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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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