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STOCK COMPENSATION PLAN - Additional Information (Details) - USD ($)
1 Months Ended 12 Months Ended
Apr. 17, 2017
Apr. 15, 2017
Jul. 31, 2014
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Apr. 15, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Stock-based compensation amortization       $ 6,800,000 $ 6,400,000 [1] $ 5,100,000 [1]  
Shares reserved for issuance (in shares)       6,565,000      
Shares remaining available for grants (in shares)       3,400,000      
Term of plan     7 years        
Share based payment award options vesting period range start       1 year      
Share based payment award options vesting period range end       4 years      
Options exercisable (in shares)       0 0 0  
Closing price (usd per share)       $ 26.00     $ 36.97
Segment reconciling items              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Compensation expense       $ 6,800,000 $ 6,400,000 $ 5,100,000  
Restricted Stock              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share based payment award period range start       2 years      
Share based payment award period range end       5 years      
Restricted stock granted (in shares)       853,111 125,540 220,635  
Fair value of restricted stock and restricted stock units vested       $ 7,000,000 $ 6,500,000    
Deferred stock-based compensation related to restricted stock awards       19,400,000      
Weighted average remaining contractual terms         3 years 3 months    
Chief Executive Officer [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vesting period   5 years          
Chief Executive Officer [Member] | Restricted Stock              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Restricted stock granted (in shares)   270,489          
Common stock equivalent value to shares granted   $ 10,000,000          
Chief Financial Officer [Member] | Restricted Stock              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Common stock equivalent value to shares granted       $ 5,000,000      
Chief Operating Officer [Member] | Restricted Stock              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Restricted stock granted (in shares) 192,307            
First Anniversary [Member] | Restricted Stock              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vesting period       2 years 3 years 4 years  
First Anniversary [Member] | Chief Operating Officer [Member] | Restricted Stock              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Award vesting percentage 20.00%            
Second Anniversary [Member] | Restricted Stock              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vesting period       5 years 4 years 5 years  
Second Anniversary [Member] | Chief Executive Officer [Member] | Restricted Stock              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Award vesting percentage   20.00%          
Second Anniversary [Member] | Chief Operating Officer [Member] | Restricted Stock              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Award vesting percentage 20.00%            
Third Anniversary [Member] | Chief Executive Officer [Member] | Restricted Stock              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Award vesting percentage   20.00%          
Third Anniversary [Member] | Chief Operating Officer [Member] | Restricted Stock              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Award vesting percentage 20.00%            
Fourth Anniversary [Member] | Chief Executive Officer [Member] | Restricted Stock              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Award vesting percentage   20.00%          
Fourth Anniversary [Member] | Chief Operating Officer [Member] | Restricted Stock              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Award vesting percentage 20.00%            
Fifth Anniversary [Member] | Chief Executive Officer [Member] | Restricted Stock              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Award vesting percentage   20.00%          
Fifth Anniversary [Member] | Chief Operating Officer [Member] | Restricted Stock              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Award vesting percentage 20.00%            
Class A Common Stock              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Award requisite service period       7 years      
[1] Adjusted as a result of the adoption of certain accounting pronouncements beginning on January 1, 2017. See Note 1, "Description of Business and Summaryof Significant Accounting Policies - Recently Adopted Accounting Pronouncements," for details of these adjustments.