DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING - Schedule of gain or loss recognized on derivative financial instruments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Derivative instruments, gain (loss) recognized
Total Interest expense in which the effects of cash flow hedges are recorded	$ (10,749)	$ (9,766)	$ (21,761)	$ (20,618)
Cash flow hedges | Interest rate swaps
Derivative instruments, gain (loss) recognized
Loss recognized in Other comprehensive income on derivative financial instruments	(2,981)	(9,247)	(22,804)	(14,744)
Total Interest expense in which the effects of cash flow hedges are recorded	(10,749)	(9,766)	(21,761)	(20,618)
Cash flow hedges | Interest rate swaps | Interest expense
Derivative instruments, gain (loss) recognized
(Loss) gain reclassified from Other comprehensive income to Interest expense	$ (1,958)	$ 27	$ (2,737)	$ 88