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SHARE-BASED AWARDS AND OPTIONS - Stock Options Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense $ 9,617 $ 8,688 $ 30,771 $ 26,060
Employee stock option        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Fair market value (as a percentage) 100.00%   100.00%  
Stock option term     10 years  
Granted (in shares)     124,000  
Share-based compensation expense $ 700 $ 500 $ 2,000 1,200
Aggregate intrinsic value of stock options exercised     9,900 $ 10,600
Total unrecognized compensation cost $ 4,000   $ 4,000  
Total unrecognized compensation cost, weighted average period     2 years 18 days  
Weighted average grant date fair value for each option granted (in USD per share) $ 23.68   $ 23.68  
Granted Before Fiscal 2015 | Employee stock option        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period     4 years  
Granted Before Fiscal 2015 | Employee stock option | Performance period. year one        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Percentage of award vesting rights     25.00%  
Granted Before Fiscal 2015 | Employee stock option | Performance period, year two        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Percentage of award vesting rights     25.00%  
Granted Before Fiscal 2015 | Employee stock option | Performance period, year three        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Percentage of award vesting rights     25.00%  
Granted Before Fiscal 2015 | Employee stock option | Performance period, year four        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Percentage of award vesting rights     25.00%  
Granted Fiscal 2015 | Employee stock option        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period     3 years  
Granted Fiscal 2015 | Employee stock option | Performance period. year one        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Percentage of award vesting rights     33.00%  
Granted Fiscal 2015 | Employee stock option | Performance period, year two        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Percentage of award vesting rights     33.00%  
Granted Fiscal 2015 | Employee stock option | Performance period, year three        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Percentage of award vesting rights     33.00%  
Granted Fiscal 2017 | Employee stock option        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Granted (in shares)     123,958  
Granted Fiscal 2016 | Employee stock option        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Granted (in shares)       72,733