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STOCK-BASED COMPENSATION - Restricted stock activity (Details) - USD ($)	1 Months Ended	3 Months Ended		6 Months Ended
	May 31, 2018	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Employee Stock Purchase Plan
Compensation expense		$ 7,000,000.0	$ 5,500,000	$ 16,100,000	$ 17,200,000
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
Compensation expense		$ 100,000	$ 100,000	$ 200,000	$ 200,000
Shares were reserved for future issuance		637,225		637,225
ESPP | US.
Employee Stock Purchase Plan
Exercise price per share of common stock as a percent of fair market value	90.00%
ESPP | Outside of US
Employee Stock Purchase Plan
Exercise price per share of common stock as a percent of fair market value	85.00%
RSAs and RSUs
Number of shares
Beginning balance (in shares)				443,319
Granted (in shares)				300,266
Vested (in shares)				(196,447)
Forfeited (in shares)				(29,019)
Ending balance (in shares)		518,119		518,119
Weighted average grant date fair value
Beginning balance (in USD per share)				$ 99.22
Granted (in dollars per share)				118.65
Vested (in USD per share)				99.58
Forfeited (in USD per share)				101.93
Ending balance (in USD per share)		$ 110.19		$ 110.19
PSUs
Number of shares
Beginning balance (in shares)				152,410
Granted (in shares)				64,668
Vested (in shares)				(16,834)
Forfeited (in shares)				(33,542)
Ending balance (in shares)		166,702		166,702
Weighted average grant date fair value
Beginning balance (in USD per share)				$ 108.41
Granted (in dollars per share)				141.41
Vested (in USD per share)				96.00
Forfeited (in USD per share)				95.40
Ending balance (in USD per share)		$ 125.08		$ 125.08

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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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