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Other Income (Expense) (Tables)
 12 Months Ended
Dec. 31, 2014
Other Income and Expenses [Abstract]  
Components of Other Income (Expense)
Items included in other income (expense) in the Consolidated Statements of Operations are as follows:
Year ended December 31,
(dollars in thousands)
 
2014
 
2013
 
2012
Gain (loss) on currency translation
 
$
1,905

 
$
(293
)
 
$
(780
)
Hedge ineffectiveness
 
(1,247
)
 
(916
)
 
265

Insurance recovery on furnace malfunction, net (see note 18)
 
—

 
1,844

 
—

Other non-operating income (expense)
 
1,693

 
1,012

 
703

Other income (expense)
 
$
2,351

 
$
1,647

 
$
188