CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited) - USD ($) $ in Thousands		9 Months Ended
		Sep. 30, 2020	Sep. 30, 2019
Operating Activities
Net (loss) income including noncontrolling interest		$ (1,099,710)	$ 1,307,713
Adjustments to reconcile net (loss) income to net cash provided by continuing operations activities:
Loss (income) from discontinued operations		6,907	(1,027,632)
Depreciation, depletion and amortization		769,151	819,270
Previously suspended exploration costs		8,255	12,901
Amortization of undeveloped leases		21,951	21,680
Accretion of asset retirement obligations		31,213	29,824
Impairment of assets		1,206,284	0
Noncash restructuring expense		17,565	0
Deferred income tax (benefit) expense		(231,748)	50,597
Mark to market (gain) loss on contingent consideration		(29,476)	512
Mark to market (gain) loss on crude contracts		(104,463)	(100,076)
Long-term non-cash compensation		35,200	60,567
Net decrease (increase) in noncash operating working capital		(26,261)	40,257
Other operating activities, net		(26,837)	(62,386)
Net cash provided by continuing operations activities		578,031	1,153,227
Investing Activities
Property additions and dry hole costs		(648,725)	(995,509)
Property additions for King's Quay FPS		(74,936)	(13,637)
Acquisition of oil and gas properties		0	(1,212,949)
Proceeds from sales of property, plant and equipment		0	19,072
Net cash required by investing activities		(723,661)	(2,203,023)
Financing Activities
Borrowings on revolving credit facility		450,000	1,575,000
Repayment of revolving credit facility		(250,000)	(1,900,000)
Cash dividends paid		(76,790)	(125,437)
Distributions to noncontrolling interest		(43,673)	(97,510)
Early retirement of debt		(12,225)	0
Withholding tax on stock-based incentive awards		(7,094)	(6,991)
Debt issuance, net of cost		(613)	0
Capital lease obligation payments		(514)	(510)
Repurchase of common stock		0	(405,938)
Net cash (required) provided by financing activities		59,091	(961,386)
Cash Flows from Discontinued Operations
Operating activities	[1]	(1,202)	74,361
Investing activities	[1]	4,494	1,985,202
Financing activities	[1]	0	(4,914)
Net cash provided by discontinued operations	[1]	3,292	2,054,649
Cash transferred from discontinued operations to continuing operations		0	2,083,565
Effect of Exchange Rate on Cash and Cash Equivalents [Abstract]
Effect of exchange rate changes on cash and cash equivalents		(585)	2,593
Net increase (decrease) in cash and cash equivalents		(87,124)	74,976
Cash and cash equivalents at beginning of period		306,760	359,923
Cash and cash equivalents at end of period		$ 219,636	$ 434,899

[1] Net cash provided by discontinued operations is not part of the cash flow reconciliation. See Notes to Consolidated Financial Statements, page 7.