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SHARE-BASED AWARDS AND OPTIONS - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
May 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense $ 89,634 $ 57,826 $ 39,095  
Restricted Stock Awards and Performance Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total fair value of share awards vested in period 82,100 43,400 33,700  
Share-based compensation expense 74,300 53,200 35,200  
Total unrecognized compensation cost of restricted stock and performance awards $ 142,900      
Weighted average period of unrecognized compensation cost 2 years 1 month 6 days      
Restricted Stock Awards        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award requisite service period 3 years      
Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense $ 12,500 2,700 2,600  
Aggregate value of stock options exercised 28,800 $ 16,500 $ 10,100  
Total unrecognized compensation cost of stock options $ 10,300      
Weighted average period of unrecognized compensation cost 1 year 8 months 12 days      
Fair market value (as a percent) 100.00%      
Stock option term 10 years      
Stock Option Plan 2011        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock reserved for future issuance (shares)       14,000,000.0
Stock Option Plan 2011 | Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Weighted average grant date fair value (USD per share) $ 99.56 $ 35.09 $ 23.68  
Granted Fiscal 2015 | Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period 3 years      
Minimum | Performance Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award requisite service period 1 year      
Maximum | Performance Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award requisite service period 3 years