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INVENTORIES (Details) - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
INVENTORIES [Abstract]      
Excess of current costs over carrying value of inventories $ 19,394,000 $ 18,956,000  
Positive (negative) effect of LIFO valuation method as compared to the FIFO method $ (438,000) $ (219,000) $ 259,000