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Financial Risk Management, Objectives and Policies - Contractual Maturities of Financial Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Contractual Maturities of Financial Liabilities |  |
Total Interest bearing loans | $ 857,439 | $ 801,926
Total Interest rate swaps | 550 | 3,111
Total interest bearing loans and interest rate swaps | 857,989 | 805,037
1 year |  |
Contractual Maturities of Financial Liabilities |  |
Interest bearing loans | 91,232 | 84,866
Interest rate swaps | 550 | 2,308
Total | 91,782 | 87,174
2 to 5 years |  |
Contractual Maturities of Financial Liabilities |  |
Interest bearing loans | 636,059 | 671,939
Interest rate swaps | 0 | 803
Total | 636,059 | 672,742
More than 5 years |  |
Contractual Maturities of Financial Liabilities |  |
Interest bearing loans | 130,148 | 45,121
Interest rate swaps | 0 | 0
Total | $ 130,148 | $ 45,121

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