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Segment Information (Schedule Of Revenue From Unaffiliated Customers By Geographic Area) (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2016 USD ($) segment	Jun. 30, 2015 USD ($)
Number of reportable business segments | segment			1
Revenue from unaffiliated customers	$ 158,111	$ 170,504	$ 310,666	$ 331,226
Operating Segments [Member] | Americas [Member]
Revenue from unaffiliated customers	83,601	90,396	167,091	176,658
Operating Segments [Member] | Germany [Member]
Revenue from unaffiliated customers	20,547	21,345	39,429	42,595
Operating Segments [Member] | Other EMEA [Member]
Revenue from unaffiliated customers	28,207	30,958	56,756	58,412
Operating Segments [Member] | Asia Pacific [Member]
Revenue from unaffiliated customers	$ 25,756	$ 27,805	$ 47,390	$ 53,561

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

No definition available.

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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=26872669&loc=d3e20235-122688

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