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DERIVATIVES - Gains and Losses Related to Derivative Financial Instruments Not Designated as Hedging Instruments (Details) - Interest rate swaps - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Derivative Instruments, Gain (Loss) [Line Items]    
Gains (losses) on derivative financial instruments not designated as hedging instruments $ 387 $ (2,266)
Mark to market gain (loss) on interest rate derivatives    
Derivative Instruments, Gain (Loss) [Line Items]    
Gains (losses) on derivative financial instruments not designated as hedging instruments 498 (2,251)
Interest expense    
Derivative Instruments, Gain (Loss) [Line Items]    
Gains (losses) on derivative financial instruments not designated as hedging instruments $ (111) $ (15)