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Finance Liabilities (Narrative) (Details)
$ in Thousands
6 Months Ended
Jun. 30, 2025
USD ($)
Jun. 30, 2024
USD ($)
Dec. 31, 2024
USD ($)
Dec. 06, 2022
Aug. 17, 2022
Vessels
Mar. 29, 2022
Property, Plant and Equipment [Line Items]            
Finance liabilities, current $ 9,820   $ 9,608      
Finance liabilities, excluding current maturities $ 108,373   $ 113,300      
Weighted average remaining lease term 6 years 2 months 15 days          
Average interest rate 4.83%          
Sublease Income $ 14,603 $ 14,678        
Florida 2022 Built Capsize Vessel [Member]            
Property, Plant and Equipment [Line Items]            
Term for bareboat charter party           10 years
New Orleans And Santa Barbara Vessels [Member]            
Property, Plant and Equipment [Line Items]            
Term for bareboat charter party         8 years  
Number of sale and leaseback agreements | Vessels         2  
DSI Andromeda [Member]            
Property, Plant and Equipment [Line Items]            
Term for bareboat charter party       10 years