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INVENTORIES
6 Months Ended
Jun. 30, 2018
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,
2018
 
December 31,
2017
Raw material
$
99,198

 
$
83,541

Work-in-process
45,069

 
40,525

Finished goods
228,465

 
215,770

 
$
372,732

 
$
339,836


 
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.