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Restructuring Charges (Tables)
 12 Months Ended
Dec. 31, 2014
Restructuring and Related Activities [Abstract]  
Roll Forward of Accrued Restructuring Expense
A roll-forward of the accrued restructuring expense is as follows:
(Dollars in thousands)
Severance
Accrued at January 1, 2013
$
—

Restructuring charge
437

Payments
(432
)
Adjustment of restructuring charge
(5
)
Accrued at December 31, 2013
$
—