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Summary of Significant Accounting Policies - Reconciliation of Cash, Cash Equivalents and Restricted Cash and Cash Equivalents (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Accounting Policies [Abstract]        
Cash and cash equivalents $ 113,686 $ 46,224 $ 53,740 $ 78,922
Restricted cash 35,854 12,034 14,451 22,358
Total cash and cash equivalents and restricted cash $ 149,540 $ 58,258 $ 68,191 $ 101,280