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Significant Accounting Policies - Narrative (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Significant Accounting Policies [Line Items] |  |  |  |
Impairment of assets | $ 1,206,284,000 | $ 0 | $ 20,000,000 | [1]
Impairment of assets | $ 1,206,284,000 | $ 0 | $ 20,000,000 |
Withholding tax on amounts repatriated | 5.00% |  |  |
Petrobas America Inc |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Percentage of acquired entity reported | 100.00% |  |  |
Percentage of acquired entity noncontrolling interest reported | 20.00% |  |  |
Performance Based Restricted Stock |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Stock-based compensation, vesting period | 3 years |  |  |
Minimum |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Equity method investment, ownership percentage | 20.00% |  |  |
Minimum | Stock Options |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Stock-based compensation, vesting period | 2 years |  |  |
Maximum |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Equity method investment, ownership percentage | 50.00% |  |  |
Maximum | Stock Options |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Stock-based compensation, vesting period | 3 years |  |  |
[1] | Reclassified to conform with current presentation

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- Definition Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2420-110228 + Details
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- Definition The expense recorded to reduce the value of oil and gas assets consisting of proved properties and unproved properties as the estimate of future successful production from these properties is reduced. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2921-110230 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 360 -Section 35 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=66906256&loc=d3e66150-109466 + Details
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