DERIVATIVE AND HEDGING INSTRUMENTS - Summary of Derivative Notional Amounts (Details) - Cross Currency Interest Rate Swaps [Member] CAD in Thousands, $ in Thousands	Mar. 31, 2017 USD ($)	Mar. 31, 2017 CAD	Dec. 31, 2016 USD ($)	Dec. 31, 2016 CAD
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]
Derivative [Line Items]
Notional amount	$ 245,000	CAD 125,000	$ 245,000	CAD 125,000
Designated as Hedging Instrument [Member] | Net Investment Hedging [Member]
Derivative [Line Items]
Notional amount		55,889		56,300
Derivative liability, notional amount		125,000		125,000
Not Designated as Hedging Instrument [Member] | Net Investment Hedging [Member]
Derivative [Line Items]
Notional amount		CAD 411		CAD 0