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Segment Information (Schedule Of Revenue From Unaffiliated Customers By Geographic Area) (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
segment
Sep. 30, 2017
USD ($)
Number of reportable segments | segment     1  
Revenue from unaffiliated customers $ 164,511 $ 152,907 $ 506,948 $ 468,805
United States        
Revenue from unaffiliated customers 81,282 75,402 250,023 234,195
Other Americas        
Revenue from unaffiliated customers 873 3,534 4,918 8,300
EMEA        
Revenue from unaffiliated customers 55,020 52,457 169,300 158,864
Asia Pacific        
Revenue from unaffiliated customers $ 27,336 $ 21,514 $ 82,707 $ 67,446