DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES (Narrative) (Details)	3 Months Ended	12 Months Ended
	Mar. 31, 2019 USD ($) settled_derivative derivative_instrument	Dec. 31, 2018 USD ($) settled_derivative
Derivative [Line Items]
Derivative liability fair value gross	$ 24,160,000	$ 16,517,000
Interest Rate Cap
Derivative [Line Items]
Interest rate swap agreements settled | settled_derivative	1
Interest rate derivatives
Derivative [Line Items]
Interest rate swap agreements settled | settled_derivative		4
Reduction in interest expense	$ 1,100,000
Credit Risk Contract
Derivative [Line Items]
Derivative liability fair value gross	26,200,000	$ 18,200,000
Designated as Hedging Instrument | Interest Rate Cap
Derivative [Line Items]
Notional amount	230,000,000.0
Payment received from derivative settlement	$ 200,000
Designated as Hedging Instrument | Interest rate derivatives
Derivative [Line Items]
Notional amount		250,000,000.0
Payment received from derivative settlement		15,800,000
Termination fee		300,000
Derivatives deferred effective portion of fair value change | derivative_instrument	3
Derivative change in fair value recognition period	8 years 9 months 18 days
Gain on derivative expected amount to be reclassified	$ 100,000
Fixed Interest Rate 2.96%, Maturing October 2019 | Designated as Hedging Instrument | Interest rate derivatives
Derivative [Line Items]
Notional amount		18,900,000.0
Fixed Interest Rate 1.66%, Maturing May 2020 | Designated as Hedging Instrument | Interest rate derivatives
Derivative [Line Items]
Notional amount		40,000,000.0
Derivative change in fair value recognition period	2 years 6 months
Fixed Interest Rate 1.14%, Maturing September 2021 | Designated as Hedging Instrument | Interest rate derivatives
Derivative [Line Items]
Notional amount		$ 119,400,000.0
Derivative change in fair value recognition period	1 year 1 month 6 days