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Acquisitions and Dispositions of Businesses (Acquisitions) (Narrative) (Details)
$ in Thousands
1 Months Ended 12 Months Ended
Jan. 31, 2024
business
Dec. 31, 2023
USD ($)
business
Jul. 31, 2023
business
Jan. 31, 2023
business
Dec. 31, 2023
USD ($)
business
Mar. 31, 2024
USD ($)
Sep. 30, 2023
USD ($)
Business Acquisition [Line Items]              
Acquisition purchase price         $ 83,300    
Vehicle floor plan payable   $ 148,300     148,300 $ 175,103  
Goodwill expected to be deductible for income tax purposes   $ 45,000     $ 45,000    
Number of businesses acquired | business         5    
Automotive [Member]              
Business Acquisition [Line Items]              
Number of businesses acquired | business         1    
Graham Healthcare Group [Member]              
Business Acquisition [Line Items]              
Number of businesses acquired | business   1   2 3    
Other Segments              
Business Acquisition [Line Items]              
Number of businesses acquired | business 1   1   1    
CSI Pharmacy Holding Company, LLC              
Business Acquisition [Line Items]              
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests   $ 20,000          
CSI Pharmacy Holding Company, LLC | Promissory Note for CSI Minority Shares              
Business Acquisition [Line Items]              
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests   $ 15,000          
Interest rate   8.00%     8.00%    
CSI Pharmacy Holding Company, LLC | Cash Paid for CSI Minority Shares              
Business Acquisition [Line Items]              
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests   $ 5,000          
Graham Holdings Company [Member] | CSI Pharmacy Holding Company, LLC              
Business Acquisition [Line Items]              
Percentage Ownership After Change in Noncontrolling Interest           86.70%  
Auto dealerships [Member] | Automotive [Member]              
Business Acquisition [Line Items]              
Amount Borrowed to Finance Business Acquisition             $ 37,000
Vehicle floor plan payable             $ 2,200