DERIVATIVES - Gains and Losses Related to Derivative Financial Instruments Not Designated as Hedging Instruments (Details) - Interest rate swaps - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) on derivative financial instruments not designated as hedging instruments	$ (69)	$ (251)	$ 318	$ (2,517)
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	46	(164)	544	(2,415)
Interest expense
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) on derivative financial instruments not designated as hedging instruments	$ (115)	$ (87)	$ (226)	$ (102)