CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Operating Activities
Net income (loss) including noncontrolling interest		$ 47,528	$ (1,262,445)	$ 1,253,302
Adjustments to reconcile net income (loss) to net cash provided by continuing operations activities
Depreciation, depletion and amortization		795,105	987,239	1,147,842
Impairment of assets		196,296	1,206,284	0
Mark to market loss on derivative instruments		112,113	69,310	33,364
Mark to market loss (gain) on contingent consideration		63,147	(13,783)	8,672
Long-term non-cash compensation		63,382	46,558	76,958
Accretion of asset retirement obligations		46,613	42,136	40,506
Amortization of undeveloped leases		18,925	26,743	27,973
Previously suspended exploration costs		17,339	21,099	12,840
Deferred income tax (benefit) expense		(4,146)	(278,042)	28,530
Loss (income) from discontinued operations		1,225	7,151	(1,064,487)
Net decrease (increase) in noncash working capital		118,457	(32,027)	(16,887)
Other operating activities, net		(53,821)	(35,080)	(59,508)
Noncash restructuring expense		0	17,565	0
Net cash provided by continuing operations activities		1,422,163	802,708	1,489,105
Investing Activities
Property additions and dry hole costs		(670,479)	(759,809)	(1,244,069)
Proceeds from sales of property, plant and equipment		270,503	13,750	20,382
Property additions for King's Quay FPS		(17,734)	(112,961)	(100,202)
Acquisition of oil and natural gas properties		0	0	(1,212,315)
Net cash required by investing activities		(417,710)	(859,020)	(2,536,204)
Financing Activities
Retirement of debt		(876,358)	(12,225)	(521,332)
Debt issuance, net of cost		541,913	(613)	542,394
Repayment of revolving credit facility		(365,000)	(250,000)	(2,050,000)
Borrowings on revolving credit facility		165,000	450,000	1,725,000
Distributions to noncontrolling interest		(137,517)	(43,673)	(128,158)
Cash dividends paid		(77,204)	(95,989)	(163,669)
Early redemption of debt cost		(39,335)	0	(26,626)
Withholding tax on stock-based incentive awards		(5,209)	(7,094)	(6,991)
Capital lease obligation payments		(803)	(695)	(688)
Repurchase of common stock		0	0	(499,924)
Net cash (required) provided by financing activities		(794,513)	39,711	(1,129,994)
Cash Flows from Discontinued Operations
Operating activities	[1]	0	(1,202)	73,783
Investing activities	[1]	0	4,494	2,022,034
Financing activities	[1]	0	0	(4,914)
Net cash provided by discontinued operations	[1]	0	3,292	2,090,903
Cash from discontinued operations	[1]	0	18,438	2,120,397
Effect of exchange rate changes on cash and cash equivalents		638	2,009	3,533
Net increase in cash and cash equivalents		210,578	3,846	(53,163)
Cash and cash equivalents at beginning of period		310,606	306,760	359,923
Cash and cash equivalents at end of period		$ 521,184	$ 310,606	$ 306,760

[1] Net cash provided by discontinued operations are not part of the cash flow reconciliation.