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STOCK-BASED COMPENSATION PLANS (Details) - USD ($)
1 Months Ended 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Apr. 30, 2014
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Stock Based Compensation Plans              
STOCK-BASED COMPENSATION PLANS:              
Compensation expense         $ 16,900,000 $ 18,000,000 $ 13,900,000
ESPP              
STOCK-BASED COMPENSATION PLANS:              
Number of shares reserved for award 3,200,000       3,200,000    
Compensation expense         $ 900,000 700,000 700,000
Number of shares available for future grant 995,349       995,349    
ESPP | Maximum              
STOCK-BASED COMPENSATION PLANS:              
Percentage of the fair market value of common stock as of the first day of the quarter or on last day of the quarter         85.00%    
RSAs              
STOCK-BASED COMPENSATION PLANS:              
Compensation expense         $ 2,800,000 5,300,000 3,200,000
Unrecognized compensation expense $ 1,700,000       $ 1,700,000    
Unrestricted shares granted (in shares)         96,450    
Stock Grants | Non Employee Director              
STOCK-BASED COMPENSATION PLANS:              
Compensation expense         $ 600,000 $ 600,000 $ 400,000
Unrestricted shares granted (in shares)         20,000 20,000 12,000
SARs              
STOCK-BASED COMPENSATION PLANS:              
SAR's granted (in shares)         400,000    
SAR's outstanding (in shares) 2,310,000 1,910,000     2,310,000 1,910,000  
SAR's outstanding intrinsic value $ 32,600,000       $ 32,600,000    
SAR's remaining contractual life         6 years 29 days    
SARs | LTIP | President and Chief Executive Officer              
STOCK-BASED COMPENSATION PLANS:              
Compensation expense         $ 4,000,000 $ 2,600,000 $ 2,600,000
SAR's granted (in shares)         400,000 310,000 200,000
SAR's granted $ 31.40 $ 24.93 $ 27.86   $ 31.40 $ 24.93 $ 27.86
SAR's vesting period         10 years    
Stock Options              
STOCK-BASED COMPENSATION PLANS:              
Compensation expense $ 500,000 $ 800,000 $ 1,100,000   $ 400,000 $ 800,000 $ 1,500,000
Number of options to be granted annually       125,000      
Weighted average remaining contractual life of options       10 years      
Stock Options | Maximum              
STOCK-BASED COMPENSATION PLANS:              
Aggregate intrinsic value of options       $ 20,000,000      
401 (K) Plan              
STOCK-BASED COMPENSATION PLANS:              
Maximum match as a percentage of elective deferrals by eligible employees         50.00%    
Maximum match as a percentage of employee's total cash compensation         4.00%    
Compensation expense relating to match         $ 6,900,000 6,200,000 5,200,000
Number of shares reserved for matches 3,000,000       3,000,000    
Number of shares available for future grants 410,119       410,119    
Subsidiary Stock Awards              
STOCK-BASED COMPENSATION PLANS:              
Compensation expense         $ 1,300,000 $ 1,800,000 $ 200,000
Class A Common Stock | LTIP              
STOCK-BASED COMPENSATION PLANS:              
Number of shares reserved for award 14,000,000       14,000,000    
Number of shares (including forfeited shares) available for future grants 7,111,609       7,111,609    
Award Date, 2016 | RSAs | LTIP              
STOCK-BASED COMPENSATION PLANS:              
Vesting period         2 years    
Percentage of restriction to be lapsed in year one from grant date         50.00%    
Percentage of restriction to be lapsed in year two from grant date         50.00%    
Award Date, 2015 | RSAs | LTIP              
STOCK-BASED COMPENSATION PLANS:              
Vesting period         2 years    
Percentage of restriction to be lapsed in year one from grant date         50.00%    
Percentage of restriction to be lapsed in year two from grant date         50.00%    
Award Date, 2014 | RSAs | LTIP              
STOCK-BASED COMPENSATION PLANS:              
Vesting period         2 years    
Percentage of restriction to be lapsed in year one from grant date         50.00%    
Percentage of restriction to be lapsed in year two from grant date         50.00%