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LINE OF CREDIT (Details) (Credit facility, USD $)
In Millions, unless otherwise specified
6 Months Ended 12 Months Ended
Jun. 30, 2012
Dec. 31, 2011
Credit facility
   
Line of Credit Facility [Line Items]    
Credit facility with a bank   $ 25
Description of interest rate of credit facility   LIBOR
Line of credit interest rate (in percent) 1.01%  
Line of credit basis points 2.00%  
Line of credit unused portion per year (in percent) 0.375%