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STOCK-BASED COMPENSATION Fair Value Assumptions (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Assumptions used in fair value valuation      
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized $ 7.3    
Unrecognized Share Based Compensation, Weighted Average Remaining Period 2 years 5 months    
TSR Units
     
Share-based Compensation Arrangement by Share-based Payment Award      
Historical volatility rate period 3 years    
Assumptions used in fair value valuation      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate     1.18%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate     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      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate 0.37% 0.38%  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate 33.36% 36.41%  
Maximum | TSR Units
     
Assumptions used in fair value valuation      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate 0.67% 0.40%  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate 36.11% 48.05%