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FAIR VALUE OF FINANCIAL INSTRUMENTS - RECURRING (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Fair value of financial instruments    
Principal amount of floating rate debt $ 367,025 $ 449,228
Carrying Value    
Fair value of financial instruments    
Cash and cash equivalents 116,280 143,872
Restricted cash 44,921 35,807
Principal amount of floating rate debt 367,025 449,228
Fair value    
Fair value of financial instruments    
Cash and cash equivalents 116,280 143,872
Restricted cash 44,921 35,807
Principal amount of floating rate debt $ 367,025 $ 449,228