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Share Capital and Employee Compensation Plans (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
USD ($)
vesting_period
day
shares
Dec. 31, 2016
USD ($)
Disclosure of share-based payment arrangements [Abstract]    
Shares issued as compensation (Note 25) | $ $ 2,020 $ 2,365
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Number of shares reserved for issue under options and contracts for sale of shares (shares) | shares 6,461,470  
Long Term Incentive Plan [member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Maximum term for options granted 7 years  
Common share grants, no trading period 2 years  
Number of equal annual vesting instalments | vesting_period 2  
Compensation Plan [Member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Number of trading days included in average for calculation of option exercise price | day 5  
Maximum term for options granted 10 years