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Segment Reporting (Schedule Of Financial Information Concerning Reportable Segments) (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
segment
Sep. 30, 2016
USD ($)
Segment Reporting Information [Line Items]        
Number of reportable segments | segment     2  
Total net sales $ 137,245 $ 111,590 $ 358,298 $ 322,530
Total operating loss 1,901 (19,651) (12,985) (69,684)
Other expense (income), net (643) (567) 3,610 (1,528)
Interest expense 7,792 6,964 23,240 19,860
Interest income (58) (158) (320) (169)
Loss from continuing operations before provision for income taxes (5,190) (25,890) (39,515) (87,847)
Industrial Materials        
Segment Reporting Information [Line Items]        
Total net sales 137,245 111,590 358,298 322,530
Total operating loss 8,308 (14,238) 4,218 (50,776)
Corporate, R&D and Other        
Segment Reporting Information [Line Items]        
Total operating loss $ (6,407) $ (5,413) $ (17,203) $ (18,908)