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Business Segment Information (Reconciliation of Total Operating Profit) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Segment Reporting Information [Line Items]
Total operating profit from segments	$ 127,362	$ 114,730	$ 385,424	$ 335,811
Income from operations	112,420	99,237	339,026	289,981
Operating Segments
Segment Reporting Information [Line Items]
Total operating profit from segments	127,362	114,730	385,424	335,811
Corporate
Segment Reporting Information [Line Items]
Corporate overhead expenses	$ (14,942)	$ (15,493)	$ (46,398)	$ (45,830)

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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-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
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No definition available.

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