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INVENTORIES
6 Months Ended
Jun. 30, 2017
Inventory Disclosure [Abstract]  
Inventory Disclosure [Text Block] INVENTORIES
 
Inventories consisted of the following as of the dates set forth below (amounts in thousands):
 
June 30,
2017
 
December 31,
2016
Raw material
$
85,667

 
$
76,380

Work-in-process
41,342

 
32,395

Finished goods
196,482

 
163,461

 
$
323,491

 
$
272,236


 
Inventories are valued at the lower of cost or net realizable value. Net realizable value is estimated based on current selling prices. Inventory costs are calculated using the first-in, first-out (FIFO) method or average cost method. Estimated provisions are established for slow-moving and obsolete inventory.