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, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) on derivative financial instruments not designated as hedging instruments	$ 4	$ (12)	$ 322	$ (2,529)
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	120	99	664	(2,316)
Interest expense
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) on derivative financial instruments not designated as hedging instruments	$ (116)	$ (111)	$ (342)	$ (213)