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Segment Information (Schedule Of Depreciation And Amortization By Geographic Area) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Segment Reporting Information [Line Items]      
Depreciation and amortization $ 60,535 $ 83,069 $ 55,188
Americas [Member]      
Segment Reporting Information [Line Items]      
Depreciation and amortization 25,892 43,613 38,876
Germany [Member]      
Segment Reporting Information [Line Items]      
Depreciation and amortization 881 1,011 1,075
Other EMEA [Member]      
Segment Reporting Information [Line Items]      
Depreciation and amortization 29,065 33,585 11,427
Asia Pacific [Member]      
Segment Reporting Information [Line Items]      
Depreciation and amortization $ 4,697 $ 4,860 $ 3,810