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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, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Total operating profit from segments above	$ 507,634	$ 460,778	$ 435,011
Income from operations	441,988	396,944	375,694
Operating Segments
Segment Reporting Information [Line Items]
Total operating profit from segments above	507,634	460,778	435,011
Corporate, Non-Segment
Segment Reporting Information [Line Items]
Corporate overhead expenses	$ (65,646)	$ (63,834)	$ (59,317)

X

- Definition

The aggregate total of expenses of managing and administering the affairs of an entity, including affiliates of the reporting entity, which are not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.4)
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+ References

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-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
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