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Segment Information (Schedule Of Income Or Loss From Operations By Geographic Area) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Segment Reporting Information [Line Items]        
Income (loss) from operations $ 8,208 $ 28,570 $ 22,087 $ 62,885
Subtotal [Member]
       
Segment Reporting Information [Line Items]        
Income (loss) from operations 8,311 28,687 22,940 63,736
Inter-Segment Elimination [Member]
       
Segment Reporting Information [Line Items]        
Income (loss) from operations (103) (117) (853) (851)
Americas [Member]
       
Segment Reporting Information [Line Items]        
Income (loss) from operations (767) 17,833 (9,833) 40,745
Germany [Member]
       
Segment Reporting Information [Line Items]        
Income (loss) from operations 1,299 (56) 1,947 287
Other EMEA [Member]
       
Segment Reporting Information [Line Items]        
Income (loss) from operations 643 1,601 5,168 3,602
Asia Pacific [Member]
       
Segment Reporting Information [Line Items]        
Income (loss) from operations $ 7,136 $ 9,309 $ 25,658 $ 19,102