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Basis of Presentation - Schedule of Cash and Restricted Cash (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Dec. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]        
Cash and Cash Equivalents $ 365 $ 15,617 $ 150,132  
Restricted Cash, Current Portion 220,386 735 733  
Restricted Cash, Less Current Portion 0 5,247 5,456  
Total Cash, Cash Equivalents, and Restricted Cash $ 220,751 $ 21,599 $ 156,321 $ 16,283