Annual report pursuant to Section 13 and 15(d)

STOCK-BASED COMPENSATION (Details 5)

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STOCK-BASED COMPENSATION (Details 5) (USD $)
12 Months Ended
Dec. 31, 2012
item
Dec. 31, 2011
Dec. 31, 2010
STOCK-BASED COMPENSATION      
Number of shares of common stock available for future issuance 17,470,710    
Employee Stock Purchase Plan
     
STOCK-BASED COMPENSATION      
Purchase price expressed as a percentage of fair market value of common stock on the first day of the offering period (as a percent) 85.00%    
Purchase price expressed as a percentage of fair market value of common stock on the purchase date (as a percent) 85.00%    
Number of shares of common stock issued 269,681 247,880 228,585
Average price of shares issued (in dollars per share) $ 5.81 $ 6.08 $ 6.09
Weighted average fair value of stock purchased (in dollars per share) $ 3.42 $ 2.96 $ 3.73
Number of shares of common stock available for future issuance 467,747    
Number of purchase periods per award offering period 4    
Award offering period 24 months    
Award purchase period 6 months    
Total incremental fair value for the Purchase Plan reset $ 874,000