Quarterly report pursuant to Section 13 or 15(d)

STOCKHOLDERS' EQUITY (Details 2)

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STOCKHOLDERS' EQUITY (Details 2) (USD $)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Aggregate Intrinsic Value          
Cash receipts from options exercised       $ 19,000  
Tax benefits from share-based payments 100,000 4,400,000 3,000,000 4,500,000  
Stock options
          
Employee stock incentive plans          
Award vesting period         5 years
Award expiration period         10 years
Common stock issued upon exercise of stock options by employees (in shares) 6,000 3,000 32,000 56,000  
Options activity outstanding of stock option plan          
Balance outstanding at the beginning of the period (in shares)     33,000    
Exercised (in shares) (6,000) (3,000) (32,000) (56,000)  
Balance outstanding at the end of the period (in shares) 1,000   1,000   33,000
Exercisable (in shares) 1,000   1,000    
Weighted-Average Exercise Price          
Balance at the beginning of the period (in dollars per share)     $ 5.26    
Exercised (in dollars per share)     $ 5.25    
Balance at the end of the period (in dollars per share) $ 5.52   $ 5.52   $ 5.26
Exercisable (in dollars per share) $ 5.52   $ 5.52    
Weighted-Average Remaining Contractual Term          
Balance at the beginning of the period     3 months 29 days   11 months 5 days
Balance at the end of the period     3 months 29 days   11 months 5 days
Exercisable     3 months 29 days    
Aggregate Intrinsic Value          
Balance at the beginning of the period     553,000    
Exercised     200,000 200,000  
Balance at the end of the period 18,000   18,000   553,000
Exercisable 18,000   18,000    
Cash receipts from options exercised 1,000 19,000      
Time lapse restricted shares (TLRS's)
          
Aggregate Intrinsic Value          
Pre-tax compensation expense 2,376,000 1,882,000 7,125,000 5,645,000  
Tax benefit (915,000) (725,000) (2,743,000) (2,174,000)  
Restricted stock expense, net of tax 1,461,000 1,157,000 4,382,000 3,471,000  
Weighted-Average Grant-Date Fair Value          
Unrecognized compensation cost $ 33,600,000   $ 33,600,000   $ 24,400,000
Unrecognized compensation cost, period for recognition     4 years 2 months 12 days   4 years 1 month 6 days
Restricted Stock Units
          
Unvested restricted stock activity          
Balance outstanding at the beginning of the period (in shares)     2,686,000    
Forfeited (in shares)     (69,000)    
Vested (in shares)     (627,000)    
Granted (in shares)     776,000    
Balance outstanding at the end of the period (in shares) 2,766,000   2,766,000    
Weighted-Average Grant-Date Fair Value          
Balance at the beginning of the period (in dollars per share)     $ 13.31    
Forfeited (in dollars per share)     $ 18.21    
Vested (in dollars per share)     $ 10.87    
Granted (in dollars per share)     $ 22.69    
Balance at the end of the period (in dollars per share) $ 16.37   $ 16.37