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Consolidated Statements of Cash Flows (Parenthetical) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Dec. 31, 2019
Statement Of Cash Flows [Abstract]        
Cash $ 8,146 $ 8,052 $ 4,292 $ 2,263
Restricted cash 103,999 63,824 58,219 54,164
Total cash and restricted cash $ 112,145 $ 71,876 $ 62,511 $ 56,427