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DERIVATIVE INSTRUMENTS - Pre-tax Gain (Loss) on Derivative Instruments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Derivative [Line Items]
Pre-tax gains (losses) on interest rate derivatives recognized	$ (8,281)		$ (8,986)
Pre-tax gains (losses) on interest rate derivatives recognized		$ 221		$ 2,165
Total gain (loss) on derivatives	280	89	(114)	158
Interest Rate Cap
Derivative [Line Items]
Pre-tax gains (losses) on interest rate derivatives recognized	(398)		(1,103)
Pre-tax gains (losses) on interest rate derivatives recognized		221		2,165
Interest Rate Swap
Derivative [Line Items]
Pre-tax gains (losses) on interest rate derivatives recognized	(7,883)		(7,883)
Pre-tax gains (losses) on interest rate derivatives recognized		0		0
Interest expense \| Interest Rate Cap
Derivative [Line Items]
Gain (loss) location of derivative instruments	269		(125)
Gain (loss) location of derivative instruments		89		158
Interest expense \| Interest Rate Swap
Derivative [Line Items]
Gain (loss) location of derivative instruments	129		129
Gain (loss) location of derivative instruments		0		0
Gain (loss) location of derivative instruments not designated	$ (118)	$ 0	$ (118)	$ 0