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Business Segment Information (Reconciliation of Total Operating Profit) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Segment Reporting Information [Line Items]    
Total operating profit from segments $ 131,258 $ 108,122
Income from operations 116,316 93,517
Operating Segments [Member]    
Segment Reporting Information [Line Items]    
Total operating profit from segments 131,258 108,122
Corporate, Non-Segment [Member]    
Segment Reporting Information [Line Items]    
Corporate overhead expenses $ (14,942) $ (14,605)