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SHARE-BASED COMPENSATION - Stock Option Activity (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Weighted Average Exercise Price Per Share          
Exercised, weighted average exercise price per share (in dollars per share)     $ 17.46    
Risk-free interest rate     1.45%    
Expected life (in years)     6 years 4 months 17 days    
Dividend yield     0.00%    
Volatility     28.46%    
Grant date fair value     $ 7.74    
Performance Based Vesting          
Weighted Average Exercise Price Per Share          
Risk-free interest rate     1.46%    
Dividend yield     0.00%    
Volatility     34.22%    
Performance Based Vesting | Term Two          
Weighted Average Exercise Price Per Share          
Expected life (in years)     6 years    
Performance Based Vesting | Term One          
Weighted Average Exercise Price Per Share          
Expected life (in years)     4 years    
2017 LTIP          
Weighted Average Exercise Price Per Share          
Beginning balance (in dollars per share)     $ 19.12    
Granted (in dollars per share)     28.32    
Forfeited (in dollars per share)     21.44    
Ending balance (in dollars per share) $ 25.31   25.31    
Options exercisable (in dollars per share) $ 17.70   $ 17.70    
Options outstanding, Weighted Average Remaining Contractual Term (in years)     9 years 1 month 20 days 8 years 8 months 26 days  
Options exercisable, Weighted Average Remaining Contractual Term (in years)     7 years 2 months 1 day    
Options outstanding, Aggregate Intrinsic Value $ 49,108,141,000   $ 49,108,141,000   $ 112,915,000
Options exercisable, Aggregate Intrinsic Value $ 3,848,578,000   $ 3,848,578,000    
2017 LTIP | Shares Under Option          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]          
Beginning balance (in shares)     14,083,741    
Granted (in shares)     26,093,256    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period     209,105    
Forfeited (in shares)     (1,749,476)    
Ending balance (in shares) 38,218,416   38,218,416    
Options exercisable (in shares) 788,053   788,053    
Weighted Average Exercise Price Per Share          
Share based compensation expense $ 25,327,000 $ 7,817,000 $ 45,676,000 $ 15,134,000  
Share based compensation - Unrecognized deferred compensation cost 200,745,000   $ 200,745,000    
Expected time (in years) unrecogized compensation costs relating to share based awards will be recognized     2016-03    
2017 LTIP | Performance Based Vesting          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]          
Granted (in shares)     7,480,469    
Weighted Average Exercise Price Per Share          
Share based compensation expense 4,419,000   $ 8,320,000    
Share based compensation - Unrecognized deferred compensation cost 71,127,000   $ 71,127,000    
Expected time (in years) unrecogized compensation costs relating to share based awards will be recognized     2006-05    
Grant date fair value     $ 10.65    
2019 LTIP [Member] | Restricted Stock [Member]          
Weighted Average Exercise Price Per Share          
Share based compensation expense $ 636,000   $ 1,212,000