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FINANCIAL RISK MANAGEMENT - Currency Risk Positions (Details) - Currency risk
$ in Thousands
Dec. 31, 2019
CAD ($)
$ / $
Dec. 31, 2018
CAD ($)
$ / $
Dec. 31, 2017
$ / $
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items]      
Notional amount | $ $ 8,000 $ 23,000  
Estimated usage 11.30% 31.00%  
Hedging price (in CAD per USD)     0.80
Floor price      
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items]      
Hedging price (in CAD per USD) 0.80 0.78  
Cap price      
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items]      
Hedging price (in CAD per USD) 0.76 0.74