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Summary of Significant Accounting Policies - Supplemental Cash and Non Cash Information (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Supplemental disclosure of cash flow information: |  |  |
Cash paid for reorganization items, net | $ 24,553 | $ 0 | $ 0
Interest payments | 84,823 | 142,664 | 132,995
Income tax receipts | 0 | (1,794) | 0
Supplemental disclosure of non-cash transactions: |  |  |
Capitalized stock-based compensation | 2,860 | 5,766 | 4,533
Asset retirement obligation capitalized | 2,358 | 6,883 | 1,452
Asset retirement obligation removed due to divestiture | (2,213) | (30,146) | 0
Interest capitalized | 907 | 3,372 | 4,470
Pre-petition revolver principal transfer to DIP credit facility | 157,500 | 0 | 0
Fair value of contingent consideration asset on date of divestiture | 23,090 | (1,137) | 0
Foreign currency translation gain (loss) on equity method investments | $ 3,833 | $ 9,193 | $ (15,487)

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