DERIVATIVE AND HEDGING INSTRUMENTS - Summary of Notional Amounts of Derivative Instruments (Details) - Designated as Hedging Instrument [Member] - Cross Currency Interest Rate Swaps [Member] CAD in Thousands, $ in Thousands	Dec. 31, 2016 USD ($)	Dec. 31, 2016 CAD	Dec. 31, 2015 USD ($)	Dec. 31, 2015 CAD
Cash Flow Hedging [Member]
Derivative [Line Items]
Notional amount	$ 245,000	CAD 125,000	$ 200,000	CAD 90,000
Net Investment Hedging [Member]
Derivative [Line Items]
Notional amount		56,300		56,300
Notional amount		CAD 125,000		CAD 90,000