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Recent accounting pronouncements and future accounting policy changes (Details) - USD ($)
$ in Thousands
Jan. 01, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of expected impact of initial application of new standards or interpretations [line items]        
Provisions   $ 13,105 $ 9,700 $ 7,432
Bottom of range | IFRS 16        
Disclosure of expected impact of initial application of new standards or interpretations [line items]        
Right-of-use assets $ 9,000      
Lease liabilities 13,000      
Top of range | IFRS 16        
Disclosure of expected impact of initial application of new standards or interpretations [line items]        
Right-of-use assets 11,000      
Lease liabilities 15,000      
Deferred lease inducement        
Disclosure of expected impact of initial application of new standards or interpretations [line items]        
Provisions   $ 2,292    
Deferred lease inducement | IFRS 16        
Disclosure of expected impact of initial application of new standards or interpretations [line items]        
Provisions $ 2,000