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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 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Segment Reporting Information [Line Items]        
Total operating profit from segments above $ 107,375 $ 108,689 $ 207,234 $ 215,118
Income from operations 93,523 95,918 180,335 188,988
Operating Segments [Member]        
Segment Reporting Information [Line Items]        
Total operating profit from segments above 107,375 108,689 207,234 215,118
Corporate, Non-Segment [Member]        
Segment Reporting Information [Line Items]        
Corporate overhead expenses $ (13,852) $ (12,771) $ (26,899) $ (26,130)