Interest Expense and Finance Cost (Table) (Details) - USD ($) $ in Thousands |
3 Months Ended | 9 Months Ended | 12 Months Ended | ||||
|---|---|---|---|---|---|---|---|
Sep. 30, 2018 |
Sep. 30, 2017 |
Sep. 30, 2018 |
Sep. 30, 2017 |
Dec. 31, 2017 |
Dec. 31, 2016 |
Dec. 31, 2015 |
|
| INTEREST EXPENSE AND FINANCE COST [Abstract] | |||||||
| Interest expense | $ 115,099 | $ 107,787 | $ 108,488 | ||||
| Amortization and write-off of deferred financing costs | 6,391 | 5,653 | 4,524 | ||||
| Other | 121 | 199 | 139 | ||||
| Interest expense and finance cost | $ 32,734 | $ 28,825 | $ 97,797 | $ 83,812 | $ 121,611 | $ 113,639 | $ 113,151 |