DERIVATIVE AND HEDGING INSTRUMENTS - Effect of Derivatives and Financial Instruments Designated as Hedging Instruments on Income and Equity (Details) - Designated as Hedging Instrument - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Other Comprehensive Income (Effective Portion)	$ 1,841	$ 44	$ (7,640)
Gain (Loss) Reclassified from Accumulated Other Comprehensive Income Into Income (Effective Portion)	(2,174)	(1,360)	(319)
Interest rate products | Interest expense
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Other Comprehensive Income (Effective Portion)	10,807	5,879	(4,764)
Gain (Loss) Reclassified from Accumulated Other Comprehensive Income Into Income (Effective Portion)	(2,174)	(1,360)	(319)
Foreign currency products
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Other Comprehensive Income (Effective Portion)	(2,378)	(2,085)	5,476
Gain (Loss) Reclassified from Accumulated Other Comprehensive Income Into Income (Effective Portion)	0	0	0
CAD term loan
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Other Comprehensive Income (Effective Portion)	(6,588)	(3,750)	(8,352)
Gain (Loss) Reclassified from Accumulated Other Comprehensive Income Into Income (Effective Portion)	$ 0	$ 0	$ 0