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Acquisition (Narrative) (Details) $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2018 USD ($) Boe / d MMBoe | Dec. 31, 2018 USD ($) MMBoe | Sep. 30, 2018 USD ($) | [1] | Jun. 30, 2018 USD ($) | [1] | Mar. 31, 2018 USD ($) | [1] | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2018 USD ($) MMBoe | Dec. 31, 2017 USD ($) | [2] | Dec. 31, 2016 USD ($) | [2]
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from sales to customers |  | $ 664,700 | [1] | $ 659,800 | $ 655,200 | $ 606,900 | $ 580,500 | $ 511,200 | $ 477,600 | $ 509,000 | $ 2,586,627 | $ 2,078,548 | $ 1,862,891
Income (loss) from continuing operations before income taxes |  | $ 106,200 | [1] | $ 146,800 | $ 82,300 | $ 97,000 | $ 2,400 | $ (63,600) | $ (21,900) | $ 154,900 | $ 432,338 | $ 71,802 | $ (493,115)
Petrobas America Inc [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Production capacity | Boe / d | 50,000 |  |  |  |  |  |  |  |  |  |  |  |
Proved reserves | MMBoe | 97 | 97 |  |  |  |  |  |  |  |  | 97 |  |
Acquisition, cash paid | $ 794,623 |  |  |  |  |  |  |  |  |  |  |  |
Percentage of interest in subsidiary transferred | 20.00% |  |  |  |  |  |  |  |  |  |  |  |
Revenue from sales to customers | $ 56,700 |  |  |  |  |  |  |  |  |  |  |  |
Income (loss) from continuing operations before income taxes | 36,500 |  |  |  |  |  |  |  |  |  |  |  |
Acquisition-related costs |  |  |  |  |  |  |  |  |  |  | $ 6,200 |  |
Petrobas America Inc [Member] | Sales Thresholds 2019 to 2025 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration, maximum | $ 150,000 | $ 150,000 |  |  |  |  |  |  |  |  | $ 150,000 |  |
MP Gulf Of Mexico LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Parent ownership interest | 80.00% | 80.00% |  |  |  |  |  |  |  |  | 80.00% |  |
Petrobas America Inc [Member] | MP Gulf Of Mexico LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling ownership interest | 20.00% | 20.00% |  |  |  |  |  |  |  |  | 20.00% |  |
[1] | 2018 includes noncontrolling interest in MP GOM.
[2] | Reclassified to conform to current presentation (see Note B).

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