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Other Operating Expenses, Net Other Operating Expenses (Income) (Tables)
 12 Months Ended
Dec. 31, 2014
Other Income and Expenses [Abstract]  
Components of other operating (income) expenses
Other operating expenses, net consisted of the following:
 
(Dollars in thousands)
 
Year Ended December 31,
 
2014
 
2013
 
2012
Impairment loss
$
3,046

 
$
—

 
$
—

Environmental remediation expense
340

 
—

 
—

Loss on sub-lease transaction
—

 
2,928

 
—

Employment tax matter
—

 
(400
)
 
—

Total other operating expenses, net
$
3,386

 
$
2,528

 
$
—