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Consolidated Statements of Comprehensive Income Statement - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Statement of comprehensive income [abstract]    
Net earnings for the period $ 12,041 $ 123,451
Items that may be reclassified subsequently to net earnings:    
Unrealized net gains on short-term investments (net of $nil tax in 2018 and 2017) 993 810
Reclassification adjustment for realized (gains) losses on short-term investments to earnings (788) 361
Total comprehensive earnings for the year 12,246 124,622
Total comprehensive earnings attributable to:    
Equity holders of the Company 10,499 122,162
Non-controlling interests $ 1,747 $ 2,460