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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% |

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