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Segment Information (Schedule Of Revenue From Unaffiliated Customers By Geographic Area) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013 segment	Dec. 31, 2012	Dec. 31, 2011
Segment Reporting Information [Line Items]
Number of reportable segments									1
Revenue from unaffiliated customers	$ 154,817	$ 135,717	$ 120,787	$ 102,079	$ 101,571	$ 90,532	$ 83,610	$ 77,920	$ 513,400	$ 353,633	$ 230,423
United States [Member]
Segment Reporting Information [Line Items]
Revenue from unaffiliated customers									284,752	196,414	117,739
Germany [Member]
Segment Reporting Information [Line Items]
Revenue from unaffiliated customers									51,245	39,748	34,978
Other Europe [Member]
Segment Reporting Information [Line Items]
Revenue from unaffiliated customers									82,536	60,939	48,346
Asia Pacific [Member]
Segment Reporting Information [Line Items]
Revenue from unaffiliated customers									$ 94,867	$ 56,532	$ 29,360

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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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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