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Financial risk management - Summary of Exposure to Various Currencies Denominated in Foreign Currency (Details)
₺ in Thousands, € in Thousands, дин in Thousands, ¥ in Thousands, £ in Thousands, R$ in Thousands, $ in Thousands, $ in Thousands, $ in Thousands, $ in Thousands, in Thousands
Dec. 31, 2019
USD ($)
Dec. 31, 2019
CAD ($)
Dec. 31, 2019
EUR (€)
Dec. 31, 2019
RON ( )
Dec. 31, 2019
GBP (£)
Dec. 31, 2019
TRY (₺)
Dec. 31, 2019
CNY (¥)
Dec. 31, 2019
BBD ($)
Dec. 31, 2019
BRL (R$)
Dec. 31, 2019
AUD ($)
Jan. 01, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2018
CAD ($)
Dec. 31, 2018
EUR (€)
Dec. 31, 2018
RSD (дин)
Dec. 31, 2018
RON ( )
Dec. 31, 2018
GBP (£)
Dec. 31, 2018
TRY (₺)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2018
BRL (R$)
Dec. 31, 2018
AUD ($)
Dec. 31, 2017
USD ($)
Disclosure of nature and extent of risks arising from financial instruments [line items]                                            
Cash and cash equivalents $ 177,742                     $ 286,312                   $ 479,501
Marketable securities 3,828                     2,572                    
Accounts receivable and other 75,290                   $ 80,434 80,987                    
Accounts payable and accrued liabilities (139,104)                     (137,900)                    
Canadian dollar | Currency risk                                            
Disclosure of nature and extent of risks arising from financial instruments [line items]                                            
Cash and cash equivalents   $ 10,204                     $ 19,030                  
Marketable securities   4,971                     3,509                  
Accounts receivable and other   13,010                     23,672                  
Accounts payable and accrued liabilities   (59,583)                     (102,027)                  
Other non-current liability   (1,520)                     (10,064)                  
Net assets (25,259) $ (32,918)                   (48,292) $ (65,880)                  
Australian dollar | Currency risk                                            
Disclosure of nature and extent of risks arising from financial instruments [line items]                                            
Cash and cash equivalents                   $ 435                     $ 433  
Accounts receivable and other                   3                     3  
Accounts payable and accrued liabilities                   (8)                     (7)  
Net assets 302                 $ 430   302                 $ 429  
Euro | Currency risk                                            
Disclosure of nature and extent of risks arising from financial instruments [line items]                                            
Cash and cash equivalents | €     € 10,692                     € 6,861                
Accounts receivable and other | €     8,631                     15,552                
Accounts payable and accrued liabilities | €     (47,361)                     (34,488)                
Other non-current liability | €     (11,497)                     (9,191)                
Net assets (44,213)   € (39,535)                 (24,334)   € (21,266)                
Turkish lira | Currency risk                                            
Disclosure of nature and extent of risks arising from financial instruments [line items]                                            
Cash and cash equivalents | ₺           ₺ 9,930                       ₺ 2,664        
Accounts receivable and other | ₺           8,923                       54,772        
Accounts payable and accrued liabilities | ₺           (109,765)                       (44,516)        
Other non-current liability | ₺           0                       (15,877)        
Net assets (14,801)         ₺ (90,912)           (562)           ₺ (2,957)        
Chinese renminbi | Currency risk                                            
Disclosure of nature and extent of risks arising from financial instruments [line items]                                            
Cash and cash equivalents | ¥             ¥ 60                       ¥ 72      
Net assets 9           ¥ 60         11             ¥ 72      
Romanian lei | Currency risk                                            
Disclosure of nature and extent of risks arising from financial instruments [line items]                                            
Cash and cash equivalents |       1,599                       1,904            
Accounts receivable and other |       2,767                       4,487            
Accounts payable and accrued liabilities |       (1,421)                       (2,286)            
Net assets 690     2,945               1,010       4,105            
British pound | Currency risk                                            
Disclosure of nature and extent of risks arising from financial instruments [line items]                                            
Cash and cash equivalents | £         £ 371                       £ 923          
Net assets 491       £ 371             1,180         £ 923          
Brazilian real | Currency risk                                            
Disclosure of nature and extent of risks arising from financial instruments [line items]                                            
Cash and cash equivalents | R$                 R$ 1,101                     R$ 4,539    
Accounts receivable and other | R$                 6,356                     9,970    
Accounts payable and accrued liabilities | R$                 (1,639)                     (2,941)    
Net assets 1,447               R$ 5,818     2,982               R$ 11,568    
Barbados bajan | Currency risk                                            
Disclosure of nature and extent of risks arising from financial instruments [line items]                                            
Cash and cash equivalents               $ 16                            
Net assets $ 8             $ 16                            
Serbia, Dinars | Currency risk                                            
Disclosure of nature and extent of risks arising from financial instruments [line items]                                            
Cash and cash equivalents | дин                             дин 8,848              
Accounts receivable and other | дин                             8,386              
Accounts payable and accrued liabilities | дин                             (1,004)              
Net assets                       $ 157     дин 16,230