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, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Aggregate Intrinsic Value          
Proceeds received upon exercise of stock options     $ 6,000    
Stock options
          
Employee stock incentive plans          
Award vesting period     5 years    
Expiration term     10 years    
Common stock issued upon exercise of stock options by employees (in shares) 0 13,000 1,000 26,000  
Options activity outstanding of stock option plan          
Balance outstanding at the beginning of the period (in shares)     1,000    
Exercised (in shares) 0 (13,000) (1,000) (26,000)  
Balance outstanding at the end of the period (in shares) 0   0   1,000
Weighted-Average Exercise Price          
Balance at the beginning of the period (in dollars per share)     $ 5.52    
Exercised (in dollars per share)     $ 5.52    
Balance at the end of the period (in dollars per share)         $ 5.52
Weighted-Average Remaining Contractual Term          
Balance at the beginning of the period         3 months 29 days
Balance at the end of the period         3 months 29 days
Aggregate Intrinsic Value          
Balance at the beginning of the period     18,000    
Exercised     20,000 400,000  
Balance at the end of the period         18,000
Proceeds received upon exercise of stock options 0        
Stock options | Minimum
          
Aggregate Intrinsic Value          
Proceeds received upon exercise of stock options   1,000      
Time lapse restricted shares (TLRS's)
          
Aggregate Intrinsic Value          
Pre-tax compensation expense 2,546,000 2,377,000 5,092,000 4,749,000  
Tax benefit (980,000) (915,000) (1,960,000) (1,828,000)  
Restricted stock expense, net of tax 1,566,000 1,462,000 3,132,000 2,921,000  
Tax benefits from share-based payments 400,000 300,000 3,100,000 2,900,000  
Weighted-Average Grant-Date Fair Value          
Unrecognized compensation cost $ 36,600,000   $ 36,600,000   $ 36,700,000
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)     2,743,000    
Forfeited (in shares)     (26,000)    
Vested (in shares)     (648,000)    
Granted (in shares)     463,000    
Balance outstanding at the end of the period (in shares) 2,532,000   2,532,000    
Weighted-Average Grant-Date Fair Value          
Balance at the beginning of the period (in dollars per share)     $ 16.41    
Forfeited (in dollars per share)     $ 17.53    
Vested (in dollars per share)     $ 12.92    
Granted (in dollars per share)     $ 23.75    
Balance at the end of the period (in dollars per share) $ 18.62   $ 18.62