DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES (Schedule of Financial Instruments Included in Balance Sheet) (Details) - Designated as Hedging Instrument - Accounts Payable and Accrued Liabilities - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Fair value of derivative instruments
Derivative liabilities	$ 19,214	$ 4,217
Interest Rate Swaps & Caps
Fair value of derivative instruments
Derivative liabilities	3,099	2,292
Forward Starting Swaps
Fair value of derivative instruments
Derivative liabilities	$ 16,115	$ 1,925