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Financial risk management, objectives and policies - Contractual maturities of financial liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Contractual Maturities of Financial Liabilities    
Total Interest bearing loans $ 1,177,298 $ 857,439
Total Interest rate swaps 2,424 550
Total interest bearing loans and interest rate swaps 1,179,722 857,989
1 year    
Contractual Maturities of Financial Liabilities    
Interest bearing loans 146,574 91,232
Interest rate swaps 593 550
Total 147,167 91,782
2 to 5 years    
Contractual Maturities of Financial Liabilities    
Interest bearing loans 723,031 636,059
Interest rate swaps 1,832 0
Total 724,863 636,059
More than 5 years    
Contractual Maturities of Financial Liabilities    
Interest bearing loans 307,692 130,148
Interest rate swaps 0 0
Total $ 307,692 $ 130,148