Inventories (Tables)
 3 Months Ended
Mar. 31, 2015
Inventory Disclosure [Abstract]  
Inventories
Inventories were as follows:
(Dollars in thousands)
March 31,
2015
 
December 31,
2014
Raw materials
$
30,672

 
$
26,787

Work-in-process
23,094

 
16,564

Finished goods
28,473

 
25,277

Total Inventory
$
82,239

 
$
68,628