LONG-TERM DEBT AND LINES OF CREDIT - Effect on Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Debt Disclosure [Abstract]
Net unrealized gains (losses) recognized in other comprehensive income (loss)	$ 194	$ (40,265)	$ (53,332)	$ (96,997)
Net unrealized losses (gains) reclassified out of other comprehensive income (loss) to interest expense	$ 11,133	$ 1,193	$ 25,786	$ (1,530)