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Financial instruments (Details 6) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Financial instruments [Line Items]    
Effect on profit or loss for the period Derivative instruments $ (18,707) $ 16
Hedging reserve in equity before tax 1,982  
Debt [Member]    
Financial instruments [Line Items]    
Hedging liabilities (18,853) (3,893)
Effect on profit or loss for the period Derivative instruments (29,557) (13,615)
Hedging reserve in equity before tax 10,704 9,722
Debt [Member] | Cross currency swap contracts [Member]    
Financial instruments [Line Items]    
Hedging liabilities (22,771) (17,318)
Effect on profit or loss for the period Derivative instruments (25,363) (18,859)
Hedging reserve in equity before tax 2,592 1,541
Debt [Member] | Forward contract [member]    
Financial instruments [Line Items]    
Hedging assets 3,918 13,425
Effect on profit or loss for the period Derivative instruments (4,194) 5,244
Hedging reserve in equity before tax 8,112 8,181
Investment [Member]    
Financial instruments [Line Items]    
Hedging assets 16,381 18,146
Effect on profit or loss for the period Derivative instruments 17,146 19,911
Hedging reserve in equity before tax (765) (1,765)
Investment [Member] | Cross currency swap contracts [Member]    
Financial instruments [Line Items]    
Hedging liabilities (889)  
Effect on profit or loss for the period Derivative instruments (711)  
Hedging reserve in equity before tax (178)  
Investment [Member] | Forward contract [member]    
Financial instruments [Line Items]    
Hedging assets 17,270 18,146
Effect on profit or loss for the period Derivative instruments 17,857 19,911
Hedging reserve in equity before tax $ (587) $ (1,765)