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SUPPLEMENTAL DISCLOSURES - Restricted Cash Reconciliation (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Dec. 31, 2019
Disclosure Text Block Supplement [Abstract]        
Cash $ 73,128 $ 57,916 $ 41,813  
Restricted cash 34,663 33,467 26,090  
Total cash and restricted cash $ 107,791 $ 91,383 $ 67,903 $ 65,128