CONDENSED CONSOLIDATED STATEMENT OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 84,284	$ 443,772
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation, depletion and amortization	194,757	188,405
Deferred income tax expense	52,089	152,647
Loss on sale of assets	170	1,500
Exploratory dry hole cost	2,011	16
Gain on derivative instruments	(60,036)	(71,906)
Net cash received in settlement of derivative instruments	19,423	68,377
Loss (earnings) on equity method investments	59	(7,334)
Distribution of earnings from equity method investments	0	8,750
Amortization of debt issuance costs	1,501	2,464
Stock-based compensation and other	23,463	21,058
Changes in assets and liabilities:
Accounts receivable, net	91,106	179,027
Income taxes	(25,547)	(5,577)
Inventories	(4,452)	(8,305)
Other current assets	(1,663)	(2,263)
Accounts payable and accrued liabilities	(36,453)	(35,867)
Interest payable	(97)	(216)
Other assets and liabilities	718	(22,611)
Net cash provided by operating activities	341,333	911,937
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(331,183)	(421,500)
Proceeds from sale of assets	275	2,346
Investment in equity method investments	(35)	(5,131)
Distribution of investment from equity method investments	0	758
Proceeds from sale of equity method investments	(9,424)	0
Net cash used in investing activities	(340,367)	(423,527)
CASH FLOWS FROM FINANCING ACTIVITIES
Borrowings from debt	0	95,000
Repayments of debt	0	(102,000)
Treasury stock repurchases	0	(156,638)
Dividends paid	(79,675)	(67,697)
Tax withholdings on vesting of stock awards	(6,332)	(10,557)
Capitalized debt issuance costs	0	7,411
Net cash used in financing activities	(86,007)	(249,303)
Net (decrease) increase in cash, cash equivalents and restricted cash	(85,041)	239,107
Cash, cash equivalents and restricted cash, beginning of period	213,783	2,287
Cash, cash equivalents and restricted cash, end of period	$ 128,742	$ 241,394