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SUPPLEMENTAL CASH FLOW INFORMATION (Details) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
SUPPLEMENTAL CASH FLOW INFORMATION [Abstract]      
State and federal income taxes paid $ 9,197,000 $ 513,000 $ 4,531,000
Income tax refunds 662,000 1,824,000 2,481,000
Increase in property and equipment and lease obligations $ 7,073,000 $ 4,535,000