Cash and Cash Equivalents and Restricted Cash (Table) (Details) - USD ($) $ in Thousands |
Dec. 31, 2018 |
Dec. 31, 2017 |
Dec. 31, 2016 |
Dec. 31, 2015 |
|---|---|---|---|---|
| CASH AND CASH EQUIVALENTS [Abstract] | ||||
| Cash on hand and at banks | $ 131,432 | $ 127,625 | ||
| Short-term deposits and highly liquid funds | 6,450 | 7 | ||
| Restricted cash | 12,892 | 6,558 | $ 5,386 | |
| Cash and cash equivalents and restricted cash | $ 150,774 | $ 134,190 | $ 141,378 | $ 176,892 |