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Share-Based Compensation And Other Related Information - Performance Share Unit Activity (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
shares
Dec. 31, 2018
USD ($)
shares
Dec. 31, 2019
CAD ($)
Dec. 31, 2018
CAD ($)
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Share-based compensation $ 4,448 $ 2,957    
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     $ 24.88 $ 17.48
Share-based compensation $ 2,200 $ 1,000    
Other equity instruments outstanding. beginning (shares | shares 210,409 166,344    
Granted (shares) | shares 75,311 117,328    
Paid out (shares) | shares (38,119) (73,263)    
Forfeited (shares) | shares 0 0    
Other equity instruments outstanding, ending (shares) | shares 247,601 210,409    
Fair value of other equity instruments outstanding, beginning $ 3,091 $ 2,611    
Granted, fair value 1,784 1,532    
Paid out, fair value (903) (1,528)    
Forfeited, fair value 0 0    
Change in value, fair value 1,924 476    
Fair value of other equity instruments outstanding, ending $ 5,896 $ 3,091