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Inventories (Tables)
 12 Months Ended
Dec. 31, 2017
Inventory Disclosure [Abstract]  
Components of inventories
 
(Dollars in thousands)
 
December 31,
 
2018
 
2017
Inventories, gross
$
58,215

 
$
56,492

Reserve for obsolete and excess inventory
(5,328
)
 
(5,564
)
Inventories, net
$
52,887

 
$
50,928