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Restructuring and Impairment Charges (Tables)
 9 Months Ended
Sep. 30, 2017
Restructuring and Related Activities [Abstract]  
Restructuring and Related Costs
Severance activity related to the headquarters relocation is presented in the table below for the nine months ended September 30, 2017:
(Dollars in thousands)
Severance Related to Headquarters Relocation
Balance at December 31, 2016
$
470

Provisions
361

Payments
(649
)
Balance at September 30, 2017
$
182