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Segment Information (Schedule Of Revenue From Unaffiliated Customers By Geographic Area) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Segment Reporting Information [Line Items]        
Revenue from unaffiliated customers $ 170,504 $ 151,512 $ 331,226 $ 299,270
Americas [Member]        
Segment Reporting Information [Line Items]        
Revenue from unaffiliated customers 90,396 78,895 176,658 146,927
Germany [Member]        
Segment Reporting Information [Line Items]        
Revenue from unaffiliated customers 21,345 19,562 42,595 43,387
Other EMEA [Member]        
Segment Reporting Information [Line Items]        
Revenue from unaffiliated customers 30,958 22,453 58,412 46,192
Asia Pacific [Member]        
Segment Reporting Information [Line Items]        
Revenue from unaffiliated customers $ 27,805 $ 30,602 $ 53,561 $ 62,764