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Segment Information (Schedule Of Intercompany Sales By Geographic Area) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Total revenue $ 151,980 $ 165,869
Intercompany Sales    
Total revenue 47,744 48,891
Americas | Intercompany Sales    
Total revenue 17,869 18,306
EMEA | Intercompany Sales    
Total revenue 23,665 22,356
Asia Pacific | Intercompany Sales    
Total revenue 6,210 8,229
Americas | Intercompany Sales    
Total revenue 20,991 21,684
Americas | Americas | Operating Segments    
Total revenue 446 283
Americas | EMEA | Operating Segments    
Total revenue 16,708 15,979
Americas | Asia Pacific | Operating Segments    
Total revenue 3,837 5,422
EMEA    
Total revenue 59,644 57,421
EMEA | Intercompany Sales    
Total revenue 25,186 24,889
EMEA | Americas | Operating Segments    
Total revenue 16,678 16,601
EMEA | EMEA | Operating Segments    
Total revenue 6,936 6,376
EMEA | Asia Pacific | Operating Segments    
Total revenue 1,572 1,912
Asia Pacific    
Total revenue 18,633 23,918
Asia Pacific | Intercompany Sales    
Total revenue 1,567 2,318
Asia Pacific | Americas | Operating Segments    
Total revenue 745 1,422
Asia Pacific | EMEA | Operating Segments    
Total revenue 21 1
Asia Pacific | Asia Pacific | Operating Segments    
Total revenue $ 801 $ 895