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Segment Information (Schedule Of Revenue From Unaffiliated Customers By Product And Service) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Revenue | $ 158,111 | $ 170,504 | $ 310,666 | $ 331,226
Operating Segments [Member] | Products [Member] |  |  |  |
Revenue | 54,322 | 68,176 | 106,817 | 130,891
Operating Segments [Member] | Materials [Member] |  |  |  |
Revenue | 40,577 | 36,401 | 79,046 | 73,508
Operating Segments [Member] | Services [Member] |  |  |  |
Revenue | $ 63,212 | $ 65,927 | $ 124,803 | $ 126,827

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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=26872669&loc=d3e20235-122688 + Details
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