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Inventories (Tables)
 12 Months Ended
Dec. 31, 2016
Inventories [Abstract]  
Schedule of Inventory, Current [Table Text Block]
INVENTORIES
December 31,
2016
 
2015
(Dollars in thousands)
 
 
 
Raw materials
$
40,255

 
$
19,148

Work in process
21,447

 
21,063

Finished goods
21,135

 
21,558

Inventories
$
82,837

 
$
61,769