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Vessels and other fixed assets, net (Details) $ in Thousands |  |  | 2 Months Ended | 3 Months Ended | 4 Months Ended | 6 Months Ended | 7 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 08, 2016 USD ($) | Jan. 06, 2016 USD ($) | Mar. 02, 2016 USD ($) | Feb. 26, 2016 USD ($) | Mar. 22, 2017 USD ($) | May 15, 2017 USD ($) | Jun. 30, 2017 USD ($) | Jun. 27, 2017 USD ($) | Jun. 30, 2016 USD ($) | Jul. 24, 2017 USD ($) | Dec. 31, 2015
Vessels [Line Items] |  |  |  |  |  |  |  |  |  |  |
Payments to acquire property plant and equipment |  |  |  |  |  |  | $ 116,679 |  | $ 388,660 |  |
Gain / (Loss) on sale of vessel |  |  |  |  |  |  | (370) |  | (21) |  |
Impairment loss |  |  |  |  |  |  | $ 0 |  | 6,694 |  |
ABN Amro Bank $30,844 Facility |  |  |  |  |  |  |  |  |  |  |
Vessels [Line Items] |  |  |  |  |  |  |  |  |  |  |
Issuance date |  |  |  |  |  |  | Jun. 23, 2017 |  |  |  |
Face amount |  |  |  |  |  |  | $ 30,844 |  |  |  |
Star Lutas |  |  |  |  |  |  |  |  |  |  |
Vessels [Line Items] |  |  |  |  |  |  |  |  |  |  |
Delivery date |  |  |  |  |  |  | January 6, 2016 |  |  |  |
Payments to acquire property plant and equipment |  | $ 19,770 |  |  |  |  |  |  |  |  |
Star Lutas | Sinosure Facility |  |  |  |  |  |  |  |  |  |  |
Vessels [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amount drawn down |  | $ 14,813 |  |  |  |  |  |  |  |  |
Kennadi |  |  |  |  |  |  |  |  |  |  |
Vessels [Line Items] |  |  |  |  |  |  |  |  |  |  |
Delivery date |  |  |  |  |  |  | January 8, 2016 |  |  |  |
Payments to acquire property plant and equipment | $ 21,229 |  |  |  |  |  |  |  |  |  |
Kennadi | Sinosure Facility |  |  |  |  |  |  |  |  |  |  |
Vessels [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amount drawn down | $ 14,478 |  |  |  |  |  |  |  |  |  |
Star Poseidon |  |  |  |  |  |  |  |  |  |  |
Vessels [Line Items] |  |  |  |  |  |  |  |  |  |  |
Delivery date |  |  |  |  |  |  | February 26, 2016 |  |  |  |
Payments to acquire property plant and equipment |  |  |  | $ 33,390 |  |  |  |  |  |  |
Star Poseidon | DNB-SEB-CEXIM $227,500 Facility |  |  |  |  |  |  |  |  |  |  |
Vessels [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amount drawn down |  |  |  | $ 23,400 |  |  |  |  |  |  |
Mackenzie |  |  |  |  |  |  |  |  |  |  |
Vessels [Line Items] |  |  |  |  |  |  |  |  |  |  |
Delivery date |  |  |  |  |  |  | March 2, 2016 |  |  |  |
Payments to acquire property plant and equipment |  |  | $ 18,221 |  |  |  |  |  |  |  |
Mackenzie | Sinosure Facility |  |  |  |  |  |  |  |  |  |  |
Vessels [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amount drawn down |  |  | $ 12,720 |  |  |  |  |  |  |  |
Star Marisa |  |  |  |  |  |  |  |  |  |  |
Vessels [Line Items] |  |  |  |  |  |  |  |  |  |  |
Delivery date |  |  |  |  |  |  | March 11, 2016 |  |  |  |
Star Libra |  |  |  |  |  |  |  |  |  |  |
Vessels [Line Items] |  |  |  |  |  |  |  |  |  |  |
Delivery date |  |  |  |  |  |  | June 6, 2016 |  |  |  |
Operating vessels |  |  |  |  |  |  |  |  |  |  |
Vessels [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of vessels sold |  |  |  |  |  |  |  |  |  |  | 4
Newbuilding vessels |  |  |  |  |  |  |  |  |  |  |
Vessels [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of vessels sold |  |  |  |  |  |  |  |  |  |  | 5
Star Michele |  |  |  |  |  |  |  |  |  |  |
Vessels [Line Items] |  |  |  |  |  |  |  |  |  |  |
Impairment loss |  |  |  |  |  |  |  |  | $ 5,626 |  |
Star Virgo |  |  |  |  |  |  |  |  |  |  |
Vessels [Line Items] |  |  |  |  |  |  |  |  |  |  |
Delivery date |  |  |  |  |  |  | March 1, 2017 |  |  |  |
Star Ariadne |  |  |  |  |  |  |  |  |  |  |
Vessels [Line Items] |  |  |  |  |  |  |  |  |  |  |
Delivery date |  |  |  |  |  |  | March 28, 2017 |  |  |  |
Kamsarmax vessels |  |  |  |  |  |  |  |  |  |  |
Vessels [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of vessels acquired |  |  |  |  |  |  | 2 |  |  |  |
Star Charis |  |  |  |  |  |  |  |  |  |  |
Vessels [Line Items] |  |  |  |  |  |  |  |  |  |  |
Delivery date |  |  |  |  |  |  | March 22, 2017 |  |  |  |
DWT |  |  |  |  |  |  | 81,711 |  |  |  |
Payments to acquire property plant and equipment |  |  |  |  | $ 15,150 |  |  |  |  |  |
Star Suzanna |  |  |  |  |  |  |  |  |  |  |
Vessels [Line Items] |  |  |  |  |  |  |  |  |  |  |
Delivery date |  |  |  |  |  |  | May 15, 2017 |  |  |  |
DWT |  |  |  |  |  |  | 81,711 |  |  |  |
Payments to acquire property plant and equipment |  |  |  |  |  | $ 15,150 |  |  |  |  |
Diva |  |  |  |  |  |  |  |  |  |  |
Vessels [Line Items] |  |  |  |  |  |  |  |  |  |  |
Delivery date |  |  |  |  |  |  | July 24, 2017 |  |  |  |
DWT |  |  |  |  |  |  | 56,582 |  |  |  |
Payments to acquire property plant and equipment |  |  |  |  |  |  |  |  |  | $ 10,500 |
Tranche A | ABN Amro Bank $30,844 Facility |  |  |  |  |  |  |  |  |  |  |
Vessels [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of debt |  |  |  |  |  |  |  | $ 16,000 |  |  |
Face amount |  |  |  |  |  |  | $ 16,000 |  |  |  |
Number of vessels financed |  |  |  |  |  |  | 2 |  |  |  |
Capital Lease Obligations |  |  |  |  |  |  |  |  |  |  |
Vessels [Line Items] |  |  |  |  |  |  |  |  |  |  |
Capital leased assets, Number of vessels |  |  |  |  |  |  | 8 |  | 6 |  |
Interest and finance costs |  |  |  |  |  |  | $ 5,805 |  | $ 3,016 |  |
Capital leased assets, Net book value |  |  |  |  |  |  | 331,248 |  |  |  |
Capital leased assets, Accumulated depreciation |  |  |  |  |  |  | $ 15,298 |  |  |  |

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