Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Income taxes (Narrative) (Details)

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Income taxes (Narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Tax Disclosure [Line Items]        
Net deferred income tax liabilities   $ 815,259 $ 666,317  
Deferred income tax assets   95,077 138,281  
Deferred income tax liabilities   910,336 804,598  
Unrecognized tax benefits   $ 30,100 $ 29,800  
Local statutory tax rate   12.50% 12.50% 12.50%
Valuation allowance on tax assets   $ 74,361 $ 92,298 $ 104,858
Ireland        
Income Tax Disclosure [Line Items]        
Net deferred income tax liabilities   $ 854,259 $ 711,635  
Local statutory tax rate   12.50% 12.50% 12.50%
Valuation allowance on tax assets   $ 5,654 $ 3,296  
United States        
Income Tax Disclosure [Line Items]        
Local statutory tax rate   21.00% 22.00% 35.70%
Valuation allowance on tax assets   $ 38,720 $ 57,145  
The Netherlands        
Income Tax Disclosure [Line Items]        
Local statutory tax rate   25.00% 25.00% 25.00%
Valuation allowance on tax assets   $ 16,025 $ 15,938  
Tax credit carry back period   1 year    
Tax credit carry forward period   6 years    
Subsequent Event | The Netherlands        
Income Tax Disclosure [Line Items]        
Local statutory tax rate 21.70%