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STOCK PLANS (Details 5) (USD $)
12 Months Ended
Dec. 31, 2011
Y
Dec. 31, 2010
Dec. 31, 2009
Stock-based Compensation      
Stock-based compensation, pre-tax $ 9,700,000 $ 9,200,000 $ 8,200,000
Stock-based compensation, after-tax 5,900,000 5,600,000 5,000,000
Stock-based compensation, per diluted share (in dollars per share) $ 0.12 $ 0.12 $ 0.11
Compensation cost related to nonvested awards not yet recognized 16,800,000 10,900,000  
Weighted average remaining period over which cost to be recognized (in years) 1.5    
Low end of range
     
Stock-based Compensation      
Employee contribution as a percentage of eligible gross pay 1.00%    
High end of range
     
Stock-based Compensation      
Employee contribution as a percentage of eligible gross pay 10.00%    
Employee Stock Purchase Plan
     
Stock-based Compensation      
Discount rate as a percentage of the high and low sale price per share on last trading day 5.00%    
Maximum annual employee contribution to Employee Stock Purchase Plan 25,000    
Shares purchased by employee 2,567 3,251 6,716
Stock options
     
Stock-based Compensation      
Compensation cost related to nonvested awards not yet recognized 600,000 1,600,000  
Restricted stock
     
Stock-based Compensation      
Compensation cost related to nonvested awards not yet recognized $ 16,200,000 $ 9,300,000