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Restructuring and Impairment Charges (Tables)
 3 Months Ended
Mar. 31, 2018
Restructuring and Related Activities [Abstract]  
Restructuring and Related Costs
Severance activity related to the headquarters relocation is presented in the table below for the three month-period ended March 31, 2018:
(Dollars in thousands)
Severance Related to Headquarters Relocation
Balance at December 31, 2017
$
183

Provisions
53

Payments
(157
)
Balance at March 31, 2018
$
79