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SHAREHOLDERS' EQUITY - Cumulative Share-based Compensation Expense (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2019
CAD ($)
Share-Based Compensation  
Cash withholding taxes $ 4,952
Equity-settled Long-term Incentive Plans  
Share-Based Compensation  
Recognized non-cash share-based compensation expense 44,263
Unrecognized cash share-based compensation expense 17,553
Fair value 61,816
PSU  
Share-Based Compensation  
Recognized non-cash share-based compensation expense 30,768
Unrecognized cash share-based compensation expense 11,971
Fair value $ 42,739
Weighted-average remaining contractual term (years) 1 year 8 months 12 days
RSU  
Share-Based Compensation  
Recognized non-cash share-based compensation expense $ 13,495
Unrecognized cash share-based compensation expense 5,582
Fair value $ 19,077
Weighted-average remaining contractual term (years) 1 year 4 months 24 days