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Segment Information - Reconciliation of Segment Information, (Loss) Earnings Before Income Tax (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
	May 02, 2018	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Total Segment Income Before Income Taxes for Reportable Business Segments		$ 233,485	$ 30,292	$ 157,275	$ 789,532
Other Income (Expense)		99	(575)	681	5,917
Gain on Certain Asset Sales	$ 286	387	3,280	(2,699)	14,622
Loss on Debt Extinguishment		(77)	(23,413)	(7,614)	(39,048)
Impairment of Other Intangible Assets		0	(18,650)	0	(18,650)
Earnings Before Income Tax		233,485	30,292	157,275	789,532
Operating Segments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Total Segment Income Before Income Taxes for Reportable Business Segments		232,674	69,920	158,828	205,264
Earnings Before Income Tax		232,674	69,920	158,828	205,264
Corporate, Non-Segment
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Total Segment Income Before Income Taxes for Reportable Business Segments		811	(39,628)	(1,553)	584,268
Other Income (Expense)		501	(575)	1,531	5,917
Gain on Certain Asset Sales		387	3,010	4,530	12,386
Gain on Previously Held Equity Interest		0	0	0	623,663
Loss on Debt Extinguishment		(77)	(23,413)	(7,614)	(39,048)
Impairment of Other Intangible Assets		0	(18,650)	0	(18,650)
Earnings Before Income Tax		811	(39,628)	(1,553)	584,268
Total E&P | Operating Segments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Total Segment Income Before Income Taxes for Reportable Business Segments		188,260	42,125	81,830	141,935
Earnings Before Income Tax		$ 188,260	$ 42,125	$ 81,830	$ 141,935

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Amount of gain (loss) on sale or disposal of an equity method investment.

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