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Long-term Debt - Additional Information (Details) - USD ($) $ in Thousands | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Jan. 08, 2019 | Jul. 31, 2018 | May 31, 2018 | Feb. 28, 2018 | Sep. 30, 2016
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Loan reference interest rate | LIBOR |  |  |  |  |  |  |
Write off of unamortized issuance costs | $ 2,383 | $ 1,257 | $ 2,375 |  |  |  |  |
Cash and cash equivalents | 204,921 | 257,911 | 181,758 |  |  |  |  |
Restricted cash | $ 6,435 | $ 7,169 | $ 5,121 |  |  |  |  |
Weighted average interest rate | 5.59% | 4.72% | 4.13% |  |  |  |  |
Unused credit facilities, commitment fee | $ 1,049 | $ 6 | $ 472 |  |  |  |  |
Not legally restricted |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Cash and cash equivalents | 53,500 | 51,359 |  |  |  |  |  |
Legally restricted |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Restricted cash | $ 8,956 | 15,589 |  |  |  |  |  |
Restructuring Letter Agreements |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Prepayment amount |  | $ 9,768 |  |  | $ 22,723 | $ 30,000 | $ 35,632 |
Amount of equity to be raised under debt instrument covenants |  |  |  |  |  |  |  | $ 50,000
NBG $30,000 Facility | Star Delta | Subsequent Event |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Prepayment amount |  |  |  | $ 3,537 |  |  |  |

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