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Other Income and Expense (Tables)
 12 Months Ended
Dec. 31, 2015
Other Income and Expenses [Abstract]  
Components of Other Income (Expense)
Items included in other income in the Consolidated Statements of Operations are as follows:
Year ended December 31,
(dollars in thousands)
 
2015
 
2014
 
2013
Gain (loss) on currency translation
 
$
2,641

 
$
1,905

 
$
(293
)
Hedge ineffectiveness
 
218

 
(1,247
)
 
(916
)
Insurance recovery on furnace malfunction, net (see note 18)
 
—

 
—

 
1,844

Other non-operating income
 
21

 
1,693

 
1,012

Other income
 
$
2,880

 
$
2,351

 
$
1,647