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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, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Intercompany sales $ 152,907 $ 156,362 $ 468,805 $ 467,028
Operating Segments [Member]        
Intercompany sales 152,907 156,362 468,805 467,028
Intercompany Sales [Member]        
Intercompany sales 40,429 36,378 121,362 112,459
Americas [Member] | Intercompany Sales [Member]        
Intercompany sales 17,224 16,551 53,705 52,831
Germany [Member] | Intercompany Sales [Member]        
Intercompany sales 11,445 6,725 31,098 23,117
Other EMEA [Member] | Intercompany Sales [Member]        
Intercompany sales 4,613 4,569 16,495 14,300
Asia Pacific [Member] | Intercompany Sales [Member]        
Intercompany sales 7,147 8,533 20,064 22,211
Americas [Member] | Intercompany Sales [Member]        
Intercompany sales 17,708 15,462 50,109 47,583
Americas [Member] | Americas [Member] | Operating Segments [Member]        
Intercompany sales 554 733 1,452 2,011
Americas [Member] | Germany [Member] | Operating Segments [Member]        
Intercompany sales 9,439 6,163 27,147 21,377
Americas [Member] | Other EMEA [Member] | Operating Segments [Member]        
Intercompany sales 2,325 2,244 7,267 8,313
Americas [Member] | Asia Pacific [Member] | Operating Segments [Member]        
Intercompany sales 5,390 6,322 14,243 15,882
Germany [Member] | Operating Segments [Member]        
Intercompany sales 20,761 16,796 60,908 56,225
Germany [Member] | Intercompany Sales [Member]        
Intercompany sales 2,849 1,321 7,042 6,027
Germany [Member] | Americas [Member] | Operating Segments [Member]        
Intercompany sales 945 240 1,434 3,604
Germany [Member] | Other EMEA [Member] | Operating Segments [Member]        
Intercompany sales 1,645 976 5,347 2,254
Germany [Member] | Asia Pacific [Member] | Operating Segments [Member]        
Intercompany sales 259 105 261 169
Other EMEA [Member] | Operating Segments [Member]        
Intercompany sales 31,696 26,948 97,956 83,704
Other EMEA [Member] | Intercompany Sales [Member]        
Intercompany sales 18,479 17,823 59,633 53,588
Other EMEA [Member] | Americas [Member] | Operating Segments [Member]        
Intercompany sales 15,112 14,972 49,327 44,946
Other EMEA [Member] | Germany [Member] | Operating Segments [Member]        
Intercompany sales 2,006 562 3,951 1,740
Other EMEA [Member] | Other EMEA [Member] | Operating Segments [Member]        
Intercompany sales 635 1,236 3,716 3,601
Other EMEA [Member] | Asia Pacific [Member] | Operating Segments [Member]        
Intercompany sales 726 1,053 2,639 3,301
Asia Pacific [Member] | Operating Segments [Member]        
Intercompany sales 21,514 25,728 67,446 73,118
Asia Pacific [Member] | Intercompany Sales [Member]        
Intercompany sales 1,393 1,772 4,578 5,261
Asia Pacific [Member] | Americas [Member] | Operating Segments [Member]        
Intercompany sales 613 606 1,492 2,270
Asia Pacific [Member] | Other EMEA [Member] | Operating Segments [Member]        
Intercompany sales 8 113 165 132
Asia Pacific [Member] | Asia Pacific [Member] | Operating Segments [Member]        
Intercompany sales 772 1,053 2,921 2,859
United States [Member] | Operating Segments [Member]        
Intercompany sales $ 75,402 $ 84,768 $ 234,195 $ 246,150