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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)

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