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Share-Based Compensation And Other Related Information - Performance Share Unit Activity (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2020
USD ($)
shares
Dec. 31, 2019
USD ($)
shares
Dec. 31, 2020
CAD ($)
Dec. 31, 2019
CAD ($)
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Share-based compensation $ 3,024 $ 4,448    
Performance Share Units [member]        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
PSU performance period 3 years      
Weighted average fair value at measurement date, other equity instruments granted     $ 39.51 $ 24.88
Share-based compensation $ 4,200 $ 2,200    
Other equity instruments outstanding. beginning (shares | shares 247,601 210,409    
Granted (shares) | shares 62,920 75,311    
Paid out (shares) | shares (54,962) (38,119)    
Forfeited (shares) | shares 0      
Other equity instruments outstanding, ending (shares) | shares 255,559 247,601    
Fair value of other equity instruments outstanding, beginning $ 5,896 $ 3,091    
Granted, fair value 1,942 1,784    
Paid out, fair value (2,626) (903)    
Forfeited, fair value 0      
Change in value, fair value 3,658 1,924    
Fair value of other equity instruments outstanding, ending $ 8,870 $ 5,896