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 6 Months Ended 12 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Y
Jun. 30, 2011
Dec. 31, 2011
Y
Options activity outstanding of stock option plan          
Exercised (in shares) (13,000) (43,000) (26,000) (53,000)  
Aggregate Intrinsic Value          
Cash receipts from options exercised       $ 11,000  
Tax benefits from share-based payments 300,000 68,000 2,900,000 138,000  
Time lapse restricted shares (TLRS's)
          
Employee stock incentive plans          
Pre-tax compensation expense 2,377,000 1,882,000 4,749,000 3,764,000  
Tax benefit (915,000) (725,000) (1,828,000) (1,449,000)  
Restricted stock expense, net of tax 1,462,000 1,157,000 2,921,000 2,315,000  
Weighted-Average Grant-Date Fair Value          
Unrecognized compensation cost 36,700,000   36,700,000   24,400,000
Unrecognized compensation cost, period for recognition (in years)     4.1   4.1
Restricted Stock Units
          
Unvested restricted stock activity          
Balance outstanding at the beginning of the period (in shares)     2,686,000    
Forfeited (in shares)     (31,000)    
Vested (in shares)     (627,000)    
Granted (in shares)     776,000    
Balance outstanding at the end of the period (in shares) 2,803,000   2,803,000    
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   $ 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) $ 16.38   $ 16.38    
Stock options
          
Employee stock incentive plans          
Award vesting period (in years)         5 years
Award expiration period (in years)         P10Y
Options activity outstanding of stock option plan          
Balance outstanding at the beginning of the period (in shares)     33,000    
Exercised (in shares)     (26,000)    
Balance outstanding at the end of the period (in shares) 7,000   7,000   33,000
Exercisable (in shares) 7,000   7,000    
Weighted-Average Exercise Price          
Balance at the beginning of the period (in dollars per share)     $ 5.26    
Exercised (in dollars per share) $ 5.19   $ 5.19    
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 (in years)          
Balance at the beginning of the period (in years)     0.93    
Balance at the end of the period (in years) 0.58   0.58   0.93
Exercisable (in years)     0.58    
Aggregate Intrinsic Value          
Balance at the beginning of the period     553,000    
Exercised     400,000 200,000  
Balance at the end of the period 119,000   119,000   553,000
Exercisable 119,000   119,000    
Cash receipts from options exercised $ 1,000 $ 11,000