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INVENTORIES (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
INVENTORIES [Abstract]      
Excess of current costs over carrying value of inventories $ 18,956,000us-gaap_ExcessOfReplacementOrCurrentCostsOverStatedLIFOValue $ 18,737,000us-gaap_ExcessOfReplacementOrCurrentCostsOverStatedLIFOValue  
Positive (negative) effect of LIFO valuation method as compared to the FIFO method $ (219,000)us-gaap_InventoryLIFOReservePeriodCharge $ 259,000us-gaap_InventoryLIFOReservePeriodCharge $ (886,000)us-gaap_InventoryLIFOReservePeriodCharge