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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 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Segment Reporting Information [Line Items]        
Revenue from unaffiliated customers $ 151,512 $ 120,787 $ 299,270 $ 222,866
United States [Member]
       
Segment Reporting Information [Line Items]        
Revenue from unaffiliated customers 78,895 67,870 146,927 125,023
Germany [Member]
       
Segment Reporting Information [Line Items]        
Revenue from unaffiliated customers 19,562 13,286 43,387 25,197
Other Europe [Member]
       
Segment Reporting Information [Line Items]        
Revenue from unaffiliated customers 22,453 18,569 46,192 35,238
Asia Pacific [Member]
       
Segment Reporting Information [Line Items]        
Revenue from unaffiliated customers $ 30,602 $ 21,062 $ 62,764 $ 37,408