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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, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Total revenue $ 157,272 $ 176,568 $ 309,252 $ 342,437
Intercompany Sales        
Total revenue 49,752 47,281 97,499 96,180
Americas | Intercompany Sales        
Total revenue 19,999 18,572 37,868 36,879
EMEA | Intercompany Sales        
Total revenue 23,689 19,615 47,360 41,977
Asia Pacific | Intercompany Sales        
Total revenue 6,064 9,094 12,271 17,324
Americas | Intercompany Sales        
Total revenue 13,921 21,973 34,911 43,661
Americas | Americas | Operating Segments        
Total revenue 544 738 990 1,022
Americas | EMEA | Operating Segments        
Total revenue 8,757 14,243 25,465 30,224
Americas | Asia Pacific | Operating Segments        
Total revenue 4,620 6,992 8,456 12,415
EMEA        
Total revenue 55,776 56,859 115,420 114,280
EMEA | Intercompany Sales        
Total revenue 34,429 23,207 59,616 48,100
EMEA | Americas | Operating Segments        
Total revenue 18,758 16,611 35,434 33,212
EMEA | EMEA | Operating Segments        
Total revenue 14,914 5,372 21,856 11,752
EMEA | Asia Pacific | Operating Segments        
Total revenue 757 1,224 2,326 3,136
Asia Pacific        
Total revenue 18,684 31,453 37,316 55,371
Asia Pacific | Intercompany Sales        
Total revenue 1,402 2,101 2,972 4,419
Asia Pacific | Americas | Operating Segments        
Total revenue 697 1,223 1,444 2,645
Asia Pacific | EMEA | Operating Segments        
Total revenue 18 0 39 1
Asia Pacific | Asia Pacific | Operating Segments        
Total revenue $ 687 $ 878 $ 1,489 $ 1,773