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Segment Information (Schedule Of Capital Expenditures By Geographic Area) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Segment Reporting Information [Line Items]      
Capital expenditures $ 16,567 $ 22,399 $ 22,727
Americas [Member]      
Segment Reporting Information [Line Items]      
Capital expenditures 8,172 14,062 18,187
Germany [Member]      
Segment Reporting Information [Line Items]      
Capital expenditures 307 613 235
Other EMEA [Member]      
Segment Reporting Information [Line Items]      
Capital expenditures 5,640 6,856 3,680
Asia Pacific [Member]      
Segment Reporting Information [Line Items]      
Capital expenditures $ 2,448 $ 868 $ 625