DERIVATIVE FINANCIAL INSTRUMENTS - Effect of Interest Rate Derivatives (Details) - Interest rate swaps - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Derivative Instruments
Derivatives
Deferred gain (losses) included in AOCI (pretax)	$ (36,500)		$ (22,500)
Loss included in AOCI to be recognized in the next 12 months	(18,800)
Cash flow hedges
Derivatives
Unrealized loss recognized in AOCI, pretax	(16,152)	$ (9,053)
Deferred (loss) gain reclassified from AOCI to interest expense	$ (2,175)	$ 280