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Share Capital and Employee Compensation Plans - Restricted Stock Unit Activity (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2017
USD ($)
shares
Dec. 31, 2016
USD ($)
shares
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Share-based compensation $ 3,077 $ 3,826
Restricted Share Units [member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Share-based compensation $ 2,000 $ 3,500
Other equity instruments outstanding. beginning (shares | shares 315,423 380,144
Granted (shares) | shares 184,187 164,132
Paid out (shares) | shares (222,006) (224,805)
Forfeited (shares) | shares (15,591) (4,048)
Other equity instruments outstanding, ending (shares) | shares 262,013 315,423
Fair value of other equity instruments outstanding, beginning $ 4,764 $ 2,495
Granted, fair value 2,698 2,919
Paid out, fair value (3,257) (3,769)
Forfeited, fair value (243) (61)
Change in value, fair value 136 3,180
Fair value of other equity instruments outstanding, ending $ 4,098 $ 4,764
First Anniversary of Grant [member] | Restricted Share Units [member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Award vesting (percent) 50.00%  
Second Anniversary of Grant [member] | Restricted Share Units [member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Award vesting (percent) 50.00%