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FAIR VALUE OF FINANCIAL INSTRUMENTS - RECURRING (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Fair value of financial instruments    
Principal amount of floating rate debt $ 449,228 $ 495,824
Carrying Value    
Fair value of financial instruments    
Cash and cash equivalents 143,872 155,889
Restricted cash 35,807 6,360
Principal amount of floating rate debt 449,228 495,824
Fair value    
Fair value of financial instruments    
Cash and cash equivalents 143,872 155,889
Restricted cash 35,807 6,360
Principal amount of floating rate debt $ 449,228 $ 495,824