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STOCK-BASED COMPENSATION - Restricted stock activity (Details) - USD ($)	1 Months Ended	3 Months Ended		9 Months Ended
	May 31, 2018	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Employee Stock Purchase Plan
Compensation expense		$ 5,500,000	$ 4,400,000	$ 22,700,000	$ 17,300,000
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	$ 18,600	$ 300,000	$ 200,000
Shares were reserved for future issuance		655,112		655,112
ESPP | US
Employee Stock Purchase Plan
Exercise price per share of common stock as a percent of fair market value	90.00%
ESPP | International
Employee Stock Purchase Plan
Exercise price per share of common stock as a percent of fair market value	85.00%
Restricted Stock and Restricted Stock Units
Number of shares
Beginning balance (in shares)				342,082
Granted (in shares)				296,941
Vested (in shares)				(161,305)
Forfeited (in shares)				(10,042)
Ending balance (in shares)		467,676		467,676
Weighted average grant date fair value
Beginning balance (in USD per share)				$ 108.40
Granted (in dollars per share)				92.17
Vested (in USD per share)				106.44
Forfeited (in USD per share)				95.85
Ending balance (in USD per share)		$ 99.04		$ 99.04
Performance-Based Restricted Stock Units
Number of shares
Beginning balance (in shares)				122,666
Granted (in shares)				71,302
Vested (in shares)				(29,468)
Forfeited (in shares)				(2,318)
Ending balance (in shares)		162,182		162,182
Weighted average grant date fair value
Beginning balance (in USD per share)				$ 115.18
Granted (in dollars per share)				98.32
Vested (in USD per share)				111.45
Forfeited (in USD per share)				116.73
Ending balance (in USD per share)		$ 108.42		$ 108.42

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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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 weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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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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