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Financial risk management, objectives and policies, Liquidity risk (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Contractual Maturities of Financial Liabilities [Abstract]    
Interest bearing loans $ 494,552 $ 996,301
Interest rate swaps 20,956 11,629
Total 515,507 1,007,929
1 Year [Member]    
Contractual Maturities of Financial Liabilities [Abstract]    
Interest bearing loans 19,110 140,707
Interest rate swaps 8,541 3,523
Total 27,651 144,230
2 to 5 Years [Member]    
Contractual Maturities of Financial Liabilities [Abstract]    
Interest bearing loans 475,441 855,593
Interest rate swaps 12,415 8,105
Total 487,857 863,699
More than 5 Years [Member]    
Contractual Maturities of Financial Liabilities [Abstract]    
Interest bearing loans 0 0
Interest rate swaps 0 0
Total $ 0 $ 0