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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
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Segment Reporting Information [Line Items]      
Total operating profit from segments above $ 412,664 $ 401,673 $ 301,853
Noncontrolling interest reflected in segments 0 0 350
Income from operations 358,213 352,784 248,409
Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Total operating profit from segments above 412,664 401,673 301,853
Corporate, Non-Segment [Member]      
Segment Reporting Information [Line Items]      
Corporate overhead expenses (54,451) (48,889) (53,733)
Segment Reconciling Items [Member]      
Segment Reporting Information [Line Items]      
Noncontrolling interest reflected in segments $ 0 $ 0 $ 289