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Segment Information (Schedule Of Revenue From Unaffiliated Customers By Product And Service) (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2017 | Mar. 31, 2016
Revenue | $ 156,431 | $ 152,555
Operating Segments [Member] | Products [Member] |  |
Revenue | 51,906 | 52,495
Operating Segments [Member] | Materials [Member] |  |
Revenue | 42,824 | 38,469
Operating Segments [Member] | Services [Member] |  |
Revenue | $ 61,701 | $ 61,591

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- Definition Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. + 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 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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