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INVENTORIES
6 Months Ended
Jun. 30, 2020
Inventory Disclosure [Abstract]  
Inventory Disclosure [Text Block] INVENTORIES
 
Inventories consisted of the following (amounts in thousands):
 
June 30,
2020
 
December 31,
2019
Raw material
$
68,894

 
$
83,569

Work-in-process
42,243

 
48,369

Finished goods
183,400

 
201,418

 
$
294,537

 
$
333,356


 
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.