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STOCK-BASED COMPENSATION Fair Value Assumptions (Details) (USD $)
In Millions, unless otherwise specified
1 Months Ended 12 Months Ended
Dec. 31, 2010
Dec. 31, 2012
Dec. 31, 2011
Assumptions used in fair value valuation      
Allocated Share-based Compensation Expense $ 0.3 $ 8.3 $ 4.6
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized   $ 6.5  
Unrecognized Share Based Compensation, Weighted Average Remaining Period   2.2  
TSR Units
     
Share-based Compensation Arrangement by Share-based Payment Award      
Historical volatility rate period   3 years  
Assumptions used in fair value valuation      
Risk Free Interest Rate: 0.72%   1.18%
Expected Stock Price Volatility: 50.40%   49.20%
Expected Service Period: 3 years 3 years 2 years 8 months
Expected Dividend Yield (assuming full reinvestment): 0.00% 0.00% 0.00%
Minimum | TSR Units
     
Assumptions used in fair value valuation      
Risk Free Interest Rate:   0.38%  
Expected Stock Price Volatility:   36.41%  
Maximum | TSR Units
     
Assumptions used in fair value valuation      
Risk Free Interest Rate:   0.40%  
Expected Stock Price Volatility:   48.05%