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Significant Accounting Policies - Cash, Cash Equivalent, and Restricted Cash (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Accounting Policies [Abstract]        
Cash and cash equivalents $ 48,198 $ 137,060 $ 37,575  
Restricted cash 143,569 128,017 126,544  
Total cash, cash equivalents and restricted cash $ 191,767 $ 265,077 $ 164,119 $ 175,214