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ACCOUNTING POLICIES - Share-Based Compensation (Details) - USD ($)
12 Months Ended
Feb. 17, 2017
Dec. 31, 2019
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 consecutive 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 volume weighted average trading price (VWAP)   50.00%
RSUs    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Awards threshold consecutive trading days   5 days