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STOCK-BASED COMPENSATION - Restricted stock activity (Details) - USD ($)	1 Months Ended	3 Months Ended
	May 31, 2018	Mar. 31, 2023	Mar. 31, 2022
Employee Stock Purchase Plan
Compensation expense		$ 16,900,000	$ 9,100,000
ESPP
Employee Stock Purchase Plan
Number of shares of common stock made available for purchase to employees	750,000
Maximum percentage of annual salary that an employee is permitted to utilize to purchase stock	10.00%
Maximum number of shares that a participant can purchase during any single offering period	312
Maximum fair market value of stock an employee can purchase under the plan per calendar year	$ 25,000
Exercise price per share of common stock as a percent of fair market value	85.00%
Compensation expense		$ 300,000	$ 100,000
Shares were reserved for future issuance		585,939
RSAs and RSUs
Number of shares
Beginning balance (in shares)		556,062
Granted (in shares)		304,433
Vested (in shares)		(201,977)
Forfeited (in shares)		(3,550)
Ending balance of Outstanding and exercisable (in shares)		654,968
Weighted average grant date fair value
Beginning balance (in USD per share)		$ 112.07
Granted (in dollars per share)		124.89
Vested (in USD per share)		108.20
Forfeited (in USD per share)		115.89
Ending balance of Outstanding and exercisable (in USD per share)		$ 119.20
PSUs
Number of shares
Beginning balance (in shares)		166,702
Granted (in shares)		84,686
Vested (in shares)		(55,399)
Forfeited (in shares)		(3,911)
Ending balance of Outstanding and exercisable (in shares)		192,078
Weighted average grant date fair value
Beginning balance (in USD per share)		$ 125.08
Granted (in dollars per share)		142.09
Vested (in USD per share)		130.05
Forfeited (in USD per share)		154.00
Ending balance of Outstanding and exercisable (in USD per share)		$ 130.56

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The highest percentage of annual salary that an employee is permitted to utilize with respect to the plan.

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