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INVENTORIES (Tables)
3 Months Ended
Mar. 31, 2018
Inventory Disclosure [Abstract]  
Schedule of Inventories

Inventories consist of the following:

 

   March 31, 2018   December 31, 2017 
Inventory at FIFO          
Finished products  $12,404   $22,558 
Materials and work in process   61,358    65,034 
Gross inventories   73,762    87,592 
Less:  LIFO reserve   (45,312)   (45,180)
Less:  excess and obsolescence reserve   (2,338)   (2,698)
Net inventories  $26,112   $39,714