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STOCK AWARD PLANS - Narrative (Details) - USD ($)
3 Months Ended 6 Months Ended
Feb. 03, 2021
May 09, 2019
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of additional shares authorized (shares)   4,000,000        
Maximum shares that can be granted under stock plan (shares)     17,041,803   17,041,803  
Shares available for stock awards (shares)     1,798,328   1,798,328  
Stock-based compensation expense     $ 29,161,000 $ 10,954,000 $ 53,150,000 $ 22,351,000
Stock options            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Unrecognized compensation expense     34,800,000   34,800,000  
Stock-based compensation expense     4,027,000 $ 5,025,000 7,994,000 $ 10,038,000
Stock awards            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Unrecognized compensation expense     131,900,000   $ 131,900,000  
Stock awards | Minimum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Discount on outstanding grants (percent)         12.00%  
Stock awards | Maximum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Discount on outstanding grants (percent)         24.00%  
Performance-based restricted stock units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock awards granted (shares) 280,255          
Weighted average grant date fair value (in dollars per share) $ 74.76          
Award vesting period 3 years          
Upside opportunity upon achievement of targets (percent) 200.00%          
Time-based restricted stock units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock awards granted (shares) 619,689          
Weighted average grant date fair value (in dollars per share) $ 71.28          
Award vesting period 3 years          
1997 Employee Stock Purchase Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Maximum employee contribution to purchase company stock     $ 10,000   $ 10,000  
Discount rate used to determine the purchase price         15.00%