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Summary of Significant Accounting Policies, Goodwill and Other Intangibles (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract]      
Balance (gross) $ 1,065,939    
Accumulated impairment and amortization (627,191)    
Balance 438,748    
Balance (gross)   $ 1,065,939  
Accumulated impairment and amortization (627,191) (627,191)  
Balance 438,748 438,748  
Intangible Assets, Net (Excluding Goodwill) [Abstract]      
Other intangible assets - gross 184,622 203,242  
Accumulated amortization (141,695) (151,779)  
Other intangible assets - net 42,927 51,463  
Other intangible liabilities - gross 8,800 13,860  
Accumulated amortization (8,800) (13,280)  
Other intangible liabilities - net 0 580  
Amortization of Intangible Assets 8,100 7,600 $ 7,800
Intangible Assets and liabilities, Estimated Amortization Expense, Fiscal Year Maturity [Abstract]      
2024 8,500    
2025 8,500    
2026 6,300    
2027 5,000    
2028 3,500    
Thereafter $ 11,100    
Weighted average amortization period for intangible assets and liabilities 7 years    
Marine Transportation Segment [Member]      
Goodwill and Intangible Assets Disclosure [Abstract]      
Balance (gross) $ 505,784    
Accumulated impairment and amortization (237,626)    
Balance 268,158    
Balance (gross)   505,784  
Accumulated impairment and amortization (237,626) (237,626)  
Balance 268,158 268,158  
Distribution and Services Segment [Member]      
Goodwill and Intangible Assets Disclosure [Abstract]      
Balance (gross) 560,155    
Accumulated impairment and amortization (389,565)    
Balance 170,590    
Balance (gross)   560,155  
Accumulated impairment and amortization (389,565) (389,565)  
Balance $ 170,590 $ 170,590