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Segment Information (Schedule Of Intercompany Sales By Geographic Area) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Total revenue $ 176,568 $ 159,467 $ 342,437 $ 315,898
Intercompany Sales        
Total revenue 47,281 39,509 96,180 80,933
Americas | Intercompany Sales        
Total revenue 18,572 19,036 36,879 36,481
EMEA | Intercompany Sales        
Total revenue 19,615 13,481 41,977 31,535
Asia Pacific | Intercompany Sales        
Total revenue 9,094 6,992 17,324 12,917
Americas | Intercompany Sales        
Total revenue 21,973 15,397 43,661 32,401
Americas | Americas | Operating Segments        
Total revenue 738 537 1,022 898
Americas | EMEA | Operating Segments        
Total revenue 14,243 9,905 30,224 22,650
Americas | Asia Pacific | Operating Segments        
Total revenue 6,992 4,955 12,415 8,853
EMEA        
Total revenue 56,859 53,449 114,280 106,407
EMEA | Intercompany Sales        
Total revenue 23,207 22,613 48,100 45,347
EMEA | Americas | Operating Segments        
Total revenue 16,611 18,157 33,212 34,704
EMEA | EMEA | Operating Segments        
Total revenue 5,372 3,554 11,752 8,728
EMEA | Asia Pacific | Operating Segments        
Total revenue 1,224 902 3,136 1,915
Asia Pacific        
Total revenue 31,453 22,750 55,371 45,932
Asia Pacific | Intercompany Sales        
Total revenue 2,101 1,499 4,419 3,185
Asia Pacific | Americas | Operating Segments        
Total revenue 1,223 342 2,645 879
Asia Pacific | EMEA | Operating Segments        
Total revenue 0 22 1 157
Asia Pacific | Asia Pacific | Operating Segments        
Total revenue 878 1,135 1,773 2,149
United States        
Total revenue $ 86,028 $ 80,921 $ 168,741 $ 158,793