Annual report pursuant to Section 13 and 15(d)

STOCK-BASED COMPENSATION (Details)

v3.6.0.2
STOCK-BASED COMPENSATION (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares issued to employees     72,760,969 72,932,222
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 0 0    
Time Lapse Restricted Shares Issued 2004 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period 6 years      
Shares issued to employees 500,000 700,000 600,000  
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) 4,700,000      
Stock-based compensation expense        
Pre-tax compensation expense $ 12,415 $ 12,110 $ 10,579  
Tax benefit (4,805) (4,687) (4,094)  
Restricted stock expense, net of tax 7,610 7,423 $ 6,485  
Unrecognized compensation cost $ 29,900 $ 31,300    
Unrecognized compensation cost, period for recognition 3 years 9 months 18 days 3 years 9 months 18 days    
Unvested restricted stock activity        
Balance outstanding at the beginning of the period (in shares) 2,751,000 3,100,000 3,680,000  
Forfeited (in shares) (114,000) (85,000) (178,000)  
Vested (in shares) (879,000) (946,000) (1,018,000)  
Granted (in shares) 503,000 682,000 616,000  
Balance outstanding at the end of the period (in shares) 2,261,000 2,751,000 3,100,000 3,680,000
Weighted-Average Grant-Date Fair Value        
Balance at the beginning of the period (in dollars per share) $ 17.21 $ 14.45 $ 12.50  
Forfeited (in dollars per share) 19.54 15.71 14.27  
Vested (in dollars per share) 14.49 12.04 10.31  
Granted (in dollars per share) 26.45 22.43 19.16  
Balance at the end of the period (in dollars per share) $ 20.21 $ 17.21 $ 14.45 $ 12.50