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Restructuring and Impairment Charges (Tables)
 3 Months Ended
Mar. 31, 2014
Restructuring and Related Activities [Abstract]  
Summary of Severance Accural Activity
The following table summarizes changes in the severance accrual from December 31, 2013 through March 31, 2014:
(Dollars in thousands)
Streamlining and restructuring related activities
 
Curamik finishing operations relocation to Hungary
 
Total
Balance at December 31, 2013
$
695

 
$
—

 
$
695

Payments
(549
)
 


 
(549
)
Balance at March 31, 2014
$
146

 
$
—

 
$
146