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Segment Information (Schedule Of Revenue From Unaffiliated Customers By Product And Service) (Details) - USD ($) $ in Thousands	3 Months Ended												12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting Information [Line Items]
Revenue	$ 183,363	$ 151,574	$ 170,504	$ 160,722	$ 187,438	$ 166,944	$ 151,512	$ 147,758	$ 154,817	$ 135,717	$ 120,787	$ 102,079	$ 666,163	$ 653,652	$ 513,400
Products [Member]
Segment Reporting Information [Line Items]
Revenue													257,379	283,339	227,627
Materials [Member]
Segment Reporting Information [Line Items]
Revenue													150,740	158,859	128,405
Services [Member]
Segment Reporting Information [Line Items]
Revenue													$ 258,044	$ 211,454	$ 157,368

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=26872669&loc=d3e20235-122688

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 1
-Article 5

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- Definition

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+ References

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