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Other Liabilities (Schedule of Other Liabilites) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Other Liabilities [abstract] |  |
Restricted share units (note 22) | $ 1,256 | $ 1,619
Performance share units (note 22) |  | 1,866
Other liabilities | 100 | 59
Other non-current liabilities | $ 1,356 | $ 3,544

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