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Segment Information (Schedule Of Assets By Geographic Area) (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Segment Reporting Information [Line Items]    
Assets $ 1,481,509 $ 1,525,970
Americas [Member]    
Segment Reporting Information [Line Items]    
Assets 918,427 1,018,113
Germany [Member]    
Segment Reporting Information [Line Items]    
Assets 57,275 47,524
Other EMEA [Member]    
Segment Reporting Information [Line Items]    
Assets 404,748 382,259
Asia Pacific [Member]    
Segment Reporting Information [Line Items]    
Assets $ 101,059 $ 78,074