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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, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Revenue	$ 159,467	$ 158,111	$ 315,898	$ 310,666
Operating Segments [Member]
Revenue	159,467	158,111	315,898	310,666
Operating Segments [Member] | Products [Member]
Revenue	50,547	54,322	102,454	106,817
Operating Segments [Member] | Materials [Member]
Revenue	43,874	40,577	86,697	79,046
Operating Segments [Member] | Services [Member]
Revenue	$ 65,046	$ 63,212	$ 126,747	$ 124,803

X

- 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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- Details

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- Details

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