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Significant Accounting Policies - Narrative (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | [1],[2] | Dec. 31, 2017 | [1],[2]
Significant Accounting Policies [Line Items] |  |  |
Impairment of assets | $ 0 | $ 20,000,000 | $ 0
Withholding tax on amounts repatriated | 5.00% |  |
PAI (Final) |  |  |
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] | 1 Reclassified to conform with current presentation (see Notes C and E). 2017 revenue is presented net of $58.9 million of transportation, gathering and processing costs as historically shown prior to the adoption of ASC 606 on January 1, 2018. See Notes to Consolidated Financial Statements, page 58.
[2] | Reclassified to conform with current presentation (see Note E)

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