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INVENTORIES (Tables)
 6 Months Ended
Jun. 30, 2016
Inventory Disclosure [Abstract]  
Schedule of Inventory, Current [Table Text Block]
Inventories consisted of the following (amounts in thousands):
 
June 30,
2016
 
December 31,
2015
Raw material
$
72,516

 
$
85,490

Work-in-process
31,582

 
31,866

Finished goods
171,261

 
158,997

 
275,359

 
276,353

Adjustment to LIFO
(1,615
)
 
(6,562
)
 
$
273,744

 
$
269,791