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STOCK BASED COMPENSATION (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
plans
Dec. 31, 2011
Dec. 31, 2010
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]      
Number of stock based compensation plans 2    
Stock based compensation expense $ 6.1 $ 4.7 $ 3.6
Unrecognized compensation expense $ 15.1    
Weighted-average period 1 year 8 months 12 days