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Segment Reporting (Tables)
 9 Months Ended
Sep. 30, 2017
Segment Reporting Information, Revenue for Reportable Segment [Abstract]  
Schedule Of Financial Information Concerning Reportable Segments
Information concerning our reportable segment is as follows:
 
For the Three Months Ended September 30,
 
For the Nine Months
Ended September 30,
 
2016
 
2017
 
2016
 
2017
 
(Dollars in thousands)
Net sales to external customers:
 
 
 
 
 
 
 
Industrial Materials
$
111,590

 
$
137,245

 
$
322,530

 
$
358,298

 
 
 
 
 
 
 
 
Operating (loss) income:
 
 
 
 
 
 
 
Industrial Materials
(14,238
)
 
8,308

 
(50,776
)
 
4,218

Corporate, R&D and Other expenses
(5,413
)
 
(6,407
)
 
(18,908
)
 
(17,203
)
Total operating (loss) income
$
(19,651
)
 
$
1,901

 
$
(69,684
)
 
$
(12,985
)
 
 
 
 
 
 
 
 
Reconciliation of segment operating loss to
    loss before provision for income taxes
 
 
 
 
 
 
 
Other expense (income), net
$
(567
)
 
$
(643
)
 
$
(1,528
)
 
$
3,610

Interest expense
6,964

 
7,792

 
19,860

 
23,240

Interest income
(158
)
 
(58
)
 
(169
)
 
(320
)
Loss from continuing operations before
   provision for income taxes
$
(25,890
)
 
$
(5,190
)
 
$
(87,847
)
 
$
(39,515
)