CONDENSED CONSOLIDATED STATEMENT OF OPERATIONS (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
OPERATING REVENUES
Operating revenues	$ 418,051	$ 548,710	$ 1,521,943	$ 1,473,475
Gain (loss) on derivative instruments	11,060	(3,537)	82,966	(1,628)
TOTAL OPERATING REVENUES	429,111	545,173	1,604,909	1,471,847
OPERATING EXPENSES
Direct operations	19,181	17,030	55,608	52,757
Taxes other than income	4,607	2,852	14,094	15,434
Exploration	4,481	10,049	15,029	68,166
Depreciation, depletion and amortization	110,889	121,172	299,294	288,210
General and administrative	18,391	20,724	72,370	66,013
TOTAL OPERATING EXPENSES	303,230	394,766	881,098	1,024,865
Earnings (loss) on equity method investments	3,860	(11)	11,194	(1,009)
Gain (loss) on sale of assets	36	25,655	(1,464)	(14,850)
INCOME FROM OPERATIONS	129,777	176,051	733,541	431,123
Interest expense, net	13,554	14,191	40,302	57,577
Other expense	143	115	430	347
Income before income taxes	116,080	161,745	692,809	373,199
Income tax expense	25,722	39,408	158,679	91,201
NET INCOME	$ 90,358	$ 122,337	$ 534,130	$ 281,998
Earnings per share
Basic (in dollars per share)	$ 0.22	$ 0.28	$ 1.27	$ 0.63
Diluted (in dollars per share)	$ 0.22	$ 0.28	$ 1.27	$ 0.62
Weighted-average common shares outstanding
Basic (in shares)	412,456	440,772	419,199	450,445
Diluted (in shares)	414,462	443,110	421,101	452,313
Natural gas
OPERATING REVENUES
Operating revenues	$ 418,133	$ 440,835	$ 1,521,789	$ 1,217,603
Crude oil and condensate
OPERATING REVENUES
Operating revenues	0	0	0	48,722
Brokered natural gas
OPERATING REVENUES
Operating revenues	0	105,849	0	203,375
OPERATING EXPENSES
Operating expenses	0	93,405	0	178,437
Other
OPERATING REVENUES
Operating revenues	(82)	2,026	154
Transportation and gathering
OPERATING EXPENSES
Operating expenses	$ 145,681	$ 129,534	$ 424,703	$ 355,848