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Shareholders' equity - Schedule of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Balance at period start $ 198,016 $ 421,566 $ 392,759  
Net current-period other comprehensive (loss) income (23,013) (65,378) (16,537)  
Balance at period end 221,162 198,016 421,566 $ 392,759
Accounting Standards Update [Extensible List]       Accounting Standards Update 2017-12 [Member]
Cumulative Effect, Period of Adoption, Adjustment        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Balance at period start     0  
Balance at period end       $ 0
Accumulated other comprehensive loss        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Balance at period start (584,860) (519,505) (502,266)  
Other comprehensive (loss) income before reclassifications (17,759) (22,267) (17,408)  
Net (income) loss reclassified from accumulated other comprehensive loss to net loss (5,149) (43,088) 949  
Net current-period other comprehensive (loss) income     (17,239)  
Net current-period other comprehensive (loss) income (22,908) (65,355) (16,459)  
Balance at period end (607,768) (584,860) (519,505) (502,266)
Accumulated other comprehensive loss | Cumulative Effect, Period of Adoption, Adjustment        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Balance at period start     (780)  
Balance at period end       (780)
    Foreign currency translation        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Balance at period start (587,804) (511,445) (499,277)  
Other comprehensive (loss) income before reclassifications (37,267) (76,359) (12,168)  
Net (income) loss reclassified from accumulated other comprehensive loss to net loss 0 0 0  
Net current-period other comprehensive (loss) income     (12,168)  
Net current-period other comprehensive (loss) income (37,267) (76,359)    
Balance at period end (625,071) (587,804) (511,445) (499,277)
    Foreign currency translation | Cumulative Effect, Period of Adoption, Adjustment        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Balance at period start     0  
Balance at period end       0
  Cash flow hedges        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Balance at period start     (1,640)  
Balance at period end       (1,640)
  Cash flow hedges        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Balance at period start 3,443 (7,520)    
Other comprehensive (loss) income before reclassifications 19,698 54,287 (5,185)  
Net (income) loss reclassified from accumulated other comprehensive loss to net loss (5,301) (43,324) 85  
Net current-period other comprehensive (loss) income     (5,880)  
Net current-period other comprehensive (loss) income 14,397 10,963    
Balance at period end 17,840 3,443 (7,520)  
  Cash flow hedges | Cumulative Effect, Period of Adoption, Adjustment        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Balance at period start     (780)  
Balance at period end       (780)
Post-employment benefits        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Balance at period start (499) (540) (1,349)  
Other comprehensive (loss) income before reclassifications (190) (195) (55)  
Net (income) loss reclassified from accumulated other comprehensive loss to net loss 152 236 864  
Net current-period other comprehensive (loss) income     809  
Net current-period other comprehensive (loss) income (38) 41    
Balance at period end $ (537) $ (499) (540) (1,349)
Post-employment benefits | Cumulative Effect, Period of Adoption, Adjustment        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Balance at period start     $ 0  
Balance at period end       $ 0
Venezuela | Post-employment benefits        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Salary period paid upon employee leaving 30 days