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Share-Based Compensation And Other Related Information - Performance Share Unit Activity (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
shares
Dec. 31, 2017
USD ($)
shares
Dec. 31, 2018
CAD ($)
Dec. 31, 2017
CAD ($)
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Share-based compensation $ 2,957 $ 3,077    
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     $ 17.48 $ 19.04
Share-based compensation $ 1,000 $ 1,000    
Other equity instruments outstanding. beginning (shares | shares 166,344 141,790    
Granted (shares) | shares 117,328 54,962    
Paid out (shares) | shares (73,263) (30,408)    
Other equity instruments outstanding, ending (shares) | shares 210,409 166,344    
Fair value of other equity instruments outstanding, beginning $ 2,611 $ 2,152    
Granted, fair value 1,532 823    
Paid out, fair value (1,528) (875)    
Change in value, fair value 476 511    
Fair value of other equity instruments outstanding, ending $ 3,091 $ 2,611