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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, 2018 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($) segment	Jun. 30, 2017 USD ($)
Number of reportable segments | segment			1
Revenue from unaffiliated customers	$ 176,568	$ 159,467	$ 342,437	$ 315,898
United States
Revenue from unaffiliated customers	86,028	80,921	168,741	158,793
Other Americas
Revenue from unaffiliated customers	2,228	2,347	4,045	4,766
EMEA
Revenue from unaffiliated customers	56,859	53,449	114,280	106,407
Asia Pacific
Revenue from unaffiliated customers	$ 31,453	$ 22,750	$ 55,371	$ 45,932

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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.

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
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-Name Accounting Standards Codification
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045

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