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Segment Information (Schedule Of Assets By Geographic Area) (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Segment Reporting Information [Line Items]      
Assets $ 893,275 $ 1,530,310 $ 1,097,856
Americas [Member]      
Segment Reporting Information [Line Items]      
Assets 384,054 1,018,113 870,208
Germany [Member]      
Segment Reporting Information [Line Items]      
Assets 36,782 47,524 38,685
Other EMEA [Member]      
Segment Reporting Information [Line Items]      
Assets 369,302 384,830 120,562
Asia Pacific [Member]      
Segment Reporting Information [Line Items]      
Assets $ 103,137 $ 79,843 $ 68,401