DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES (Impact of Financial Instruments on Statement of Operations) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Effect of the Company's derivative financial instruments on the income statement
Interest expense	$ 82,028	$ 64,568	$ 65,724
Interest Expense
Effect of the Company's derivative financial instruments on the income statement
Amount of gain (loss) reclassified from AOCI into earnings	1,135	(905)	(1,364)
Interest rate swap contracts
Effect of the Company's derivative financial instruments on the income statement
Amount of gain (loss) reclassified from AOCI into earnings	(1,200)
Cash Flow Hedging | Interest rate swap contracts
Effect of the Company's derivative financial instruments on the income statement
Amount of Gain (Loss) Recognized in OCI	$ 2,090	$ (726)	$ 831