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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Cash and Restricted Cash (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Accounting Policies [Abstract]        
Cash and cash equivalents $ 123,445 $ 182,581 $ 77,580  
Restricted cash 3,110 2,921 3,851  
Total cash and cash equivalents and restricted cash $ 126,555 $ 185,502 $ 81,431 $ 93,216