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Selling General and Administrative (Schedule of Selling General And Administrative Expenses) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Selling, General and Administrative [abstract] |  |
Selling, general and administration (note 26) | $ 21,088 | $ 19,320
Workers' participation | 1,400 | 1,750
Selling, general and administrative subtotal | 22,488 | 21,070
Share-based payments | 3,701 | 3,841
Total selling, general and administrative expense | $ 26,189 | $ 24,911

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