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The Nature of Expenses - Employee benefits expense summarized by function (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
IFRS Statement [Line Items]      
Employee benefits expense $ 95,117 $ 106,926 $ 104,340
Cost of Revenues [Member]      
IFRS Statement [Line Items]      
Employee benefits expense 5,597 6,512 5,223
Operating Expenses [Member]      
IFRS Statement [Line Items]      
Employee benefits expense $ 89,520 $ 100,414 $ 99,117