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Business Segment Information (Reconciliation Of Total Operating Profit Reported For Business Segments To Income From Operations In Consolidated Statements Of Operations) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Segment Reporting Information [Line Items]        
Total operating profit from segments above $ 114,730 $ 113,159 $ 335,811 $ 320,393
Income from operations 99,237 97,218 289,981 277,553
Operating Segments [Member]        
Segment Reporting Information [Line Items]        
Total operating profit from segments above 114,730 113,159 335,811 320,393
Corporate, Non-Segment [Member]        
Segment Reporting Information [Line Items]        
Corporate overhead expenses $ (15,493) $ (15,941) $ (45,830) $ (42,840)