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Segment Information (Schedule Of Intercompany Sales By Geographic Area) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Intercompany sales $ 156,431 $ 152,555
Intercompany Sales [Member]    
Intercompany sales 41,424 31,764
Americas [Member] | Intercompany Sales [Member]    
Intercompany sales 17,445 15,122
Germany [Member] | Intercompany Sales [Member]    
Intercompany sales 10,951 7,034
Other EMEA [Member] | Intercompany Sales [Member]    
Intercompany sales 7,103 4,600
Asia Pacific [Member] | Intercompany Sales [Member]    
Intercompany sales 5,925 5,008
Americas [Member] | Operating Segments [Member]    
Intercompany sales 80,291 83,490
Americas [Member] | Intercompany Sales [Member]    
Intercompany sales 17,004 12,711
Americas [Member] | Americas [Member] | Operating Segments [Member]    
Intercompany sales 361 289
Americas [Member] | Germany [Member] | Operating Segments [Member]    
Intercompany sales 9,791 6,201
Americas [Member] | Other EMEA [Member] | Operating Segments [Member]    
Intercompany sales 2,954 3,265
Americas [Member] | Asia Pacific [Member] | Operating Segments [Member]    
Intercompany sales 3,898 2,956
Germany [Member] | Operating Segments [Member]    
Intercompany sales 19,816 18,882
Germany [Member] | Intercompany Sales [Member]    
Intercompany sales 1,833 1,085
Germany [Member] | Americas [Member] | Operating Segments [Member]    
Intercompany sales 16 634
Germany [Member] | Other EMEA [Member] | Operating Segments [Member]    
Intercompany sales 1,815 451
Germany [Member] | Asia Pacific [Member] | Operating Segments [Member]    
Intercompany sales 2  
Other EMEA [Member] | Operating Segments [Member]    
Intercompany sales 33,142 28,549
Other EMEA [Member] | Intercompany Sales [Member]    
Intercompany sales 20,901 16,044
Other EMEA [Member] | Americas [Member] | Operating Segments [Member]    
Intercompany sales 16,531 13,169
Other EMEA [Member] | Germany [Member] | Operating Segments [Member]    
Intercompany sales 1,160 833
Other EMEA [Member] | Other EMEA [Member] | Operating Segments [Member]    
Intercompany sales 2,199 881
Other EMEA [Member] | Asia Pacific [Member] | Operating Segments [Member]    
Intercompany sales 1,011 1,161
Asia Pacific [Member] | Operating Segments [Member]    
Intercompany sales 23,182 21,634
Asia Pacific [Member] | Intercompany Sales [Member]    
Intercompany sales 1,686 1,924
Asia Pacific [Member] | Americas [Member] | Operating Segments [Member]    
Intercompany sales 537 1,030
Asia Pacific [Member] | Other EMEA [Member] | Operating Segments [Member]    
Intercompany sales 135 3
Asia Pacific [Member] | Asia Pacific [Member] | Operating Segments [Member]    
Intercompany sales $ 1,014 $ 891