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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