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ACCOUNTING POLICIES - Share-Based Compensation (Details)
12 Months Ended
Dec. 31, 2018
USD ($)
DSUs  
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Incremental fair value granted, modified share-based payment arrangements $ 0
Awards threshold trading days 5 days
PSUs  
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Incremental fair value granted, modified share-based payment arrangements $ 0
Awards threshold consecutive trading days 5 days
PSUs | Subsequent to December 2017  
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Awards percentage based on monte carlo simulation model 50.00%
Awards percentage based on volume weighted average trading price (VWAP) 50.00%
PSUs market performance conditions | Subsequent to December 2017  
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Awards percentage based on monte carlo simulation model 50.00%
PSUs non-market performance conditions | Subsequent to December 2017  
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Awards percentage based on monte carlo simulation model 50.00%
RSUs  
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Awards threshold trading days 5 days