Annual report pursuant to Section 13 and 15(d)

STOCK-BASED COMPENSATION (Details)

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STOCK-BASED COMPENSATION (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
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 $ 6    $ 69
Employee Stock Option [Member]
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period 5 years    
Expiration term 10 years    
Shares issued to employees, post-split 1,000 32,000  
Exercised (in shares)   (32,000) (103,000)
Options activity outstanding of stock option plan      
Balance outstanding at the beginning of the period (in shares) 1,000 33,000 136,000
Exercised (in shares)   (32,000) (103,000)
Exercisable (in shares) 1,000    
Balance outstanding at the end of the period (in shares)    1,000 33,000
Weighted-Average Exercise Price      
Balance at the beginning of the period (in dollars per share) $ 5.52 $ 5.26 $ 4.66
Exercised (in dollars per share) $ 5.52 $ 5.25 $ 4.48
Exercisable (in dollars per share) $ 5.52    
Balance at the end of the period (in dollars per share)    $ 5.52 $ 5.26
Weighted-Average Remaining Contractual Term      
Balance at the beginning of the period 29 days 11 months 5 days 1 year 7 months 24 days
Balance at the end of the period 29 days 11 months 5 days 1 year 7 months 24 days
Aggregate Intrinsic Value      
Exercised 100 500 1,700
Proceeds received upon exercise of stock options 10 1 100
Time Lapse Restricted Shares Issued 2004 [Member]
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period 10 years    
Shares issued to employees, post-split 500,000 800,000 700,000
Vesting increment, starting with the second anniversary, over six years (as a percent) 20.00%    
Common stock reserved for issuance upon exercise of stock options (in shares) 400,000    
Stock-based compensation expense      
Pre-tax compensation expense 10,427 9,494 7,555
Tax benefit (4,014) (3,655) (2,909)
Restricted stock expense, net of tax 6,413 5,839 4,646
Unrecognized compensation cost $ 30,700 $ 30,900  
Unrecognized compensation cost, period for recognition 3 years 9 months 18 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) 2,743,000 2,686,000 2,664,000
Forfeited (in shares) (56,000) (92,000) (74,000)
Vested (in shares) (697,000) (627,000) (574,000)
Granted (in shares) 463,000 776,000 670,000
Balance outstanding at the end of the period (in shares) 2,454,000 2,743,000 2,686,000
Weighted-Average Grant-Date Fair Value      
Balance at the beginning of the period (in dollars per share) $ 16.41 $ 13.30 $ 11.09
Forfeited (in dollars per share) $ 17.52 $ 16.41 $ 12.90
Vested (in dollars per share) $ 13.34 $ 10.87 $ 10.08
Granted (in dollars per share) $ 24.49 $ 22.69 $ 19.30
Balance at the end of the period (in dollars per share) $ 18.75 $ 16.41 $ 13.30