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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) (USD $)
6 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Jun. 30, 2012
Dec. 31, 2011
Cash and Cash Equivalents        
Cash and cash equivalents $ 33,668,000 $ 16,412,000 $ 19,964,000 $ 24,449,000
Cash 1,500,000 4,100,000    
Cash equivalents 32,200,000 12,300,000    
Revenue Recognition        
Nonrefundable revenue recognized $ 0