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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 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
segment
Sep. 30, 2013
Segment Reporting Information [Line Items]        
Number of reportable segments     1  
Revenue from unaffiliated customers $ 166,944 $ 135,717 $ 466,214 $ 358,583
Americas [Member]
       
Segment Reporting Information [Line Items]        
Revenue from unaffiliated customers 90,992 74,427 237,919 199,450
Germany [Member]
       
Segment Reporting Information [Line Items]        
Revenue from unaffiliated customers 19,843 11,039 63,230 36,236
Other EMEA [Member]
       
Segment Reporting Information [Line Items]        
Revenue from unaffiliated customers 27,364 21,728 73,556 56,966
Asia Pacific [Member]
       
Segment Reporting Information [Line Items]        
Revenue from unaffiliated customers $ 28,745 $ 28,523 $ 91,509 $ 65,931