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STOCK-BASED COMPENSATION - Summary of Assumptions used in Total Stockholder Return-Based Stock Units Valuation (Details) - TSR Units [Member]
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Assumptions used in fair value valuation      
Expected Service Period   3 years 3 years
Expected Dividend Yield (assuming full reinvestment) 0.00% 0.00% 0.00%
Minimum [Member]      
Assumptions used in fair value valuation      
Risk Free Interest Rate 0.87% 1.07% 0.37%
Expected Stock Price Volatility 23.55% 24.14% 33.36%
Expected Service Period 2 years 6 months    
Maximum [Member]      
Assumptions used in fair value valuation      
Risk Free Interest Rate 1.31% 1.09% 0.67%
Expected Stock Price Volatility 27.02% 24.22% 36.11%
Expected Service Period 3 years