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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)

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- 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.4) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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