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STOCK-BASED COMPENSATION - Restricted stock activity (Details) - USD ($)	1 Months Ended	12 Months Ended
	May 31, 2018	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Employee Stock Purchase Plan
Compensation expense		$ 26,600,000	$ 21,700,000	$ 21,800,000
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		$ 400,000	$ 300,000	$ 400,000
Shares were reserved for future issuance		655,078
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)		342,082	436,013	631,764
Granted (in shares)		298,084	193,912	216,891
Vested (in shares)		(166,598)	(272,258)	(313,856)
Forfeited (in shares)		(30,249)	(15,585)	(98,786)
Ending balance (in shares)		443,319	342,082	436,013
Weighted average grant date fair value
Beginning balance (in USD per share)		$ 108.40	$ 91.58	$ 85.85
Granted (in dollars per share)		92.32	115.89	93.45
Vested (in USD per share)		106.13	88.32	83.25
Forfeited (in USD per share)		97.01	106.70	85.50
Ending balance (in USD per share)		$ 99.22	$ 108.40	$ 91.58
Restricted Stock
Number of shares
Vested (in shares)		(149,071)
PSUs
Number of shares
Beginning balance (in shares)		122,666	132,248	151,842
Granted (in shares)		71,302	72,975	86,134
Vested (in shares)		(29,468)	(48,053)	(69,372)
Forfeited (in shares)		(12,090)	(34,504)	(36,356)
Ending balance (in shares)		152,410	122,666	132,248
Weighted average grant date fair value
Beginning balance (in USD per share)		$ 115.18	$ 107.21	$ 100.81
Granted (in dollars per share)		98.32	125.62	88.22
Vested (in USD per share)		111.45	108.91	74.56
Forfeited (in USD per share)		110.20	109.85	97.78
Ending balance (in USD per share)		$ 108.41	$ 115.18	$ 107.21

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