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Segment Information (Schedule Of Revenue From Unaffiliated Customers By Geographic Area) (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($) segment	Sep. 30, 2016 USD ($)
Number of reportable segments | segment			1
Revenue from unaffiliated customers	$ 152,907	$ 156,362	$ 468,805	$ 467,028
Operating Segments [Member]
Revenue from unaffiliated customers	152,907	156,362	468,805	467,028
Operating Segments [Member] | United States [Member]
Revenue from unaffiliated customers	75,402	84,768	234,195	246,150
Operating Segments [Member] | Other Americas [Member]
Revenue from unaffiliated customers	3,534	2,122	8,300	7,831
Operating Segments [Member] | Germany [Member]
Revenue from unaffiliated customers	20,761	16,796	60,908	56,225
Operating Segments [Member] | Other EMEA [Member]
Revenue from unaffiliated customers	31,696	26,948	97,956	83,704
Operating Segments [Member] | Asia Pacific [Member]
Revenue from unaffiliated customers	$ 21,514	$ 25,728	$ 67,446	$ 73,118

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- 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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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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