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Financial risk management, objectives and policies, Liquidity risk (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Contractual Maturities of Financial Liabilities [Abstract]    
Interest bearing loans $ 996,301 $ 1,177,298
Interest rate swaps 11,629 2,424
Total 1,007,929 1,179,722
1 Year [Member]    
Contractual Maturities of Financial Liabilities [Abstract]    
Interest bearing loans 140,707 146,574
Interest rate swaps 3,523 593
Total 144,230 147,167
2 to 5 Years [Member]    
Contractual Maturities of Financial Liabilities [Abstract]    
Interest bearing loans 855,593 723,031
Interest rate swaps 8,105 1,832
Total 863,699 724,863
More than 5 Years [Member]    
Contractual Maturities of Financial Liabilities [Abstract]    
Interest bearing loans 0 307,692
Interest rate swaps 0 0
Total $ 0 $ 307,692