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STOCK-BASED COMPENSATION (Details 4) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended 1 Months Ended 12 Months Ended
Dec. 31, 2012
RSUs
Dec. 31, 2011
RSUs
Dec. 31, 2012
Restricted stock
Feb. 28, 2013
Restricted stock
Chairman and CEO
Dec. 31, 2011
Restricted stock
Chairman and CEO
Dec. 31, 2010
Restricted stock
Chairman and CEO
Dec. 31, 2009
Restricted stock
Chairman and CEO
Dec. 31, 2012
Stock options
Chairman and CEO
Dec. 31, 2011
Stock options
Chairman and CEO
Dec. 31, 2009
Stock options
Chairman and CEO
Nonvested RSUs and Restricted Stock, Number of Shares                    
Nonvested at the beginning of the period (in shares) 933,051   299,642              
Granted (in shares) 364,868   0   24,642 150,000 350,000      
Vested (in shares) (424,530)   (112,141) (100,000)            
Forfeited (in shares) (116,278)                  
Nonvested at the end of the period (in shares) 757,111 933,051 187,501              
Nonvested RSUs and Restricted Stock, Weighted Average Grant Date Fair Value                    
Nonvested at the beginning of the period (in dollars per share) $ 6.48   $ 6.70              
Granted (in dollars per share) $ 12.56 $ 6.17     $ 5.55 $ 8.27 $ 5.42      
Vested (in dollars per share) $ 7.07   $ 5.45              
Forfeited (in dollars per share) $ 6.75                  
Nonvested at the end of the period (in dollars per share) $ 9.09 $ 6.48 $ 7.44              
Fair value of awards vested $ 4.3 $ 1.9                
Awards forfeited (in shares)                   589,850
Incremental non-cash compensation expense             0.7      
Vesting period             4 years 3 years 3 years  
Total fair value of awards granted         $ 0.1 $ 1.2