Borrowings - Principal Payments (Table) (Details) - USD ($) $ in Thousands |
Jun. 30, 2016 |
Dec. 31, 2015 |
|---|---|---|
| BORROWINGS [Abstract] | ||
| June 30, 2017 | $ 24,403 | |
| June 30, 2018 | 30,471 | |
| June 30, 2019 | 414,914 | |
| June 30, 2020 | 59,199 | |
| June 30, 2021 | 28,623 | |
| June 30, 2022 and thereafter | 1,096,866 | |
| Total | $ 1,654,476 | $ 1,608,526 |