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Long-term investments - Narrative (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jan. 01, 2018
Dec. 31, 2018
Dec. 31, 2017
Investment [Line Items]      
Accumulated other comprehensive loss   $ 146,153 $ 94,294
Deferred tax expense (income)   38,392 (20,170)
Deficit   (547,839) (610,908)
Unrealized gain (loss) on investments, net of deferred tax expense   $ (6,221) $ 1,141
Increase (decrease) due to changes in accounting policy required by IFRSs | IFRS 9      
Investment [Line Items]      
Accumulated other comprehensive loss $ 46,000    
Deficit 46,000    
Increase (decrease) due to changes in accounting policy required by IFRSs | Long Term Investments | IFRS 9      
Investment [Line Items]      
Accumulated other comprehensive loss 35,000    
Deferred tax expense (income) (1,000)    
Deficit $ 35,000