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FAIR VALUE OF FINANCIAL INSTRUMENTS - RECURRING (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Fair value of financial instruments    
Principal amount of floating rate debt $ 475,433 $ 495,824
Carrying Value    
Fair value of financial instruments    
Cash and cash equivalents 136,233 155,889
Restricted cash 24,542 6,360
Principal amount of floating rate debt 475,433 495,824
Fair value    
Fair value of financial instruments    
Cash and cash equivalents 136,233 155,889
Restricted cash 24,542 6,360
Principal amount of floating rate debt $ 475,433 $ 495,824