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Segment Information (Schedule Of Intercompany Sales By Geographic Area) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Intercompany sales $ 165,888 $ 156,431
Intercompany Sales    
Intercompany sales 47,839 41,424
Americas | Intercompany Sales    
Intercompany sales 18,307 17,445
EMEA | Intercompany Sales    
Intercompany sales 21,303 18,054
Asia Pacific | Intercompany Sales    
Intercompany sales 8,229 5,925
Americas | Intercompany Sales    
Intercompany sales 21,203 17,004
Americas | Americas | Operating Segments    
Intercompany sales 283 361
Americas | EMEA | Operating Segments    
Intercompany sales 15,498 12,745
Americas | Asia Pacific | Operating Segments    
Intercompany sales 5,422 3,898
EMEA    
Intercompany sales 57,416 52,958
EMEA | Intercompany Sales    
Intercompany sales 24,318 22,734
EMEA | Americas | Operating Segments    
Intercompany sales 16,603 16,547
EMEA | EMEA | Operating Segments    
Intercompany sales 5,804 5,174
EMEA | Asia Pacific | Operating Segments    
Intercompany sales 1,911 1,013
Asia Pacific    
Intercompany sales 23,925 23,182
Asia Pacific | Intercompany Sales    
Intercompany sales 2,318 1,686
Asia Pacific | Americas | Operating Segments    
Intercompany sales 1,421 537
Asia Pacific | EMEA | Operating Segments    
Intercompany sales 1 135
Asia Pacific | Asia Pacific | Operating Segments    
Intercompany sales 896 1,014
United States    
Intercompany sales $ 82,730 $ 77,872