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INVESTMENTS (Details) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]          
Available-for-sale securities, gross realized gains $ 0 $ 0 $ 0 $ 0  
Available-for-sale securities, gross realized losses 0 0 0 0  
Debt Maturities Fair Value [Abstract]          
October 1, 2013 — September 30, 2014 0   0    
October 1, 2014 — September 30, 2018 606,000   606,000    
October 1, 2018 — September 30, 2023 0   0    
After September 30, 2023 21,069,000   21,069,000    
Fair Value $ 21,675,000   $ 21,675,000   $ 21,699,000
Minimum [Member]
          
Investments, Debt and Equity Securities [Abstract]          
Short-term investment maturities (in days)     90 days    
Available for sale short term investment contractual maturities (in years)     1 year