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Segment Data (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
USD ($)
Segment
Mar. 31, 2023
USD ($)
Dec. 31, 2023
USD ($)
Segment Reporting Information [Line Items]      
Number of reportable segments | Segment 2    
Revenues [Abstract]      
Revenues $ 808,022 $ 750,444  
Segment profit 91,641 54,672  
Total assets 5,775,837   $ 5,722,197
Other segment disclosures [Abstract]      
Gain on disposition of assets 74 2,230  
Interest expense (13,151) (13,221)  
Earnings before taxes on income 91,641 54,672  
Marine Transportation (KMT) [Member]      
Revenues [Abstract]      
Revenues 475,412 412,495  
Distribution and Services [Member]      
Revenues [Abstract]      
Revenues 332,610 337,949  
Other [Member]      
Revenues [Abstract]      
Segment profit (13,356) (11,156)  
Total assets 153,925   110,882
Other segment disclosures [Abstract]      
General corporate expenses (3,548) (6,608)  
Gain on disposition of assets 74 2,230  
Interest expense (13,151) (13,221)  
Other income 3,269 6,443  
Earnings before taxes on income (13,356) (11,156)  
Details of "Other" total assets [Abstract]      
General corporate assets 151,069   108,306
Investment in affiliates 2,856   2,576
Total other assets 153,925   110,882
Reporting Segments [Member] | Marine Transportation (KMT) [Member]      
Revenues [Abstract]      
Revenues 475,412 412,495  
Segment profit 82,983 43,036  
Total assets 4,464,945   4,454,931
Other segment disclosures [Abstract]      
Earnings before taxes on income 82,983 43,036  
Reporting Segments [Member] | Distribution and Services [Member]      
Revenues [Abstract]      
Revenues 332,610 337,949  
Segment profit 22,014 22,792  
Total assets 1,156,967   $ 1,156,384
Other segment disclosures [Abstract]      
Earnings before taxes on income 22,014 22,792  
Intersegment Eliminations [Member]      
Revenues [Abstract]      
Revenues 6,600 9,400  
Segment profit 700 900  
Other segment disclosures [Abstract]      
Earnings before taxes on income $ 700 $ 900