LONG-TERM DEBT AND LINES OF CREDIT - Effect on Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Debt Disclosure [Abstract]
Net unrealized losses recognized in other comprehensive income (loss)	$ (5,630)	$ (42,222)	$ (53,526)	$ (56,731)
Net unrealized losses (gains) reclassified out of other comprehensive income (loss) to interest expense	$ 9,982	$ (893)	$ 14,653	$ (2,723)