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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

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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- Details

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