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Overview - Management and organizational structure (Details) $ in Thousands |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Jun. 17, 2017 USD ($) | Jun. 30, 2021 USD ($) | Jun. 30, 2022 USD ($) item subsidiary segment | Jun. 30, 2021 USD ($) | Dec. 31, 2021 USD ($)
Overview |  |  |  |  |
Number of operating segments | segment |  |  | 1 |  |
Numbered of owned vessels in operation | item |  |  | 24 |  |
Number of chartered vessels in operations | item |  |  | 3 |  |
Average Age Of Vessels |  |  | 8 years 7 months 6 days |  |
Number of wholly owned subsidiaries | subsidiary |  |  | 79 |  |
Common stock | $ |  |  | $ 391 |  | $ 364
Payments for equity investments | $ |  |  | $ 238 | $ 4,998 |
Anglo Ardmore Ship Management Limited |  |  |  |  |
Overview |  |  |  |  |
Number of joint ventures | item |  |  | 1 |  |
Percentage of ownership interest (as a percent) |  |  | 50.00% |  |
e1 Marine LLC |  |  |  |  |
Overview |  |  |  |  |
Number of joint ventures | item |  |  | 1 |  |
Percentage of ownership interest (as a percent) | 33.33% |  | 33.33% |  |
Element 1 Corp. |  |  |  |  |
Overview |  |  |  |  |
Percentage of ownership interest (as a percent) | 10.00% |  | 10.00% |  |
Common stock | $ | $ 5,300 | $ 5,300 |  | $ 5,300 |
Payments for equity investments | $ | $ 4,000 | $ 5,000 |  |  |

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