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Properties And Equipment (Schedule Of Properties And Equipment) (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Property, Plant and Equipment [Line Items]    
Total properties and equipment $ 558,712 $ 535,634
Less accumulated depreciation (354,872) (335,920)
Net properties and equipment 203,840 199,714
Land [Member]    
Property, Plant and Equipment [Line Items]    
Total properties and equipment 14,356 11,862
Buildings and Building Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Total properties and equipment 130,695 123,845
Transportation Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Total properties and equipment 89,910 79,810
Machinery And Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Total properties and equipment 164,249 154,603
Computer Software [Member]    
Property, Plant and Equipment [Line Items]    
Total properties and equipment 72,646 69,283
Furniture And Fixtures [Member]    
Property, Plant and Equipment [Line Items]    
Total properties and equipment 78,068 76,042
Projects Under Development [Member]    
Property, Plant and Equipment [Line Items]    
Total properties and equipment $ 8,788 $ 20,189