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Segment Information (Schedule Of Intercompany Sales By Geographic Area) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Total revenue $ 155,272 $ 164,511 $ 464,524 $ 506,948
Intercompany Sales        
Total revenue 43,776 49,748 141,277 145,928
Americas | Intercompany Sales        
Total revenue 16,103 19,892 53,975 56,771
EMEA | Intercompany Sales        
Total revenue 20,607 22,494 67,965 64,471
Asia Pacific | Intercompany Sales        
Total revenue 7,066 7,362 19,337 24,686
Americas | Intercompany Sales        
Total revenue 12,832 20,927 47,742 64,588
Americas | Americas | Operating Segments        
Total revenue 371 499 1,361 1,521
Americas | EMEA | Operating Segments        
Total revenue 7,730 15,540 33,193 45,764
Americas | Asia Pacific | Operating Segments        
Total revenue 4,731 4,888 13,188 17,303
EMEA        
Total revenue 60,356 55,020 175,776 169,300
EMEA | Intercompany Sales        
Total revenue 27,590 26,749 87,209 74,849
EMEA | Americas | Operating Segments        
Total revenue 14,001 18,259 49,438 51,471
EMEA | EMEA | Operating Segments        
Total revenue 12,067 6,939 33,923 18,691
EMEA | Asia Pacific | Operating Segments        
Total revenue 1,522 1,551 3,848 4,687
Asia Pacific        
Total revenue 17,090 27,336 54,407 82,707
Asia Pacific | Intercompany Sales        
Total revenue 3,354 2,072 6,326 6,491
Asia Pacific | Americas | Operating Segments        
Total revenue 1,731 1,134 3,176 3,779
Asia Pacific | EMEA | Operating Segments        
Total revenue 810 15 849 16
Asia Pacific | Asia Pacific | Operating Segments        
Total revenue $ 813 $ 923 $ 2,301 $ 2,696