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Supplemental Cash Flow Information - Schedule of Cash, Cash Equivalents and Restricted Cash (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Supplemental Cash Flow Elements [Abstract]        
Cash and cash equivalents $ 750,147 $ 61,576 $ 77,765  
Restricted cash 117,151 36,241 47,852  
Total Cash and cash equivalents and Restricted cash shown in the Consolidated Statements of Cash Flows $ 867,298 $ 97,817 $ 125,617 $ 123,942