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INVENTORIES
6 Months Ended
Jun. 30, 2021
Inventory Disclosure [Abstract]  
Inventory Disclosure [Text Block] INVENTORIES
Inventories consisted of the following (amounts in thousands):
 June 30,
2021
December 31,
2020
Raw material$103,197 $78,733 
Work-in-process45,186 36,485 
Finished goods196,956 178,461 
 $345,339 $293,679 
 
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.