Borrowings - Principal Payments (Table) (Details) - USD ($) $ in Thousands |
Dec. 31, 2015 |
Dec. 31, 2014 |
|---|---|---|
| BORROWINGS [Abstract] | ||
| 2016 | $ 17,691 | |
| 2017 | 24,561 | |
| 2018 | 50,186 | |
| 2019 | 381,879 | |
| 2020 | 60,869 | |
| 2021 and thereafter | 1,073,340 | |
| Total | $ 1,608,526 | $ 1,644,582 |