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Segment Information (Schedule Of Revenue From Unaffiliated Customers By Product And Service) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Revenue | $ 152,907 | $ 156,362 | $ 468,805 | $ 467,028
Operating Segments [Member] |  |  |  |
Revenue | 152,907 | 156,362 | 468,805 | 467,028
Operating Segments [Member] | Products [Member] |  |  |  |
Revenue | 48,227 | 56,484 | 150,681 | 163,301
Operating Segments [Member] | Materials [Member] |  |  |  |
Revenue | 39,399 | 38,059 | 126,096 | 117,105
Operating Segments [Member] | Services [Member] |  |  |  |
Revenue | $ 65,281 | $ 61,819 | $ 192,028 | $ 186,622

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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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