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Inventories (Tables)
12 Months Ended
Dec. 31, 2015
Inventory Disclosure [Abstract]  
Components of inventories
 
(Dollars in thousands)
 
December 31,
 
2015
 
2014
Inventories, gross
$
49,615

 
$
50,063

Reserve for obsolete and excess inventory
(5,520
)
 
(5,546
)
Inventories, net
$
44,095

 
$
44,517