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Supplemental Cash Flow Information - Cash and Cash Equivalents and Restricted Cash (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	$ 348,785	$ 353,241	$ 424,169
Restricted cash – current	11,144	56,777	40,493
Restricted cash – non-current	45,961	44,849	40,977
Total cash, cash equivalents and restricted cash	405,890	456,325	505,639	$ 552,174
Cash and cash equivalents
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	0	1,121	0
Cash and restricted cash
Cash and Cash Equivalents [Line Items]
Assets held for sale - restricted cash	$ 0	$ 337	$ 0

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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