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Cash, Cash Equivalents and Restricted Cash (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Dec. 31, 2019
Cash and Cash Equivalents [Abstract]        
Term of restriction 1 year      
Cash and cash equivalents $ 63,997 $ 137,060 $ 315,808 $ 37,575
Restricted cash 137,997 128,017 126,219 126,544
Total cash, cash equivalents and restricted cash $ 201,994 $ 265,077 $ 442,027 $ 164,119