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Vessels and Other Fixed Assets, Net - 2018 (Details) $ / shares in Units, $ in Thousands | 6 Months Ended | 7 Months Ended | 9 Months Ended | 11 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Jul. 06, 2018 $ / shares shares | Aug. 03, 2018 $ / shares shares | Oct. 10, 2018 USD ($) $ / shares shares | Nov. 16, 2018 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Aug. 27, 2018
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Payments to acquire property plant and equipment |  |  |  |  |  | $ 347,140 | $ 328,634 | $ 143,684 |
Total acquisition cost |  |  |  |  |  | $ 96,671 | $ 129,749 |  |
Star Eleni |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Delivery date | [1] |  |  |  |  | January 3, 2018 |  |  |
Star Magnanimus |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Delivery date |  |  |  |  |  | March 26, 2018 |  |  |
Star Leo |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Delivery date | [1] |  |  |  |  | May 14, 2018 |  |  |
Songa Vessels |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Number of vessels acquired |  | 15 |  |  |  |  |  |  |
Number of shares issued as part of the final consideration | shares |  | 13,725,000 |  |  |  |  |  |  |
Total acquisition cost |  |  |  |  |  | $ 452,661 |  |  |
Shares Issued, Price Per Share | $ / shares |  | $ 13.31 |  |  |  |  |  |  |
Number of vessels financed |  |  |  |  |  | 10 |  |  |
Augustea Vessels |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Number of vessels acquired |  |  | 16 |  |  |  |  |  |
Number of shares issued as part of the final consideration | shares |  |  | 10,277,335 |  |  |  |  |  |
Total acquisition cost |  |  |  |  |  | $ 327,680 |  |  |
Shares Issued, Price Per Share | $ / shares |  |  | $ 14 |  |  |  |  |  |
Star Bright |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Delivery date |  |  |  |  |  | October 10, 2018 |  |  |
Star Anna |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Delivery date |  |  |  |  |  | November 16, 2018 |  |  |
Disposal date |  |  |  |  |  | Sep. 23, 2019 |  |  |
Total acquisition cost |  |  |  |  | $ 19,800 |  |  |  |
Star Delta |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Disposal date |  |  |  |  |  | Jan. 08, 2019 |  |  |
Step 1 Vessels |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Number of operating vessels acquired |  |  |  |  |  |  |  |  | 3
Step 1 Vessels | Star Bright |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Delivery date |  |  |  |  |  | Oct. 10, 2018 |  |  |
Number of shares issued as part of the final consideration | shares |  |  |  | 291,300 |  |  |  |  |
Payments to acquire property plant and equipment |  |  |  | $ 9,167 |  |  |  |  |
Total acquisition cost |  |  |  | $ 13,073 |  |  |  |  |
Shares Issued, Price Per Share | $ / shares |  |  |  | $ 13.87 |  |  |  |  |
[1] | Subject to a bareboat charter with purchase obligation at the expiration of the bareboat charter term (Note 7)

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