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Inventories (Tables)
12 Months Ended
Dec. 31, 2018
Inventory Disclosure [Abstract]  
Components of inventories
 
(Dollars in thousands)
 
December 31,
 
2019
 
2018
Inventories, gross
$
60,500

 
$
58,215

Reserve for obsolete and excess inventory
(4,595
)
 
(5,328
)
Inventories, net
$
55,905

 
$
52,887