Annual report pursuant to Section 13 and 15(d)

EMPLOYEE BENEFIT AND STOCK COMPENSATION PLANS (Details 5)

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EMPLOYEE BENEFIT AND STOCK COMPENSATION PLANS (Details 5) (USD $)
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Employee stock incentive plans      
Stock split conversion terms   three-for-two, with fractional shares settled in cash  
Award vesting period (in years) 6 years    
Common stock reserved for issuance under stock compensation plans (in shares) 5,200,000    
Aggregate Intrinsic Value      
Proceeds received upon exercise of stock options $ 69,000 $ 255,000 $ 493,000
Time lapse restricted shares (TLRS's)
      
Employee stock incentive plans      
Award vesting period (in years) 6 years    
Vesting increment, starting with the second anniversary, over six years (as a percent) 20.00%    
Shares issued to employees, post-split 700,000 900,000 700,000
Stock-based compensation expense      
Pre-tax compensation expense 7,555,000 7,538,000 5,800,000
Tax benefit (2,909,000) (2,902,000) (2,233,000)
Restricted stock expense, net of tax 4,646,000 4,636,000 3,567,000
Unrecognized compensation cost 24,400,000    
Unrecognized compensation cost, period for recognition (in years) 4.1    
Unvested restricted stock activity      
Balance outstanding at the beginning of the period (in shares) 2,664,000 2,737,000 2,453,000
Forfeited (in shares) (74,000) (277,000) (26,000)
Vested (in shares) (574,000) (666,000) (412,000)
Granted (in shares) 670,000 871,000 721,000
Balance outstanding at the end of the period (in shares) 2,686,000 2,664,000 2,737,000
Weighted-Average Grant-Date Fair Value      
Balance at the beginning of the period (in dollars per share) $ 11.09 $ 10.31 $ 9.80
Forfeited (in dollars per share) $ 12.90 $ 10.99 $ 9.48
Vested (in dollars per share) $ 10.08 $ 9.51 $ 8.51
Granted (in dollars per share) $ 19.30 $ 12.32 $ 10.99
Balance at the end of the period (in dollars per share) $ 13.31 $ 11.09 $ 10.31
Time Lapse Restricted Shares, Issued 2004 and later
      
Employee stock incentive plans      
Vesting increment, starting with the second anniversary, over six years (as a percent) 20.00%    
Stock options
      
Employee stock incentive plans      
Award vesting period (in years) 5 years    
Expiration term (in years) P10Y    
Employee Stock Buybacks and Common Stock Options Exercised (in shares) 103,000 517,000 328,000
Shares issued to employees, post-split 100,000 500,000  
Option activity under stock option plan      
Balance outstanding at the beginning of the period (in shares) 136,000 653,000 986,000
Exercised (in shares) (103,000) (517,000) (328,000)
Forfeited (in shares)     (5,000)
Balance outstanding at the end of the period (in shares) 33,000 136,000 653,000
Exercisable(in shares) 33,000    
Weighted-Average Exercise Price      
Balance at the beginning of the period (in dollars per share) $ 4.66 $ 4.67 $ 4.71
Exercised (in dollars per share) $ 4.48 $ 4.67 $ 4.84
Forfeited (in dollars per share)     $ 3.22
Balance at the end of the period (in dollars per share) $ 5.26 $ 4.66 $ 4.67
Exercisable (in dollars per share) $ 5.26    
Weighted-Average Remaining Contractual Term (in years)      
Balance at the beginning of the period (in years) 1.59 2.44 3.39
Balance at the end of the period (in years) 0.93 1.59 2.44
Exercisable (in years) 0.93    
Aggregate Intrinsic Value      
Balance at the beginning of the period 2,056,000 5,348,000 7,236,000
Balance at the end of the period 553,000 2,056,000 5,348,000
Exercisable 553,000    
Exercised 1,700,000 5,200,000 2,400,000
Proceeds received upon exercise of stock options $ 100,000 $ 300,000 $ 500,000