DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING - Schedule of gain or loss recognized on derivative financial instruments (Details) - 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) recognized
Total Interest expense in which the effects of cash flow hedges are recorded	$ (10,904)	$ (9,450)	$ (32,665)	$ (30,068)
Cash flow hedges | Interest rate swaps
Derivative instruments, gain (loss) recognized
Gain (loss) recognized in Other comprehensive income on derivative financial instruments	504	(4,342)	(22,300)	(19,086)
Total Interest expense in which the effects of cash flow hedges are recorded	(10,904)	(9,450)	(32,665)	(30,068)
Cash flow hedges | Interest rate swaps | Interest expense
Derivative instruments, gain (loss) recognized
Loss reclassified from Other comprehensive income to Interest expense	$ (2,330)	$ (202)	$ (5,067)	$ (114)