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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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