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Income taxes (Narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Line Items]      
Net deferred income tax liabilities $ 781,899 $ 815,259  
Deferred income tax assets 131,532 95,077  
Deferred income tax liabilities 913,431 910,336  
Unrecognized tax benefits $ 30,700 $ 30,100  
Local statutory tax rate 12.50% 12.50% 12.50%
Valuation allowance on tax assets $ 79,393 $ 74,361 $ 92,298
Ireland      
Income Tax Disclosure [Line Items]      
Net deferred income tax liabilities $ 812,372 $ 854,259  
Local statutory tax rate 12.50% 12.50% 12.50%
Valuation allowance on tax assets $ 7,536 $ 5,654  
United States      
Income Tax Disclosure [Line Items]      
Local statutory tax rate 21.00% 21.00% 22.00%
Valuation allowance on tax assets $ 50,805 $ 38,720  
The Netherlands      
Income Tax Disclosure [Line Items]      
Local statutory tax rate 25.00% 25.00% 25.00%
Valuation allowance on tax assets $ 4,278 $ 16,025  
Tax credit carry back period 1 year    
Tax credit carry forward period 6 years