	323
Other operating revenues	(997)	898	255	1,347
Total operating revenues and other income	281,015	390,317	806,381	1,138,419
Operating expenses:
Oil, gas, and NGL production expense	95,257	129,042	295,254	373,397
Depletion, depreciation, amortization, and asset retirement obligation liability accretion	181,708	211,125	596,053	595,201
Exploration	8,547	11,626	29,683	33,851
Impairment	8,750	6,337	1,007,263	25,092
General and administrative	24,452	32,578	79,126	95,584
Net derivative (gain) loss	63,871	(100,889)	(314,269)	(3,463)
Other operating expense, net	1,562	1,021	10,174	422
Total operating expenses	384,147	290,840	1,703,284	1,120,084
Income (loss) from operations	(103,132)	99,477	(896,903)	18,335
Interest expense	(41,519)	(40,584)	(123,385)	(118,191)
Gain on extinguishment of debt	25,070	0	264,546	0
Other non-operating expense, net	(1,680)	(548)	(2,359)	(1,427)
Income (loss) before income taxes	(121,261)	58,345	(758,101)	(101,283)
Income tax (expense) benefit	22,969	(16,111)	158,662	16,337
Net Income (Loss)	$ (98,292)	$ 42,234	$ (599,439)	$ (84,946)
Basic weighted-average common shares outstanding	114,371	112,804	113,462	112,441
Diluted weighted-average common shares outstanding	114,371	113,334	113,462	112,441
Basic net income (loss) per common share	$ (0.86)	$ 0.37	$ (5.28)	$ (0.76)
Diluted net income (loss) per common share	(0.86)	0.37	(5.28)	(0.76)
Dividends per common share	$ 0.01	$ 0.05	$ 0.02	$ 0.10