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Long-Term Debt and Financial Liabilities, Maturities of Long-Term Debt (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Annual Principal Payments [Abstract]    
June 30, 2019 $ 22,303  
June 30, 2020 52,743  
June 30, 2021 42,826  
June 30, 2022 52,449  
Thereafter 30,187  
Total $ 200,508 $ 196,450