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STOCK-BASED COMPENSATION (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
STOCK-BASED COMPENSATION        
Stock option expense $ 0.3 $ 0.7 $ 1.0 $ 2.8
Principal assumptions used in applying the Black-Scholes option pricing model for the awards        
Risk-free interest rate (as a percent)     0.50% 0.97%
Volatility factor of the expected market price of common stock (as a percent)     66.00% 75.00%
Weighted-average expected life of option 3 years 6 months   3 years 6 months 6 years
Weighted-average grant date fair value (in dollars per share) $ 1.02   $ 1.01 $ 3.80
Minimum
        
Principal assumptions used in applying the Black-Scholes option pricing model for the awards        
Risk-free interest rate (as a percent) 0.50%      
Volatility factor of the expected market price of common stock (as a percent) 66.00%      
Maximum
        
Principal assumptions used in applying the Black-Scholes option pricing model for the awards        
Risk-free interest rate (as a percent) 0.86%      
Volatility factor of the expected market price of common stock (as a percent) 69.00%      
Certain employees and directors
        
STOCK-BASED COMPENSATION        
Stock options granted (in shares)     1.7  
Exercise price of options granted (in dollars per share)     $ 2.26  
Vesting period of options     3 years  
Exercise period of options     5 years  
Chief Operating Officer
        
STOCK-BASED COMPENSATION        
Stock options granted (in shares)       0.3
Exercise price of options granted (in dollars per share)       $ 5.80
Vesting period of options       3 years
Exercise period of options       10 years