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Acquisitions (Narrative) (Details) $ in Thousands | 1 Months Ended | 3 Months Ended | 7 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2019 USD ($) | Mar. 31, 2020 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2019 USD ($) | May 31, 2019 MMBoe
Business Acquisition [Line Items] |  |  |  |  |
Revenue from sales to customers |  | $ 600,558 | $ 629,354 |  |
Income (loss) from continuing operations before income taxes |  | (595,373) | 33,745 |  |
Impairment of assets |  | 967,530 | $ 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 PAI | $ 1,236,200 |  |  | $ 1,236,165 |
Revenue from sales to customers |  | 93,700 |  |  |
Income (loss) from continuing operations before income taxes |  | (406,300) |  |  |
Impairment of assets |  | $ 413,200 |  |  |
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 |
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 |

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