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Transactions with Related Parties (Narrative) (Details) - USD ($) | 6 Months Ended |
--- | --- | ---
Jun. 30, 2026 | Jun. 30, 2025 | Dec. 31, 2025
Related Party Transaction [Line Items] |  |  |
Accounts payable | $ 11,754,000 |  | $ 10,611,000
Altair Travel Agency S.A. [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Related Party Transaction, Amounts of Transaction | 1,458,000 | $ 1,426,000 |
Accounts payable | 241,000 |  | 89,000
Steamship Shipbroking Enterprises [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Related Party Transaction, Amounts of Transaction | 2,150,000 | $ 2,136,000 |
Accounts payable | 0 |  | $ 0
Steamship Shipbroking Enterprises [Member] | FuelEUAssignmentAgreement [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Related Party Transaction, Amounts of Transaction | $ 335,000 |  |

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