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Financial risk management (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Interest Rate Risk [Member]      
Financial risk management [Abstract]      
Forecasted increase in benchmark interest rate 0.25%    
Forecasted loss on cash flow hedges due to increase in benchmark interest rate $ (2,897) $ (2,745) $ (2,731)
Forecasted increase in hedging reserves due to increase in benchmark interest rate $ 22,130 $ 27,570 $ 32,928
Interest Rate Risk [Member] | Euros [Member]      
Financial risk management [Abstract]      
Percentage of notional amount of debt hedged 100.00%    
Maturity date 2030    
Interest Rate Risk [Member] | Euros [Member] | Bottom of Range [Member]      
Financial risk management [Abstract]      
Interest rate 0.00%    
Interest Rate Risk [Member] | Euros [Member] | Top of Range [Member]      
Financial risk management [Abstract]      
Interest rate 4.87%    
Interest Rate Risk [Member] | U.S. Dollars [Member]      
Financial risk management [Abstract]      
Maturity date 2034    
Interest Rate Risk [Member] | U.S. Dollars [Member] | Bottom of Range [Member]      
Financial risk management [Abstract]      
Percentage of notional amount of debt hedged 72.00%    
Interest rate 1.98%    
Interest Rate Risk [Member] | U.S. Dollars [Member] | Top of Range [Member]      
Financial risk management [Abstract]      
Percentage of notional amount of debt hedged 100.00%    
Interest rate 5.27%    
Currency Risk [Member]      
Financial risk management [Abstract]      
Net Euro exposure percentage for next fiscal year 100.00%    
Net Euro exposure percentage for following fiscal period 75.00%