Quarterly report pursuant to Section 13 or 15(d)

CASH, CASH EQUIVALENTS AND RESTRICTED CASH - Reconciliation of Cash and Cash Equivalents and Restricted Cash (Details)

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CASH, CASH EQUIVALENTS AND RESTRICTED CASH - Reconciliation of Cash and Cash Equivalents and Restricted Cash (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Dec. 31, 2019
Cash and Cash Equivalents [Abstract]        
Cash and cash equivalents $ 535,253 $ 312,799 $ 104,355  
Restricted cash 2,177   30,484  
Total $ 537,430 $ 324,876 $ 134,839 $ 96,440