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STOCK-BASED COMPENSATION (Details)
3 Months Ended9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Stock based compensation    
Anti-dilutive common shares subject to equity-based awards excluded from the computation of diluted earnings per share (in shares)923,3081,390,802492,1661,390,172
Stock options
    
Stock based compensation    
Shares of common stock issued from treasury upon exercise of employee stock options (in shares)  384,53497,612
Stock options granted (in shares)  45,7031,600
Restricted shares
    
Stock based compensation    
Shares of common stock issued from treasury for dividends earned on the vesting of restricted shares (in shares)  2,138392
Restricted shares granted (in shares)   9,944
Restricted Stock Units
    
Stock based compensation    
Restricted shares granted (in shares)  66,604