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Segment Information (Schedule Of Revenue From Unaffiliated Customers By Geographic Area) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2017 USD ($) segment	Mar. 31, 2016 USD ($)
Number of reportable segments | segment	1
Revenue from unaffiliated customers	$ 156,431	$ 152,555
Operating Segments [Member] | Americas [Member]
Revenue from unaffiliated customers	80,291	83,490
Operating Segments [Member] | Germany [Member]
Revenue from unaffiliated customers	19,816	18,882
Operating Segments [Member] | Other EMEA [Member]
Revenue from unaffiliated customers	33,142	28,549
Operating Segments [Member] | Asia Pacific [Member]
Revenue from unaffiliated customers	$ 23,182	$ 21,634

X

- Definition

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

+ References

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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

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