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STOCK-BASED COMPENSATION (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
STOCK BASED COMPENSATION        
Stock option expense $ 0.2 $ 0.2 $ 0.8 $ 0.6
Principal assumptions used in applying the Black-Scholes option pricing model for the awards        
Risk-free interest rate (as a percent) 1.12%   1.10%  
Dividend yield (as a percent) 0.00%   0.00%  
Volatility factor of the expected market price of common stock (as a percent) 72.90%   74.08%  
Weighted-average expected life of option 3 years 6 months   3 years 6 months  
Weighted-average grant date fair value (in dollars per share) $ 0.58   $ 0.56  
Certain employees and directors        
STOCK BASED COMPENSATION        
Stock options granted (in shares) 0.1 0.0 0.1 0.0
Exercise price of options granted (in dollars per share) $ 1.07   $ 1.07  
Vesting period of options 3 years   3 years  
Exercisable period of options 5 years   5 years