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Advances for Vessels Under Construction and Vessels, net (Schedule of Vessels, net in the Accompanying Consolidated Balance Sheets) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Vessel Cost |  |
Beginning balance | $ 1,114,247 | $ 1,141,128
Additions for vessel acquisitions and improvements | 958 | 61,682
Vessel disposals | (46,001) | (60,655)
Vessel disposal due to deconsolidation of subsidiary |  | (27,908)
Ending balance | 1,069,204 | 1,114,247
Accumulated Depreciation |  |
Beginning balance | (214,055) | (191,512)
Vessel disposals | 16,849 | 21,688
Depreciation for the period | (38,586) | (44,231)
Ending balance | (235,792) | (214,055)
Net Book Value |  |
Beginning balance | 900,192 | 949,616
Additions for vessel acquisitions and improvements | 958 | 61,682
Vessel disposal | (29,152) | (38,967)
Vessel disposal due to deconsolidation of subsidiary |  | (27,908)
Depreciation for the period | (38,586) | (44,231)
Ending balance | $ 833,412 | $ 900,192

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