Unaudited Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenues:
Crude oil and natural gas sales	$ 1,137,528	$ 626,548	$ 2,251,380	$ 1,260,398
Gain (loss) on natural gas derivatives, net	(12,685)	28,022	(2,511)	74,880
Crude oil and natural gas service operations	12,270	6,916	29,272	11,636
Total revenues	1,137,113	661,486	2,278,141	1,346,914
Operating costs and expenses:
Production expenses	90,171	82,474	183,133	155,328
Production taxes	83,595	41,965	164,175	83,198
Transportation expenses	47,254	0	96,551	0
Exploration expenses	303	3,204	2,023	8,202
Crude oil and natural gas service operations	7,688	4,478	12,271	7,315
Depreciation, depletion, amortization and accretion	447,200	395,770	901,578	777,926
Property impairments	29,162	123,316	62,946	174,689
General and administrative expenses	47,174	39,186	90,217	86,407
Net (gain) loss on sale of assets and other	(6,710)	134	(6,751)	5,669
Total operating costs and expenses	745,837	690,527	1,506,143	1,298,734
Income (loss) from operations	391,276	(29,041)	771,998	48,180
Other income (expense):
Interest expense	(74,288)	(72,744)	(150,182)	(143,916)
Other	708	373	1,362	815
Total other income (expense)	(73,580)	(72,371)	(148,820)	(143,101)
Income (loss) before income taxes	317,696	(101,412)	623,178	(94,921)
(Provision) benefit for income taxes	(75,232)	37,855	(146,768)	31,833
Net income (loss)	242,464	(63,557)	476,410	(63,088)
Foreign currency translation adjustments	16	189	18	327
Total other comprehensive income, net of tax	16	189	18	327
Comprehensive income (loss)	$ 242,480	$ (63,368)	$ 476,428	$ (62,761)
Basic net income per share (in dollars per share)	$ 0.65	$ (0.17)	$ 1.28	$ (0.17)
Diluted net income per share (in dollars per share)	$ 0.65	$ (0.17)	$ 1.27	$ (0.17)