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Properties And Equipment (Schedule Of Properties And Equipment) (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Property, Plant and Equipment [Line Items]    
Total properties and equipment $ 511,591 $ 481,200
Less accumulated depreciation (317,911) (293,380)
Net properties and equipment 193,680 187,820
Land [Member]    
Property, Plant and Equipment [Line Items]    
Total properties and equipment 11,348 9,385
Buildings and Building Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Total properties and equipment 122,762 117,419
Transportation Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Total properties and equipment 73,322 68,379
Machinery And Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Total properties and equipment 143,335 129,835
Computer Software [Member]    
Property, Plant and Equipment [Line Items]    
Total properties and equipment 64,064 62,138
Furniture And Fixtures [Member]    
Property, Plant and Equipment [Line Items]    
Total properties and equipment 78,979 78,507
Projects Under Development [Member]    
Property, Plant and Equipment [Line Items]    
Total properties and equipment $ 17,781 $ 15,537