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Acquisition (Narrative) (Details) $ in Thousands	1 Months Ended		3 Months Ended			9 Months Ended
	Jun. 30, 2019 USD ($)	Dec. 31, 2018 USD ($) MMBoe	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	[1]	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	[1]	May 31, 2019 MMBoe
Business Acquisition [Line Items]
Revenue from sales to customers			$ 750,337	$ 475,458		$ 2,060,127	$ 1,330,399
Income (loss) from continuing operations before income taxes			177,116	$ 73,968		318,800	$ 30,347
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 PAI	$ 1,226,300	$ 1,226,261
Revenue from sales to customers			126,400			159,800
Income (loss) from continuing operations before income taxes			29,200			34,300
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
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
Petrobas America Inc
Business Acquisition [Line Items]
Proved reserves | MMBoe		97
Cash consideration paid to PAI		$ 775,413
Percentage of interest in subsidiary transferred		20.00%
Revenue from sales to customers			263,700			710,200
Income (loss) from continuing operations before income taxes			$ 99,600			$ 369,700
Petrobas America Inc | Sales Thresholds 2019 to 2022
Business Acquisition [Line Items]
Contingent consideration, maximum		$ 150,000
MP Gulf Of Mexico LLC
Business Acquisition [Line Items]
Parent ownership interest		80.00%
Petrobas America Inc | MP Gulf Of Mexico LLC
Business Acquisition [Line Items]
Noncontrolling ownership interest		20.00%
[1] Reclassified to conform to current presentation (see Note A).

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