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Financial instruments (Details 6) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Financial instruments [Line Items]      
Effect on profit or loss for the period Derivative instruments $ 0 $ 0 $ (229)
Debt [Member] | Cross currency swap contracts [Member]      
Financial instruments [Line Items]      
Derivative instruments (17,318) 17,128  
Effect on profit or loss for the period Derivative instruments 16,636 33,696  
Hedging reserve in equity before tax 1,541 41  
Deferred tax hedging reserve in equity 0 0  
Hedging reserve in equity 1,541 41  
Debt [Member] | Forward contract [member]      
Financial instruments [Line Items]      
Derivative instruments 13,516 8,910  
Effect on profit or loss for the period Derivative instruments (3,004) 5,641  
Hedging reserve in equity before tax 8,256 2,170  
Deferred tax hedging reserve in equity 0 0  
Hedging reserve in equity 8,256 2,170  
Investments [Member] | Cross currency swap contracts [Member]      
Financial instruments [Line Items]      
Derivative instruments 18,146 (20,159)  
Effect on profit or loss for the period Derivative instruments 19,911 (20,256)  
Hedging reserve in equity before tax (1,765) 97  
Deferred tax hedging reserve in equity 0 0  
Hedging reserve in equity $ (1,765) $ 97