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Long-term Debt (Details) $ in Thousands | 6 Months Ended |  |  |
--- | --- | --- | --- | ---
Jul. 07, 2017 USD ($) | Jun. 30, 2017 USD ($) | Jun. 27, 2017 USD ($) | Jun. 30, 2016 USD ($) | Aug. 30, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Long-term debt [Line Items] |  |  |  |  |  |  |
Cash and cash equivalents |  | $ 226,882 |  | $ 140,555 |  | $ 181,758 | $ 208,056
Weighted average interest rate |  | 4.58% |  | 4.00% |  |  |
Loan reference interest rate |  | LIBOR |  |  |  |  |
Write off of unamortized deferred financing fees |  | $ 358 |  | $ 1,801 |  |  |
ABN Amro Bank $30,844 Facility |  |  |  |  |  |  |
Long-term debt [Line Items] |  |  |  |  |  |  |
Issuance date |  | Jun. 23, 2017 |  |  |  |  |
Face amount |  | $ 30,844 |  |  |  |  |
Number of loan tranches |  | 2 |  |  |  |  |
ABN Amro Bank $30,844 Facility | Tranche A |  |  |  |  |  |  |
Long-term debt [Line Items] |  |  |  |  |  |  |
Face amount |  | $ 16,000 |  |  |  |  |
Proceeds from issuance of debt |  |  | $ 16,000 |  |  |  |
Number of vessels financed |  | 2 |  |  |  |  |
Vessels provided as security |  | Tranche A is secured by Star Charis and Star Suzanna |  |  |  |  |
Maturity date |  | Jun. 30, 2022 |  |  |  |  |
Number of installments |  | 20 |  |  |  |  |
Frequency of payments |  | quarterly |  |  |  |  |
Date of first required payment |  | Sep. 30, 2017 |  |  |  |  |
Balloon installment |  | $ 6,240 |  |  |  |  |
ABN Amro Bank $30,844 Facility | Tranche A - First 4 installments |  |  |  |  |  |  |
Long-term debt [Line Items] |  |  |  |  |  |  |
Number of installments |  | 4 |  |  |  |  |
Repayment installment |  | $ 1,000 |  |  |  |  |
ABN Amro Bank $30,844 Facility | Tranche A - Last 16 installments |  |  |  |  |  |  |
Long-term debt [Line Items] |  |  |  |  |  |  |
Number of installments |  | 16 |  |  |  |  |
Repayment installment |  | $ 360 |  |  |  |  |
ABN Amro Bank $30,844 Facility | Tranche B |  |  |  |  |  |  |
Long-term debt [Line Items] |  |  |  |  |  |  |
Face amount |  | $ 14,844 |  |  |  |  |
Proceeds from issuance of debt | $ 14,844 |  |  |  |  |  |
Vessels provided as security |  | Tranche B is secured by Star Angelina and Star Gwyneth |  |  |  |  |
Maturity date |  | Jun. 30, 2022 |  |  |  |  |
Number of installments |  | 17 |  |  |  |  |
Frequency of payments |  | quarterly |  |  |  |  |
Repayment installment |  | $ 640 |  |  |  |  |
Date of first required payment |  | Jul. 30, 2018 |  |  |  |  |
Balloon installment |  | $ 3,964 |  |  |  |  |
Restructuring Letter Agreements |  |  |  |  |  |  |
Long-term debt [Line Items] |  |  |  |  |  |  |
Prepayment amount |  |  |  |  | $ 3,635 |  |
Percentage of the equity used for the acquisition of vessels |  |  |  |  | 20.00% |  |
Star Charis |  |  |  |  |  |  |
Long-term debt [Line Items] |  |  |  |  |  |  |
DWT |  | 81,711 |  |  |  |  |
Delivery date |  | March 22, 2017 |  |  |  |  |
Star Suzanna |  |  |  |  |  |  |
Long-term debt [Line Items] |  |  |  |  |  |  |
DWT |  | 81,711 |  |  |  |  |
Delivery date |  | May 15, 2017 |  |  |  |  |
Diva |  |  |  |  |  |  |
Long-term debt [Line Items] |  |  |  |  |  |  |
DWT |  | 56,582 |  |  |  |  |
Delivery date |  | July 24, 2017 |  |  |  |  |
Two newbuilding contracts |  |  |  |  |  |  |
Long-term debt [Line Items] |  |  |  |  |  |  |
Number of newbuilding contracts terminated |  |  |  | 2 |  |  |
Not legally restricted |  |  |  |  |  |  |
Long-term debt [Line Items] |  |  |  |  |  |  |
Cash and cash equivalents |  | $ 52,162 |  |  |  | 47,566 |
Legally restricted |  |  |  |  |  |  |
Long-term debt [Line Items] |  |  |  |  |  |  |
Restricted cash |  | $ 20,540 |  |  |  | 14,004 |
2019 Notes |  |  |  |  |  |  |
Long-term debt [Line Items] |  |  |  |  |  |  |
Maturity date |  | Nov. 30, 2019 |  |  |  |  |
Unamortized deferred finance fees |  | $ 1,028 |  |  |  | $ 1,243 |
First-priority mortgage |  |  |  |  |  |  |
Long-term debt [Line Items] |  |  |  |  |  |  |
Number of vessels |  | 62 |  |  |  |  |
Amount of vessels pledged as collateral |  | $ 1,465,411 |  |  |  |  |
Cross collateral, Bareboat vessels |  |  |  |  |  |  |
Long-term debt [Line Items] |  |  |  |  |  |  |
Capital leased assets, Number of vessels |  | 8 |  |  |  |  |
Capital leased assets, Net book value |  | $ 331,248 |  |  |  |  |

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