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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 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Derivative Instruments, Gain (Loss) [Line Items]        
Gains (losses) on derivative financial instruments not designated as hedging instruments $ (12) $ 390 $ (2,529) $ 740
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 99 367 (2,316) 717
Interest expense        
Derivative Instruments, Gain (Loss) [Line Items]        
Gains (losses) on derivative financial instruments not designated as hedging instruments $ (111) $ 23 $ (213) $ 23