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Long-term debt - Pre-Existing Loan Facilities 2 (Details) $ in Thousands | 1 Months Ended | 10 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jan. 31, 2019 USD ($) | Oct. 31, 2014 USD ($) | Dec. 31, 2019 USD ($) | Dec. 20, 2018 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
ABN $115,000 Facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Initiation date |  |  | Dec. 17, 2018 |  |  |
Maximum borrowing capacity |  |  | $ 115,000 |  |  |
Vessels provided as collateral |  |  | The ABN $115,000 Facility is secured by a first priority on the four Augustea Vessels and the Step 1 Vessels. |  |  |
Number of loan tranches |  |  | 4 |  |  |
Number of vessels financed |  |  | 7 |  |  |
ABN $115,000 Facility | Tranche A |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Maximum borrowing capacity |  |  | $ 69,525 |  |  |
Amount drawn down |  |  |  | $ 69,525 |  |
Number of installments |  |  | 20 |  |  |
Frequency of payments |  |  | quarterly |  |  |
Repayment installment |  |  | $ 1,705 |  |  |
Balloon installment |  |  | $ 35,428 |  |  |
Line of credit facility, description |  |  | The first tranche was used to refinance the then existing indebtedness of four of the Augustea Vessels Star Virginia, Star Scarlett, Star Jeanette and Star Audrey. |  |  |
Number of vessels financed |  |  | 4 |  |  |
ABN $115,000 Facility | Tranche B |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Maximum borrowing capacity |  |  | $ 7,900 |  |  |
Amount drawn down |  |  |  | $ 7,900 |  |
Number of installments |  |  | 20 |  |  |
Frequency of payments |  |  | quarterly |  |  |
Repayment installment |  |  | $ 282 |  |  |
Balloon installment |  |  | $ 2,260 |  |  |
Line of credit facility, description |  |  | The second tranche was used to partially finance the acquisition cost of the Star Bright. |  |  |
ABN $115,000 Facility | Remaining Two Tranches |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Line of credit facility, description |  |  | The remaining two tranches were used to partially finance the acquisition cost of the Star Marianne and Star Janni. |  |  |
ABN $115,000 Facility | Tranche C |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Maximum borrowing capacity |  |  | $ 17,875 |  |  |
Amount drawn down | $ 17,875 |  |  |  |  |
Number of installments |  |  | 19 |  |  |
Frequency of payments |  |  | quarterly |  |  |
Repayment installment |  |  | $ 672 |  |  |
Balloon installment |  |  | 5,114 |  |  |
ABN $115,000 Facility | Tranche D |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Maximum borrowing capacity |  |  | $ 17,875 |  |  |
Amount drawn down | $ 17,875 |  |  |  |  |
Number of installments |  |  | 19 |  |  |
Frequency of payments |  |  | quarterly |  |  |
Repayment installment |  |  | $ 672 |  |  |
Balloon installment |  |  | $ 5,114 |  |  |
DVB $24,750 Facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Initiation date |  |  | Oct. 30, 2014 |  |  |
Amount drawn down |  | $ 24,750 |  |  |  |
Number of installments |  |  | 24 |  |  |
Frequency of payments |  |  | quarterly |  |  |
Balloon installment |  |  | $ 12,150 |  |  |
Expiration date |  |  | Oct. 31, 2020 |  |  |
Vessels provided as collateral |  |  | The DVB $24,750 Facility is secured by a first priority pledge of the membership interests of the Christine Shipco LLC. |  |  |
Line of credit facility, description |  |  | The DVB $24,750 Facility was used to partially finance the acquisition of 100% of the equity interests of Christine Shipco LLC, which is the owner of the vessel Star Martha. |  |  |
DVB $24,750 Facility | Christine Shipco LLC |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Percentage of equity interest acquired |  | 100.00% |  |  |  |
DVB $24,750 Facility | First Four Installments |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Repayment installment |  |  | $ 900 |  |  |
DVB $24,750 Facility | Last Twenty Installments |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Repayment installment |  |  | $ 450 |  |  |
Sinosure Facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Initiation date |  |  | Feb. 11, 2015 |  |  |
Maximum borrowing capacity |  |  | $ 98,165 |  |  |
Repayment period |  |  | 12 years |  |  |
Number of installments |  |  | 48 |  |  |
Frequency of payments |  |  | quarterly |  |  |
Vessels provided as collateral |  |  | The Sinosure Facility is secured by a first priority cross collateralized mortgage over the Sinosure Financed Vessels. |  |  |
Line of credit facility, description |  |  | The Sinosure Facility was used to partially finance the construction cost of the newbuilding vessels, Honey Badger, Wolverine, Star Antares, Star Lutas, Kennadi and Mackenzie (the “Sinosure Financed Vessels”). |  |  |
Number of loan tranches |  |  | 6 |  |  |
Honey Badger |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Delivery Date |  |  | February 27, 2015 |  |  |
Wolverine |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Delivery Date |  |  | February 27, 2015 |  |  |
Star Antares |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Delivery Date |  |  | October 9, 2015 |  |  |
Star Lutas |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Delivery Date |  |  | January 6, 2016 |  |  |
Kennadi |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Delivery Date |  |  | January 8, 2016 |  |  |
Mackenzie |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Delivery Date |  |  | March 2, 2016 |  |  |
8.30% 2022 Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Issuance date |  |  | Nov. 09, 2017 |  |  |
Face amount |  |  | $ 50,000 |  |  |
Maturity date |  |  | Nov. 15, 2022 |  |  |
Interest rate |  |  | 8.30% |  |  |
Frequency of payments |  |  | quarterly in arrears on the 15th day of February, May, August and November |  |  |
Date of first required payment |  |  | Feb. 15, 2018 |  |  |
Redemption price percentage |  |  | 100.00% |  |  |
Redemption description |  |  | The Company may redeem the 2022 Notes in whole, but not in part, at any time at its option, at a redemption price equal to 100% of the principal amount to be redeemed, plus accrued and unpaid interest. |  |  |
Unamortized debt issuance costs |  |  | $ 1,179 |  | $ 1,590 |
8.00% 2019 Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate |  |  | 8.00% |  |  |
Repurchased face amount |  |  |  |  |  | $ 50,000

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