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Share Capital - Stock Option Activity (Details) - shares
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]          
Outstanding, beginning of period 1,983,674 1,745,018 1,721,472 1,484,218 1,484,218
Granted 22,044 4,100 321,444 384,538  
Exercised [1] (42,012) (110,039) (72,541) (209,850)  
Forfeited and expired (4,753) (1,905) (11,422) (21,732)  
Outstanding, end of period 1,958,953 1,637,174 1,958,953 1,637,174 1,721,472
Exercisable, end of period 1,200,614 1,052,955 1,200,614 1,052,955  
[1] During the nine months ended September 30, 2016, 30,176 stock options were exercised for the same number of common shares for cash (nine months ended September 30, 2015 – 62,469). In the same period, the Company issued 27,421 common shares (nine months ended September 30, 2015 – 100,465) for the cashless exercise of 42,365 stock options (nine months ended September 30, 2015 – 147,381).