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Consolidated Statements of Comprehensive Income (Loss) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Statement of comprehensive income [abstract]    
Net income for the year $ 10,537 $ 25,254
Items that may subsequently be re-classified to net income:    
Currency translation differences (15,205) 121
Items that will not subsequently be re-classified to net income:    
Gain on FVTOCI investments 8,159 16,902
Tax recovery on FVTOCI investments 335 514
Total other comprehensive (loss) income for the year (6,711) 17,537
Total comprehensive income for the year $ 3,826 $ 42,791