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Segment Information (Schedule Of Revenue From Unaffiliated Customers By Product And Service) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Segment Reporting Information [Line Items]    
Revenue $ 152,555 $ 160,722
Operating Segments [Member] | Products [Member]    
Segment Reporting Information [Line Items]    
Revenue 52,495 62,715
Operating Segments [Member] | Materials [Member]    
Segment Reporting Information [Line Items]    
Revenue 38,469 37,107
Operating Segments [Member] | Services [Member]    
Segment Reporting Information [Line Items]    
Revenue $ 61,591 $ 60,900