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Capital Structure and Financial Risk and Related Items - Financial risk factors (Details) - Foreign Currency - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
USD      
Financial risk factors      
Possible change increase (as a percentage) 10.00%    
Possible change decrease (as a percentage) (10.00%)    
Possible increase $ 2,853 $ 3,064 $ 5,625
Possible decrease $ (2,853) (3,064) (5,625)
EUR      
Financial risk factors      
Possible change increase (as a percentage) 2.00%    
Possible change decrease (as a percentage) (2.00%)    
Possible increase $ 934 985 506
Possible decrease $ (934) $ (985) $ (506)