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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Amount after accumulated depreciation, depletion and amortization, of divestiture of long-lived, physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Amount of decrease in accumulated depreciation, depletion and amortization as a result of sale or disposal of property, plant and equipment.

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Amount of acquisition of long-lived, physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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