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Vessels and Other Fixed Assets, Net - 2019 (Details) $ / shares in Units, $ in Thousands |  | 5 Months Ended | 11 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Jan. 14, 2019 USD ($) $ / shares shares | May 27, 2019 USD ($) shares | Nov. 16, 2018 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Jan. 07, 2019 $ / shares | Aug. 27, 2018
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Cash portion of the consideration |  |  |  | $ 347,140 | $ 328,634 | $ 143,684 |  |
Capital leased assets, net amount |  |  |  | $ 798,863 | 992,777 |  |  |
Number of vessels owned |  |  |  | 116 |  |  |  |
Loss / (gain) on sale of vessels |  |  |  | $ 5,493 | 0 | (2,598) |  |
Total acquisition cost |  |  |  | 96,671 | 129,749 |  |  |
Impairment loss |  |  |  | $ 3,411 | $ 17,784 | $ 0 |  |
First-priority mortgage |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Number of vessels owned |  |  |  | 80 |  |  |  |
Amount of vessels pledged as collateral |  |  |  | $ 2,166,419 |  |  |  |
Cross collateral, Bareboat vessels |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Capital leased assets, net amount |  |  |  | $ 798,863 |  |  |  |
ABN $115,000 Facility |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Number of vessels financed |  |  |  | 7 |  |  |  |
BNP Facility |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Number of vessels financed |  |  |  | 2 |  |  |  |
Citi $130,000 Facility |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Number of vessels financed |  |  |  | 11 |  |  |  |
HSBC $80,000 Facility |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Number of vessels financed |  |  |  | 8 |  |  |  |
Step 1 Vessels |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Number of operating vessels acquired |  |  |  |  |  |  |  | 3
Katie K |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Delivery date |  |  |  | April 16, 2019 |  |  |  |
Debbie H |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Delivery date |  |  |  | May 28, 2019 |  |  |  |
Star Ayesha |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Delivery date |  |  |  | July 15, 2019 |  |  |  |
Star Janni |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Delivery date |  |  |  | January 7, 2019 |  |  |  |
Star Marianne |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Delivery date |  |  |  | January 14, 2019 |  |  |  |
Star Marianne and Star Janni | Step 1 Vessels |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Number of shares issued as part of the consideration | shares | 999,336 |  |  |  |  |  |  |
Cash portion of the consideration | $ 31,772 |  |  |  |  |  |  |
Total acquisition cost | $ 41,837 |  |  |  |  |  |  |
Star Janni | Step 1 Vessels |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Shares Issued, Price Per Share | $ / shares |  |  |  |  |  |  | $ 10.41 |
Star Marianne | Step 1 Vessels |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Shares Issued, Price Per Share | $ / shares | $ 9.66 |  |  |  |  |  |  |
Delphin Vessels |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Number of operating vessels acquired |  | 11 |  |  |  |  |  |
Number of shares issued as part of the consideration | shares |  | 4,503,370 |  |  |  |  |  |
Cash portion of the consideration |  | $ 80,000 |  |  |  |  |  |
Total acquisition cost |  | 127,532 |  |  |  |  |  |
Delphin Vessels | CMBL |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Description of Capital leases, Term of contract |  |  |  | Bareboat charter for seven years |  |  |  |
Sale leaseback transaction, Remaining borrowing capacity |  | $ 91,431 |  |  |  |  |  |
Star Kappa |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Disposal date |  |  |  | Mar. 08, 2019 |  |  |  |
Star Aurora |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Disposal date |  |  |  | Mar. 06, 2019 |  |  |  |
Star Anna |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Delivery date |  |  |  | November 16, 2018 |  |  |  |
Total acquisition cost |  |  | $ 19,800 |  |  |  |  |
Disposal date |  |  |  | Sep. 23, 2019 |  |  |  |
Star Gamma |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Disposal date |  |  |  | Sep. 05, 2019 |  |  |  |
Star Cosmo |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Disposal date |  |  |  | Dec. 17, 2019 |  |  |  |
Star Epsilon |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Disposal date |  |  |  | Dec. 09, 2019 |  |  |  |
Star Delta |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Loss / (gain) on sale of vessels |  |  |  | $ 5,493 |  |  |  |
Star Gamma and Star Anna |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Impairment loss |  |  |  | $ 3,411 |  |  |  |

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