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Segment Reporting (Tables)
 6 Months Ended
Jun. 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 June 30,
 
For the Six Months
Ended June 30,
 
2016
 
2017
 
2016
 
2017
 
(Dollars in thousands)
Net sales to external customers:
 
 
 
 
 
 
 
Industrial Materials
$
115,365

 
$
116,314

 
$
210,941

 
$
221,053

 
 
 
 
 
 
 
 
Operating (loss) income:
 
 
 
 
 
 
 
Industrial Materials
(16,291
)
 
2,308

 
(36,538
)
 
(4,090
)
Corporate, R&D and Other expenses
(6,323
)
 
(5,767
)
 
(13,495
)
 
(10,796
)
Total operating loss
$
(22,614
)
 
$
(3,459
)
 
$
(50,033
)
 
$
(14,886
)
 
 
 
 
 
 
 
 
Reconciliation of segment operating loss to
    loss before provision for income taxes
 
 
 
 
 
 
 
Other expense (income), net
$
(1,198
)
 
$
1,186

 
$
(960
)
 
$
4,253

Interest expense
6,436

 
7,902

 
12,896

 
15,448

Interest income
—

 
(139
)
 
(12
)
 
(262
)
Loss from continuing operations before
   provision for income taxes
$
(27,852
)
 
$
(12,408
)
 
$
(61,957
)
 
$
(34,325
)