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STOCK-BASED COMPENSATION PLANS Narrative (Details)
shares in Thousands, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 11, 2017
USD ($)
installment
shares
Sep. 30, 2017
USD ($)
plan
shares
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
plan
shares
Sep. 30, 2016
USD ($)
Dec. 31, 2016
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of stock-based employee compensation plans | plan   2   2    
Non-cash stock-based compensation expense   $ 3,300 $ 4,200 $ 6,000 $ 7,200  
Unrecognized compensation cost   $ 19,100   $ 19,100    
Weighted average period over which compensation cost is expected to be recognized       1 year 9 months 6 days    
Severance Costs     4,500      
Accelerated compensation cost     $ 2,300      
Employee stock options            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Award vesting percentage       25.00%    
Vesting period       4 years    
Volatility rate, minimum       38.20%    
Volatility rate, maximum       40.80%    
Risk free interest rate, minimum       1.77%    
Risk free interest rate, maximum       2.10%    
Employee stock options | Minimum [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Dividend yield rate       0.00%    
Expected term       6 years    
Time-based restricted stock awards            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Restricted stock awards outstanding (in shares) | shares   1,137   1,137   312
Vesting period       3 years    
Market-based restricted stock awards            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Restricted stock awards outstanding (in shares) | shares   387   387   166
Vesting period       3 years    
Volatility rate       34.60%    
Risk free interest rate       1.46%    
Market-based restricted stock awards | Minimum [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Award vesting percentage       0.00%    
Market-based restricted stock awards | Maximum [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Award vesting percentage       200.00%    
Time-based stock options, and time-based and market-based restricted stock awards [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock-based compensation expense       $ 19,000    
2015 Stock Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of shares authorized for issuance (in shares) | shares   11,500   11,500    
Number of shares available for grant (in shares) | shares   4,200   4,200    
Chief Executive Officer [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Non-cash stock-based compensation expense       $ 1,800    
Chief Executive Officer [Member] | Restricted Stock [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Make-whole restricted stock awards $ 600          
Make-whole restricted stock awards, vested in period (in shares) | shares 67          
Share-based Compensation Award, Tranche One [Member] | Chief Executive Officer [Member] | Restricted Stock [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Make-whole restricted stock awards $ 950          
Restricted stock awards outstanding (in shares) | shares 106          
Share-based Compensation Award, Tranche Two [Member] | Chief Executive Officer [Member] | Restricted Stock [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Make-whole restricted stock awards $ 1,200          
Restricted stock awards outstanding (in shares) | shares 134          
Award vesting installment number | installment 3          
Share-based Compensation Award, Tranche Three [Member] | Chief Executive Officer [Member] | Restricted Stock [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Make-whole restricted stock awards $ 1,900          
Restricted stock awards outstanding (in shares) | shares 212          
Award vesting installment number | installment 3          
Share-based Compensation Award, Tranche Three [Member] | Chief Executive Officer [Member] | Employee stock options            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Make-whole restricted stock awards       1,900    
Stock options, nonvested outstanding (in shares) | shares 519          
Selling, General and Administrative Expenses [Member] | Chief Executive Officer [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Non-cash stock-based compensation expense       $ 2,800