CONDENSED CONSOLIDATED STATEMENT OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
OPERATING REVENUES
Operating revenues	$ 288,374	$ 470,468	$ 658,769	$ 1,103,892
Gain on derivative instruments	43,974	63,649	60,036	71,906
Total operating revenues	332,348	534,117	718,805	1,175,798
OPERATING EXPENSES
Direct operations	17,423	18,093	34,667	36,427
Transportation and gathering	135,249	141,689	278,581	279,022
Taxes other than income	3,352	3,640	7,090	9,487
Exploration	4,579	4,504	6,769	10,548
Depreciation, depletion and amortization	94,622	96,147	194,757	188,405
General and administrative	23,166	22,889	56,595	53,979
Total operating expenses	278,391	286,962	578,459	577,868
Earnings (loss) on equity method investments	0	3,650	(59)	7,334
Loss on sale of assets	(241)	0	(170)	(1,500)
INCOME FROM OPERATIONS	53,716	250,805	140,117	603,764
Interest expense, net	14,543	14,567	28,754	26,748
Other expense	48	143	114	287
Income before income taxes	39,125	236,095	111,249	576,729
Income tax expense	8,751	55,086	26,965	132,957
NET INCOME	$ 30,374	$ 181,009	$ 84,284	$ 443,772
Earnings per share
Basic (in dollars per share)	$ 0.08	$ 0.43	$ 0.21	$ 1.05
Diluted (in dollars per share)	$ 0.08	$ 0.43	$ 0.21	$ 1.05
Weighted-average common shares outstanding
Basic (shares)	398,576	422,141	398,460	422,626
Diluted (shares)	401,279	424,349	400,219	424,550
Natural gas
OPERATING REVENUES
Operating revenues	$ 288,286	$ 470,482	$ 658,626	$ 1,103,656
Other
OPERATING REVENUES
Operating revenues	$ 88	$ (14)	$ 143	$ 236