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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Restricted Cash (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Dec. 31, 2018
Restricted Cash        
Cash and cash equivalents $ 136,233 $ 155,889    
Restricted cash - current 24,227 6,045    
Restricted cash - noncurrent 315 315    
Cash, cash equivalents and restricted cash $ 160,775 $ 162,249 $ 166,191 $ 202,761