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Other Liabilities (Schedule of Other Liabilities) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Other Liabilities [abstract] |  |
Restricted share units (note 21) | $ 125 | $ 1,256
Other liabilities | 1,041 | 100
Other non-current liabilities | $ 1,166 | $ 1,356

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