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STOCK-BASED COMPENSATION - Summary of Restricted Stock Unit Activity and Performance Stock Units (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2022
Dec. 31, 2021
Aggregate Intrinsic Value    
Share price (in usd per share) $ 201.78  
Restricted stock units    
Number of Shares Outstanding    
Outstanding, beginning balance (in shares) 2,786  
Granted (in shares) 153  
Vested (in shares) (639)  
Canceled (in shares) (43)  
Outstanding, ending balance (in shares) 2,257  
Number of shares outstanding, expected to vest (in shares) 2,257  
Weighted Average Fair Value per Share at Grant Date    
Outstanding, beginning balance (in usd per share) $ 100.73  
Granted (in usd per share) 150.81  
Vested (in usd per share) 70.19  
Canceled (in usd per share) 120.94  
Outstanding, ending balance (in usd per share) 112.40  
Weighted-Average Fair Value per Share at Grant Date, Expected to vest (in usd per share) $ 112.40  
Weighted-Average Remaining Contractual Term    
Outstanding 1 year 3 months 18 days  
Expected to vest 1 year 3 months 18 days  
Aggregate Intrinsic Value    
Outstanding $ 455,509
Vested 102,631  
Aggregate intrinsic value, expected to vest $ 455,509  
Performance shares    
Number of Shares Outstanding    
Outstanding, beginning balance (in shares) 445  
Granted (in shares) 27  
Vested (in shares) (303)  
Canceled (in shares) (169)  
Outstanding, ending balance (in shares) 0  
Weighted Average Fair Value per Share at Grant Date    
Outstanding, beginning balance (in usd per share) $ 169.82  
Granted (in usd per share) 160.09  
Vested (in usd per share) 168.88  
Canceled (in usd per share) 169.93  
Outstanding, ending balance (in usd per share) $ 0  
Weighted-Average Remaining Contractual Term    
Outstanding 0 years  
Aggregate Intrinsic Value    
Outstanding $ 0
Vested $ 51,393