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INVENTORIES (Tables)
6 Months Ended
Jun. 30, 2018
Inventory Disclosure [Abstract]  
Schedule of Inventories

Inventories consist of the following:

 

   June 30, 2018   December 31, 2017 
Inventory at FIFO          
Finished products  $11,415   $22,558 
Materials and work in process   59,689    65,034 
Gross inventories   71,104    87,592 
Less:  LIFO reserve   (45,097)   (45,180)
Less:  excess and obsolescence reserve   (1,994)   (2,698)
Net inventories  $24,013   $39,714