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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, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Segment Reporting Information [Line Items]        
Total operating profit from segments above $ 99,874 $ 103,488 $ 314,992 $ 298,833
Income from operations 87,018 90,498 276,006 262,520
Operating Segments [Member]        
Segment Reporting Information [Line Items]        
Total operating profit from segments above 99,874 103,488 314,992 298,833
Corporate, Non-Segment [Member]        
Segment Reporting Information [Line Items]        
Corporate overhead expenses $ (12,856) $ (12,990) $ (38,986) $ (36,313)