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Borrowings - Principal Payments Due (Table) (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Long Term Debt By Maturity [Abstract]    
2019 $ 51,550  
2020 30,815  
2021 409,951  
2022 11,129  
2023 and thereafter 4,764  
Total borrowings $ 508,209 $ 510,632