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Restructuring Charges (Tables)
 12 Months Ended
Dec. 31, 2018
Restructuring and Related Activities [Abstract]  
Roll Forward of Accrued Restructuring Expense
A roll-forward of the remaining accrued restructuring expense is as follows:
(Dollars in thousands)
Severance expenses
 
Write-downs and retirements of fixed assets
 
Lease cancellations
 
Total
Accrued at January 1, 2018
$
—

 
$
—

 
$
23

 
$
23

Restructuring charges
366

 
48

 
157

 
571

Payments
(344
)
 
—

 
(172
)
 
(516
)
Non-cash settlement
—

 
(48
)
 
—

 
(48
)
Accrued at December 31, 2018
$
22

 
$
—

 
$
8

 
$
30