CONDENSED CONSOLIDATED STATEMENT OF OPERATIONS (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
OPERATING REVENUES
Operating revenues	$ 633,424	$ 467,650
Gain on derivative instruments	8,257	5,577
TOTAL OPERATING REVENUES	641,681	473,227
OPERATING EXPENSES
Direct operations	18,334	20,070
Taxes other than income	5,847	7,190
Exploration	6,044	3,617
Depreciation, depletion and amortization	92,258	82,128
General and administrative	31,090	24,060
TOTAL OPERATING EXPENSES	290,906	254,140
Earnings (loss) on equity method investments	3,684	(994)
Loss on sale of assets	(1,500)	(41,049)
INCOME FROM OPERATIONS	352,959	177,044
Interest expense, net	12,181	20,058
Other expense	144	114
Income before income taxes	340,634	156,872
Income tax expense	77,871	39,641
NET INCOME	$ 262,763	$ 117,231
Earnings per share
Basic (in dollars per share)	$ 0.62	$ 0.26
Diluted (in dollars per share)	$ 0.62	$ 0.25
Weighted-average common shares outstanding
Basic (in shares)	423,116	459,715
Diluted (in shares)	425,189	461,549
Dividends per common share (in dollars per share)	$ 0.07	$ 0.06
Natural gas
OPERATING REVENUES
Operating revenues	$ 633,174	$ 412,108
Crude oil and condensate
OPERATING REVENUES
Operating revenues	0	48,722
Brokered natural gas
OPERATING REVENUES
Operating revenues	0	4,950
OPERATING EXPENSES
Operating expenses	0	4,950
Other
OPERATING REVENUES
Operating revenues	250	1,870
Transportation and gathering
OPERATING EXPENSES
Operating expenses	$ 137,333	$ 112,125