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Acquisitions (Narrative) (Details) $ in Thousands	1 Months Ended	3 Months Ended		6 Months Ended
Acquisitions (Narrative) (Details) $ in Thousands	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	May 31, 2019 MMBoe
Business Acquisition [Line Items]
Revenue from sales to customers		$ 285,745	$ 680,436	$ 886,303	$ 1,309,790
Income (loss) from continuing operations before income taxes		(417,906)	107,939	(1,013,279)	141,684
Impairment of assets		19,616	0	987,146	0
LLOG Exploration Offshore L.L.C. and LLOG Bluewater Holdings, L.L.C.
Business Acquisition [Line Items]
Proved reserves \| MMBoe						67
Cash consideration paid to LLOG	$ 1,236,165
Revenue from sales to customers		40,900		134,500
Income (loss) from continuing operations before income taxes		$ (31,600)		(437,900)
Impairment of assets				$ 432,900
LLOG Exploration Offshore L.L.C. and LLOG Bluewater Holdings, L.L.C. \| Sales Thresholds 2019 to 2022
Business Acquisition [Line Items]
Contingent consideration, maximum	200,000		200,000		200,000
LLOG Exploration Offshore L.L.C. and LLOG Bluewater Holdings, L.L.C. \| First Oil from Development Projects
Business Acquisition [Line Items]
Contingent consideration, maximum	$ 50,000		$ 50,000		$ 50,000