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Assets and Liabilities Measured at Fair Value - Nonrecurring Fair Value Measurements (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | [1],[2]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Net Book Value Prior to Impairment |  | $ 57,690,000 |  |
Total Pretax Impairment | $ 0 | 20,000,000 | [1],[2] | $ 0
Level 1 | United States Midland |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair value impaired charges |  | 0 |  |
Level 2 | United States Midland |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair value impaired charges |  | 0 |  |
Level 3 | United States Midland |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair value impaired charges |  | $ 37,690,000 |  |
[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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