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Acquisitions and Dispositions of Businesses (Acquisitions) (Narrative) (Details) $ in Thousands	1 Months Ended			3 Months Ended	9 Months Ended	12 Months Ended
	Jun. 30, 2025 business	May 31, 2024 business	Jan. 31, 2024 business	Sep. 30, 2025 USD ($)	Sep. 30, 2025 USD ($) business	Dec. 31, 2024 USD ($) business	Oct. 21, 2025 USD ($)	Jul. 31, 2025
Business Combination [Line Items]
Floor plan payables				$ 119,987	$ 119,987	$ 147,884
Number of businesses acquired \| business					2	2
Acquisition purchase price					$ 19,900
Net pension obligations				107,400	107,400
Acquisition-related costs				2,000	2,000
Goodwill expected to be deductible for income tax purposes				1,300	1,300
Revenues of acquired companies since acquisition date				25,700	25,700
Operating losses of acquired companies since acquisition date				$ (1,200)	$ (1,300)
Education [Member]
Business Combination [Line Items]
Number of businesses acquired \| business					1
Education [Member] \| Supplemental Education [Member]
Business Combination [Line Items]
Number of businesses acquired \| business	1
Education [Member] \| Kaplan International [Member]
Business Combination [Line Items]
Number of businesses acquired \| business		1
Manufacturing [Member]
Business Combination [Line Items]
Number of businesses acquired \| business					1
Other Businesses [Member]
Business Combination [Line Items]
Number of businesses acquired \| business			1
Arconic Architectural Products, LLC [Member] \| Manufacturing [Member] \| Hoover Treated Wood Products [Member]
Business Combination [Line Items]
Percentage of interest acquired								100.00%
Honda auto dealership [Member] \| Automotive [Member] \| Subsequent Event [Member]
Business Combination [Line Items]
Floor plan payables							$ 4,900
Honda auto dealership [Member] \| Delayed Draw Term Loan maturing in 2028 - $50 million [Member] \| Automotive [Member] \| Subsequent Event [Member]
Business Combination [Line Items]
Amount borrowed to finance business acquisition							$ 38,700