Annual report pursuant to Section 13 and 15(d)

STOCK-BASED COMPENSATION (Details)

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STOCK-BASED COMPENSATION (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Employee stock incentive plans        
Award vesting period 6 years      
Common stock reserved for issuance upon exercise of stock options (in shares) 4,500,000      
Aggregate Intrinsic Value        
Proceeds received upon exercise of stock options   $ 69,000 $ 255,000  
Time lapse restricted shares (TLRS's)
        
Employee stock incentive plans        
Award vesting period 10 years      
Shares issued to employees, post-split 800,000 700,000 900,000  
Vesting increment, starting with the second anniversary, over six years (as a percent) 20.00%      
Stock-based compensation expense        
Pre-tax compensation expense 9,494,000 7,555,000 7,538,000  
Tax benefit (3,655,000) (2,909,000) (2,902,000)  
Restricted stock expense, net of tax 5,839,000 4,646,000 4,636,000  
Unrecognized compensation cost 30,900,000 24,400,000    
Unrecognized compensation cost, period for recognition 4 years 1 month 6 days 4 years 1 month 6 days 4 years 1 month 6 days  
Unvested restricted stock activity        
Balance outstanding at the beginning of the period (in shares) 2,686,000 2,664,000 2,736,000  
Forfeited (in shares) (92,000) (74,000) (277,000)  
Vested (in shares) (627,000) (574,000) (666,000)  
Granted (in shares) 776,000 670,000 871,000  
Balance outstanding at the end of the period (in shares) 2,743,000 2,686,000 2,664,000  
Weighted-Average Grant-Date Fair Value        
Balance at the beginning of the period (in dollars per share) $ 13.30 $ 11.09 $ 10.31  
Forfeited (in dollars per share) $ 16.41 $ 12.90 $ 10.99  
Vested (in dollars per share) $ 10.87 $ 10.08 $ 9.51  
Granted (in dollars per share) $ 22.69 $ 19.30 $ 12.32  
Balance at the end of the period (in dollars per share) $ 16.41 $ 13.30 $ 11.09  
Time Lapse Restricted Shares, Issued 2004 and later
        
Employee stock incentive plans        
Award vesting period 6 years      
Vesting increment, starting with the second anniversary, over six years (as a percent) 20.00%      
Stock options
        
Employee stock incentive plans        
Award vesting period 5 years      
Expiration term 10 years      
Shares issued to employees, post-split 32,000 100,000    
Exercised (in shares) (32,000) (103,000) (517,000)  
Options activity outstanding of stock option plan        
Balance outstanding at the beginning of the period (in shares) 33,000 136,000 653,000  
Exercised (in shares) (32,000) (103,000) (517,000)  
Exercisable (in shares) 1,000      
Balance outstanding at the end of the period (in shares) 1,000 33,000 136,000 653,000
Weighted-Average Exercise Price        
Balance at the beginning of the period (in dollars per share) $ 5.26 $ 4.66 $ 4.67  
Exercised (in dollars per share) $ 5.25 $ 4.48 $ 4.67  
Exercisable (in dollars per share) $ 5.52      
Balance at the end of the period (in dollars per share) $ 5.52 $ 5.26 $ 4.66 $ 4.67
Weighted-Average Remaining Contractual Term        
Balance at the beginning of the period 29 days 11 months 5 days 1 year 7 months 2 days 2 years 5 months 8 days
Balance at the end of the period 29 days 11 months 5 days 1 year 7 months 2 days 2 years 5 months 8 days
Exercisable 29 days      
Aggregate Intrinsic Value        
Balance at the beginning of the period 553,000 2,056,000 5,348,000  
Exercised 500,000 1,700,000 5,200,000  
Balance at the end of the period 17,000 553,000 2,056,000 5,348,000
Exercisable 17,000      
Proceeds received upon exercise of stock options $ 1,000 $ 100,000 $ 300,000