CONDENSED CONSOLIDATED STATEMENT OF OPERATIONS (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
OPERATING REVENUES
Operating revenues	$ 470,468	$ 457,115	$ 1,103,892	$ 924,765
Gain (loss) on derivative instruments	63,649	(3,668)	71,906	1,909
TOTAL OPERATING REVENUES	534,117	453,447	1,175,798	926,674
OPERATING EXPENSES
Direct operations	18,093	15,657	36,427	35,727
Taxes other than income	3,640	5,392	9,487	12,582
Exploration	4,504	54,500	10,548	58,117
Depreciation, depletion and amortization	96,147	84,910	188,405	167,038
General and administrative	22,889	21,228	53,979	45,288
TOTAL OPERATING EXPENSES	286,962	375,958	577,868	630,098
Earnings (loss) on equity method investments	3,650	(4)	7,334	(998)
Gain (loss) on sale of assets	0	544	(1,500)	(40,505)
INCOME FROM OPERATIONS	250,805	78,029	603,764	255,073
Interest expense, net	14,567	23,328	26,748	43,386
Other expense	143	118	287	232
Income before income taxes	236,095	54,583	576,729	211,455
Income tax expense	55,086	12,152	132,957	51,793
NET INCOME	$ 181,009	$ 42,431	$ 443,772	$ 159,662
Earnings per share
Basic (in dollars per share)	$ 0.43	$ 0.09	$ 1.05	$ 0.35
Diluted (in dollars per share)	$ 0.43	$ 0.09	$ 1.05	$ 0.35
Weighted-average common shares outstanding
Basic (in shares)	422,141	451,055	422,626	455,361
Diluted (in shares)	424,349	453,114	424,550	457,142
Dividends per common share (in dollars per share)	$ 0.09	$ 0.06	$ 0.16	$ 0.12
Natural gas
OPERATING REVENUES
Operating revenues	$ 470,482	$ 364,660	$ 1,103,656	$ 776,768
Crude oil and condensate
OPERATING REVENUES
Operating revenues	0	0	0	48,722
Brokered natural gas
OPERATING REVENUES
Operating revenues	0	92,576	0	97,526
OPERATING EXPENSES
Operating expenses	0	80,082	0	85,032
Other
OPERATING REVENUES
Operating revenues	(14)	(121)	236	1,749
Transportation and gathering
OPERATING EXPENSES
Operating expenses	$ 141,689	$ 114,189	$ 279,022	$ 226,314