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Properties And Equipment (Schedule Of Properties And Equipment) (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Property, Plant and Equipment [Line Items]    
Total properties and equipment $ 535,634 $ 511,591
Less accumulated depreciation (335,920) (317,911)
Net properties and equipment 199,714 193,680
Land [Member]    
Property, Plant and Equipment [Line Items]    
Total properties and equipment 11,862 11,348
Buildings and Building Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Total properties and equipment 123,845 122,762
Transportation Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Total properties and equipment 79,810 73,322
Machinery And Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Total properties and equipment 154,603 143,335
Computer Software [Member]    
Property, Plant and Equipment [Line Items]    
Total properties and equipment 69,283 64,064
Furniture And Fixtures [Member]    
Property, Plant and Equipment [Line Items]    
Total properties and equipment 76,042 78,979
Projects Under Development [Member]    
Property, Plant and Equipment [Line Items]    
Total properties and equipment $ 20,189 $ 17,781