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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

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