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Restructuring and Impairment Charges (Tables)
 6 Months Ended
Jun. 30, 2018
Restructuring and Related Activities [Abstract]  
Restructuring and Related Costs
Severance activity related to the facility consolidation is presented in the table below for the six months ended June 30, 2018:
(Dollars in thousands)
Severance Related to Facility Consolidation
Balance at December 31, 2017
$
—

Provisions
316

Payments
(14
)
Balance at June 30, 2018
$
302

Severance activity related to the headquarters relocation is presented in the table below for the six months ended June 30, 2018:
(Dollars in thousands)
Severance Related to Headquarters Relocation
Balance at December 31, 2017
$
183

Provisions
99

Payments
(244
)
Balance at June 30, 2018
$
38