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STOCK-BASED COMPENSATION (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
May 31, 2022 | Feb. 28, 2022 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Stock-based Compensation |  |  |  |  |
Stock-based compensation expense |  |  | $ 30.7 | $ 26.6 | $ 21.7
Payments for the purchase of shares to satisfy the employee income tax withholdings |  |  | $ 8.9 | $ 6.2 | 14.2
Restricted Stock Units |  |  |  |  |
Stock-based Compensation |  |  |  |  |
Number of shares of common stock of which unit is convertible (in shares) |  |  | 1 |  |
Vesting period |  |  | 3 years |  |
Qualified retirement eligibility age for grants awarded in and after 2017 |  |  | 55 years |  |
Qualified retirement eligibility number of years of service for grants awarded in and after 2017 |  |  | 10 years |  |
Stock options |  |  |  |  |
Stock-based Compensation |  |  |  |  |
Total intrinsic value of stock options exercised |  |  |  |  | $ 0.9
RSAs and RSUs |  |  |  |  |
Stock-based Compensation |  |  |  |  |
Shares purchased to satisfy the employee income tax withholdings (in shares) |  |  | 68,872 |  |
Payments for the purchase of shares to satisfy the employee income tax withholdings |  |  | $ 8.2 |  |
Vested (in shares) |  |  | 201,457 | 166,598 | 272,258
PSUs |  |  |  |  |
Stock-based Compensation |  |  |  |  |
Number of shares of common stock of which unit is convertible (in shares) |  |  | 1 |  |
Vesting period |  |  | 3 years |  |
Shares purchased to satisfy the employee income tax withholdings (in shares) |  |  | 5,245 |  |
Payments for the purchase of shares to satisfy the employee income tax withholdings |  |  | $ 0.6 |  |
Vested (in shares) |  |  | 16,834 | 29,468 | 48,053
Risk-free interest rate | 2.88% | 1.75% |  |  |
Volatility time period | 3 years | 3 years |  |  |
Expected volatility | 32.80% | 32.20% |  |  |
Correlation to S&P 500 Index time period | 3 years | 3 years |  |  |
Correlation with S&P index | 0.52 | 0.51 |  |  |
Unrecognized compensation expense |  |  | $ 36.9 |  |
Unrecognized compensation expense, period for recognition |  |  | 1 year 10 months 24 days |  |
PSUs | Minimum |  |  |  |  |
Stock-based Compensation |  |  |  |  |
Units ultimately expected to be awarded |  |  | 0.00% |  |
PSUs | Maximum |  |  |  |  |
Stock-based Compensation |  |  |  |  |
Units ultimately expected to be awarded |  |  | 200.00% |  |
Restricted Stock |  |  |  |  |
Stock-based Compensation |  |  |  |  |
Vested (in shares) |  |  | 183,573 |  |
Restricted Stock | Director |  |  |  |  |
Stock-based Compensation |  |  |  |  |
Vesting period |  |  | 1 year |  |

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