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Income taxes (Narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Line Items]            
Net deferred income tax liabilities       $ 666,317 $ 522,714  
Deferred income tax assets       138,281 151,234  
Deferred income tax liabilities       804,598 673,948  
Unrecognized tax benefits       $ 29,800 $ 31,000  
Local statutory tax rate       12.50% 12.50% 12.50%
Valuation allowance on tax assets       $ 92,298 $ 104,858 $ 127,361
Ireland            
Income Tax Disclosure [Line Items]            
Net deferred income tax liabilities       $ 711,635 $ 572,165  
Local statutory tax rate       12.50% 12.50% 12.50%
Valuation allowance on tax assets       $ 3,296 $ 2,928  
United States            
Income Tax Disclosure [Line Items]            
Local statutory tax rate       22.00% 35.70% 36.30%
Valuation allowance on tax assets       $ 57,145 $ 59,983  
Tax Cuts And Jobs Act Of 2017, incomplete accounting, change in tax rate, provisional income tax expense (benefit)         $ 22,000  
The Netherlands            
Income Tax Disclosure [Line Items]            
Local statutory tax rate       25.00% 25.00% 25.00%
Valuation allowance on tax assets       $ 15,938 $ 18,240  
Tax credit carry back period       1 year    
Tax credit carry forward period       9 years    
Australia            
Income Tax Disclosure [Line Items]            
Valuation allowance on tax assets       $ 15,900 $ 23,700  
Subsequent Event            
Income Tax Disclosure [Line Items]            
Tax credit carry forward period     6 years      
Subsequent Event | The Netherlands            
Income Tax Disclosure [Line Items]            
Local statutory tax rate 20.50% 22.55%