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Summary of Significant Accounting Policies - Property and Equipment (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Property, Plant and Equipment [Line Items] |  |  |
Depreciation expense related to property and equipment | $ 225,256 | $ 218,107 | $ 202,519
Accrued capital expenditures | 11,300 | 10,000 |
Asset impairment charges | 8,282 | $ 13,892 | 49,375
Estimated fair value of assets in the process of being sold |  |  | $ 14,000
Marine Operation Assets | Held-for-Sale |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated fair value of assets in the process of being sold | $ 5,000 |  |

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