Annual report pursuant to Section 13 and 15(d)

STOCK-BASED COMPENSATION (Details 2)

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STOCK-BASED COMPENSATION (Details 2)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
STOCK-BASED COMPENSATION      
Number of shares of common stock authorized 17,470,710    
Strike price as a percentage of fair value of common stock 100.00%    
Employee Stock Option Plans
     
STOCK-BASED COMPENSATION      
Number of shares of common stock authorized 16,802,963    
Expiration period 10 years    
Additional shares authorized for grant 600,000 4,350,000 1,600,000
Options exercised during the period (in shares) 254,149 114,988 86,459
2011 Plan | Employee Stock Option Plans
     
STOCK-BASED COMPENSATION      
Number of shares of common stock authorized 4,090,106 3,500,000  
Reduction in number of shares available for issuance subject to stock option or stock appreciation right 1 1  
Strike price as a percentage of fair value of common stock 100.00% 100.00%  
Reduction in number of shares available for issuance subject to any other type of award other than stock option or stock appreciation right 1.4 1.7  
Additional shares authorized for grant 600,000    
Options exercised during the period (in shares) 9,894    
2011 Plan | Employee Stock Option Plans | Minimum
     
STOCK-BASED COMPENSATION      
Vesting period   0 years  
2011 Plan | Employee Stock Option Plans | Maximum
     
STOCK-BASED COMPENSATION      
Expiration period   10 years  
Vesting period   5 years  
2000 Plan | Employee Stock Option Plans
     
STOCK-BASED COMPENSATION      
Number of shares of common stock authorized 11,624,675 13,610,403  
Reduction in number of shares available for issuance subject to stock option or stock appreciation right 1 1  
Strike price as a percentage of fair value of common stock 100.00% 100.00%  
Reduction in number of shares available for issuance subject to any other type of award other than stock option or stock appreciation right 1.4 1.7  
Additional shares authorized for grant   600,000  
Options exercised during the period (in shares) 200,226    
2000 Plan | Employee Stock Option Plans | Minimum
     
STOCK-BASED COMPENSATION      
Vesting period   0 years  
2000 Plan | Employee Stock Option Plans | Maximum
     
STOCK-BASED COMPENSATION      
Expiration period   10 years  
Vesting period   5 years  
2000 Plan | Performance shares
     
STOCK-BASED COMPENSATION      
Number of shares of common stock authorized 1,500,000 166,666  
Directors' Plan | Employee Stock Option Plans
     
STOCK-BASED COMPENSATION      
Number of shares of common stock authorized 1,088,182 1,135,000  
Additional shares authorized for grant   250,000  
Options exercised during the period (in shares) 44,029    
Directors' Plan | Employee Stock Option Plans | Maximum
     
STOCK-BASED COMPENSATION      
Expiration period   10 years