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Segment Information (Schedule Of Revenue From Unaffiliated Customers By Product) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Segment Reporting Information [Line Items]        
Revenue $ 151,574 $ 166,944 $ 482,800 $ 466,214
Products [Member]        
Segment Reporting Information [Line Items]        
Revenue 52,899 72,917 183,790 195,618
Materials [Member]        
Segment Reporting Information [Line Items]        
Revenue 34,848 39,009 108,356 117,486
Services [Member]        
Segment Reporting Information [Line Items]        
Revenue $ 63,827 $ 55,018 $ 190,654 $ 153,110