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Segment Reporting (Schedule Of Financial Information Concerning Reportable Segments) (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
segment
Jun. 30, 2016
USD ($)
Segment Reporting Information [Line Items]        
Number of reportable segments | segment     2  
Total net sales $ 116,314 $ 115,365 $ 221,053 $ 210,941
Total operating loss (3,459) (22,614) (14,886) (50,033)
Other expense (income), net 1,186 (1,198) 4,253 (960)
Interest expense 7,902 6,436 15,448 12,896
Interest income (139) 0 (262) (12)
Loss from continuing operations before provision for income taxes (12,408) (27,852) (34,325) (61,957)
Industrial Materials        
Segment Reporting Information [Line Items]        
Total net sales 116,314 115,365 221,053 210,941
Total operating loss 2,308 (16,291) (4,090) (36,538)
Corporate, R&D and Other        
Segment Reporting Information [Line Items]        
Total operating loss $ (5,767) $ (6,323) $ (10,796) $ (13,495)