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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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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.

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