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DEBT - Components of Long-term Debt (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Line of Credit Facility    
Principal amount $ 401,018 $ 449,228
Less: Unamortized debt financing costs (8,677) (9,653)
Less: Current portion (65,277) (80,642)
Long-term debt, net 327,064 358,933
Secured Debt | $495 Million Credit Facility    
Line of Credit Facility    
Principal amount 308,818 334,288
Less: Unamortized debt financing costs (7,381) (8,222)
Secured Debt | $133 Million Credit Facility    
Line of Credit Facility    
Principal amount 92,200 114,940
Less: Unamortized debt financing costs $ (1,296) $ (1,431)