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Long-term Debt (Details) $ in Thousands | 2 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Feb. 28, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Aug. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) | Dec. 31, 2014 USD ($)
Long-term debt [Line Items] |  |  |  |  |  |  |
Cash and cash equivalents |  | $ 257,911 | $ 181,758 | $ 208,056 |  |  | $ 86,000
Restricted cash |  | $ 7,169 | $ 5,121 |  |  |  |
Weighted average interest rate |  | 4.72% | 4.13% | 3.69% |  |  |
Unused credit facilities, commitment fee |  | $ 6 | $ 472 | $ 3,157 |  |  |
Number of vessels |  | 71 |  |  |  |  |
Loan reference interest rate |  | LIBOR |  |  |  |  |
Write off of unamortized deferred financing fees |  | $ 1,257 | 2,375 | $ 974 |  |  |
Subsequent Event |  |  |  |  |  |  |
Long-term debt [Line Items] |  |  |  |  |  |  |
Excess Cash | $ 35,632 |  |  |  |  |  |
Not legally restricted |  |  |  |  |  |  |
Long-term debt [Line Items] |  |  |  |  |  |  |
Cash and cash equivalents |  | 51,359 | 47,566 |  |  |  |
Legally restricted |  |  |  |  |  |  |
Long-term debt [Line Items] |  |  |  |  |  |  |
Restricted cash |  | 15,589 | $ 14,004 |  |  |  |
8.30% 2022 Notes |  |  |  |  |  |  |
Long-term debt [Line Items] |  |  |  |  |  |  |
Unamortized debt issuance costs |  | $ 2,000 |  |  |  |  |
First-priority mortgage |  |  |  |  |  |  |
Long-term debt [Line Items] |  |  |  |  |  |  |
Number of vessels |  | 63 |  |  |  |  |
Amount of vessels pledged as collateral |  | $ 1,449,547 |  |  |  |  |
Cross collateral, Bareboat vessels |  |  |  |  |  |  |
Long-term debt [Line Items] |  |  |  |  |  |  |
Capital leased assets, Number of vessels |  | 8 |  |  |  |  |
Capital leased assets, Net book value |  | $ 325,301 |  |  |  |  |
Restructuring letter agreements |  |  |  |  |  |  |
Long-term debt [Line Items] |  |  |  |  |  |  |
Amount of equity to be raised under debt instrument covenants |  |  |  |  |  | $ 50,000 |
Prepayment amount |  |  |  |  | $ 3,635 |  |
Percentage of the equity used for acquisition of vessels |  |  |  |  | 20.00% |  |
Excess Cash |  | $ 6,133 |  |  |  |  |
Restructuring letter agreements | Subsequent Event |  |  |  |  |  |  |
Long-term debt [Line Items] |  |  |  |  |  |  |
Excess Cash | $ 35,632 |  |  |  |  |  |

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