CONDENSED CONSOLIDATED STATEMENT OF OPERATIONS (Unaudited) - 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
Operating revenues	$ 333,294	$ 418,051	$ 992,063	$ 1,521,943
(Loss) gain on derivative instruments	(42,253)	11,060	17,783	82,966
TOTAL OPERATING REVENUES	291,041	429,111	1,009,846	1,604,909
OPERATING EXPENSES
Direct operations	20,197	19,181	54,864	55,608
Transportation and gathering	146,982	145,681	425,563	424,703
Taxes other than income	3,615	4,607	10,705	14,094
Exploration	3,900	4,481	10,669	15,029
Depreciation, depletion and amortization	99,649	110,889	294,406	299,294
General and administrative	24,262	18,391	80,857	72,370
TOTAL OPERATING EXPENSES	298,605	303,230	877,064	881,098
Earnings (loss) on equity method investments	0	3,860	(59)	11,194
Gain (loss) on sale of assets	31	36	(139)	(1,464)
(LOSS) INCOME FROM OPERATIONS	(7,533)	129,777	132,584	733,541
Interest expense, net	14,389	13,554	43,143	40,302
Other expense	57	143	171	430
(Loss) income before income taxes	(21,979)	116,080	89,270	692,809
Income tax (benefit) expense	(7,018)	25,722	19,947	158,679
NET (LOSS) INCOME	$ (14,961)	$ 90,358	$ 69,323	$ 534,130
(Loss) earnings per share
Basic (in dollars per share)	$ (0.04)	$ 0.22	$ 0.17	$ 1.27
Diluted (in dollars per share)	$ (0.04)	$ 0.22	$ 0.17	$ 1.27
Weighted-average common shares outstanding
Basic (in shares)	398,580	412,456	398,500	419,199
Diluted (in shares)	398,580	414,462	400,628	421,101
Natural gas
OPERATING REVENUES
Operating revenues	$ 333,256	$ 418,133	$ 991,882	$ 1,521,789
Other
OPERATING REVENUES
Operating revenues	$ 38	$ (82)	$ 181	$ 154