Prepaid Expenses and Other Current Assets (Table) (Details) - USD ($) $ in Thousands |
Dec. 31, 2018 |
Dec. 31, 2017 |
|---|---|---|
| PREPAID EXPENSES AND OTHER CURRENT ASSETS [Abstract] | ||
| Prepaid voyage and operating costs | $ 9,261 | $ 8,022 |
| Claims receivable | 22,224 | 12,307 |
| Prepaid other taxes | 2,682 | 4,520 |
| Advances for working capital purposes | 18 | 18 |
| Other | 6,005 | 2,516 |
| Total prepaid expenses and other current assets | $ 40,190 | $ 27,383 |