CONDENSED CONSOLIDATED STATEMENT OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 219,532	$ 69,323
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation, depletion and amortization	282,986	294,406
Deferred income tax expense	16,529	46,513
(Gain) loss on sale of assets	(275)	139
Exploratory dry hole cost	0	2,011
Loss (gain) on derivative instruments	301,641	(17,783)
Net cash (paid) received in settlement of derivative instruments	(61,302)	33,529
Loss on equity method investments	0	59
Amortization of debt issuance costs	2,132	2,234
Stock-based compensation and other	24,259	34,204
Changes in assets and liabilities:
Accounts receivable, net	(69,985)	72,285
Income taxes	(49,557)	(27,020)
Inventories	2,489	(1,433)
Other current assets	(1,605)	(637)
Accounts payable and accrued liabilities	64,390	(25,118)
Interest payable	(12,888)	(13,691)
Other assets and liabilities	(3,683)	1,372
Net cash provided by operating activities	714,663	470,393
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(459,040)	(478,422)
Proceeds from sale of assets	319	335
Investment in equity method investments	0	(35)
Proceeds from sale of equity method investments	0	(9,424)
Net cash used in investing activities	(458,721)	(487,546)
CASH FLOWS FROM FINANCING ACTIVITIES
Borrowings from debt	100,000	123,000
Repayments of debt	(288,000)	(182,000)
Dividends paid	(127,813)	(119,532)
Tax withholdings on vesting of stock awards	(5,569)	(6,350)
Net cash used in financing activities	(321,382)	(184,882)
Net decrease in cash, cash equivalents and restricted cash	(65,440)	(202,035)
Cash, cash equivalents and restricted cash, beginning of period	151,691	213,783
Cash, cash equivalents and restricted cash, end of period	$ 86,251	$ 11,748