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Share Capital and Employee Compensation Plans - Performance Share Unit Activity (Details) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 USD ($) shares | Dec. 31, 2016 USD ($) shares | Dec. 31, 2017 CAD ($) | Dec. 31, 2016 CAD ($)
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
Share-based compensation | $ 3,077 | $ 3,826 |  |
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 |  |  | $ 19.04 | $ 22.22
Share-based compensation | $ 1,000 | $ 600 |  |
Other equity instruments outstanding. beginning (shares | shares | 141,790 | 103,671 |  |
Granted (shares) | shares | 54,962 | 38,119 |  |
Paid out (shares) | shares | (30,408) |  |  |
Other equity instruments outstanding, ending (shares) | shares | 166,344 | 141,790 |  |
Fair value of other equity instruments outstanding, beginning | $ 2,152 | $ 683 |  |
Granted, fair value | 823 | 638 |  |
Paid out, fair value | (875) |  |  |
Change in value, fair value | 511 | 831 |  |
Fair value of other equity instruments outstanding, ending | $ 2,611 | $ 2,152 |  |

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