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Summary of Significant Accounting Policies - Property and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Depreciation expense related to property and equipment	$ 202,519	$ 183,808	$ 170,240
Accrued capital expenditures	2,700	$ 9,600
Impairment of long-lived assets to be disposed of	49,400		$ 8,000
Marine Operation Assets | Held-for-Sale
Property, Plant and Equipment [Line Items]
Estimated fair value of assets in the process of being sold	$ 14,000

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Future cash outflow to pay for purchases of fixed assets that have occurred.

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