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Summary of Significant Accounting Policies - Cash, Cash Equivalents and Restricted Cash (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Dec. 31, 2018
Cash, Cash Equivalents and Restricted Cash        
Cash and cash equivalents $ 89,135 $ 83,001    
Restricted cash 15,635 20,600    
Total cash, cash equivalents and restricted cash 104,770 103,601 $ 106,881 $ 59,974
Marketing funds        
Cash, Cash Equivalents and Restricted Cash        
Cash and cash equivalents 89,135 83,001    
Restricted cash 15,635 20,600    
Total cash, cash equivalents and restricted cash $ 104,770 $ 103,601