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v3.19.1

Subsequent Events (Details) $ in Thousands |  |  | 1 Months Ended | 2 Months Ended | 8 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Jan. 14, 2019 USD ($) shares | Jan. 07, 2019 USD ($) shares | Jan. 31, 2019 USD ($) | Jan. 30, 2019 USD ($) | Jan. 28, 2019 USD ($) | Mar. 01, 2019 USD ($) | Feb. 28, 2019 USD ($) shares | Aug. 27, 2018 USD ($) shares | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cash portion of the consideration |  |  |  |  |  |  |  |  | $ 328,634 | $ 143,684 | $ 396,154
Subsequent Event | Restricted Share Units (RSUs) |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Shares authorized | shares |  | 4,000,000 |  |  |  |  |  |  |  |  |
Vesting rights |  | Each RSU represents, upon vesting, a right for the relevant beneficiary to receive one (1) SBLK share. |  |  |  |  |  |  |  |  |
Subsequent Event | Restricted Share Units (RSUs) | Minimum |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Fleet performance indices |  | $ 120,000 |  |  |  |  |  |  |  |  |
Subsequent Event | Restricted Share Units (RSUs) | Maximum |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Fleet performance indices |  | $ 300,000 |  |  |  |  |  |  |  |  |
Subsequent Event | Restricted Share Units (RSUs) | Tranche One |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Vesting date |  | Apr. 30, 2021 |  |  |  |  |  |  |  |  |
Shares expected to vest | shares |  | 2,000,000 |  |  |  |  |  |  |  |  |
Subsequent Event | Restricted Share Units (RSUs) | Tranche Two |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Vesting date |  | Apr. 30, 2022 |  |  |  |  |  |  |  |  |
Shares expected to vest | shares |  | 2,000,000 |  |  |  |  |  |  |  |  |
Subsequent Event | Share Repurchase Program |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of shares repurchased and retired | shares |  |  |  |  |  |  | 195,605 |  |  |  |
Subsequent Event | SEB facility |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Initiation date |  |  |  |  | Jan. 28, 2019 |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  | $ 71,400 |  |  |  |  |  |
Number of loan tranches |  |  |  |  | 4 |  |  |  |  |  |
Vessels provided as collateral |  |  |  |  | The SEB Facility is secured by a first priority mortgage on the vessels Star Laetitia and Star Sienna. |  |  |  |  |  |
Maturity date |  |  |  |  | Jan. 31, 2025 |  |  |  |  |  |
Subsequent Event | SEB facility | Tranche A |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amount drawn down |  |  |  | $ 32,800 |  |  |  |  |  |  |
Subsequent Event | SEB facility | Tranche B |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amount drawn down |  |  |  | $ 32,800 |  |  |  |  |  |  |
Subsequent Event | SEB facility | First Two Tranches |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, description |  |  |  | The first two tranches were used together with cash on hand to pay all the outstanding amounts under the lease agreements of the Star Laetitia and the Star Sienna, which are two of Augustea vessels. |  |  |  |  |  |  |
Subsequent Event | SEB facility | Tranche C |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  | $ 1,190 |  |  |  |  |  |
Subsequent Event | SEB facility | Tranche D |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  | $ 1,190 |  |  |  |  |  |
Subsequent Event | SEB facility | Remaining Two Tranches |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of installments |  |  |  |  | 12 |  |  |  |  |  |
Frequency of payments |  |  |  |  | quarterly |  |  |  |  |  |
Line of credit facility, description |  |  |  |  | The remaining two tranches will be used to finance the acquisition and installation of scrubber equipment for the vessels Star Laetitia and Star Sienna. |  |  |  |  |  |
Subsequent Event | E.SUN facility |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Initiation date |  |  | Jan. 31, 2019 |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  | $ 37,100 |  |  |  |  |  |  |  |
Amount drawn down |  |  |  |  |  | $ 37,100 |  |  |  |  |
Vessels provided as collateral |  |  | The E.SUN Facility is secured by a first priority mortgage on the vessel Star Ariadne. |  |  |  |  |  |  |  |
Line of credit facility, description |  |  | The E.SUN Facility will be used to pay all outstanding amounts under the lease agreement of the vessel Star Ariadne. |  |  |  |  |  |  |  |
Maturity date |  |  | Feb. 29, 2024 |  |  |  |  |  |  |  |
Subsequent Event | ING $52,800 Facility |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  | $ 52,800 |  |  |  |
Number of loan tranches |  |  |  |  |  |  | 4 |  |  |  |
Vessels provided as collateral |  |  |  |  |  |  | The ING $52,800 Facility is secured by a first priority mortgage on the vessels ABY Asia and Star Magnanimus. |  |  |  |
Subsequent Event | ING $52,800 Facility | Tranche A |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  | $ 17,400 |  |  |  |
Subsequent Event | ING $52,800 Facility | Tranche B |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  | $ 32,600 |  |  |  |
Subsequent Event | ING $52,800 Facility | First Two Tranches |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, description |  |  |  |  |  |  | The first two tranches will be used to refinance all outstanding amounts under the lease agreements of the vessels ABY Asia and Star Magnanimus. |  |  |  |
Expiration period |  |  |  |  |  |  | 7 years |  |  |  |
Subsequent Event | ING $52,800 Facility | Tranche C |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  | $ 1,400 |  |  |  |
Subsequent Event | ING $52,800 Facility | Tranche D |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  | $ 1,400 |  |  |  |
Subsequent Event | ING $52,800 Facility | Remaining Two Tranches |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, description |  |  |  |  |  |  | The remaining two tranches will be used to finance the acquisition and installation of scrubber equipment for the vessels ABY Asia and Star Magnanimus. |  |  |  |
Expiration period |  |  |  |  |  |  | 4 years |  |  |  |
Subsequent Event | Atradius Facility |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  | $ 36,600 |  |  |  |
Number of installments |  |  |  |  |  |  | 10 |  |  |  |
Frequency of payments |  |  |  |  |  |  | half yearly |  |  |  |
Repayment installment |  |  |  |  |  |  | $ 3,600 |  |  |  |
Vessels provided as collateral |  |  |  |  |  |  | The Atradius Facility is secured by second mortgage on certain of the 42 vessels. |  |  |  |
Line of credit facility, description |  |  |  |  |  |  | The Atradius Facility will be used to finance the acquisition of scrubber equipment for 42 vessels. |  |  |  |
Star Marianne | Subsequent Event |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Delivery Date |  | January 7, 2019 |  |  |  |  |  |  |  |  |
Star Janni | Subsequent Event |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Delivery Date | January 14, 2019 |  |  |  |  |  |  |  |  |  |
Step 1 Vessels |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of shares issued as part of the consideration | shares |  |  |  |  |  |  |  | 1,340,000 |  |  |
Cash portion of the consideration |  |  |  |  |  |  |  | $ 41,700 |  |  |
Step 1 Vessels | Star Marianne and Star Janni | Subsequent Event |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of shares issued as part of the consideration | shares | 999,336 |  |  |  |  |  |  |  |  |  |
Cash portion of the consideration | $ 32,500 |  |  |  |  |  |  |  |  |  |

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