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FAIR VALUE OF FINANCIAL INSTRUMENTS - RECURRING (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Fair value of financial instruments    
Principal amount of floating rate debt $ 305,000 $ 449,228
Carrying Value    
Fair value of financial instruments    
Cash and cash equivalents 80,172 143,872
Restricted cash 315 35,807
Principal amount of floating rate debt 305,000 449,228
Fair value    
Fair value of financial instruments    
Cash and cash equivalents 80,172 143,872
Restricted cash 315 35,807
Principal amount of floating rate debt $ 305,000 $ 449,228