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STOCK-BASED COMPENSATION (Details) $ in Millions | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Feb. 28, 2023 item | Dec. 31, 2023 USD ($) shares | Dec. 31, 2022 USD ($) shares | Dec. 31, 2021 USD ($) shares | Dec. 31, 2020 shares
Stock-based Compensation |  |  |  |  |
Stock-based compensation expense | $ |  | $ 33.9 | $ 30.7 | $ 26.6 |
Payments for the purchase of shares to satisfy the employee income tax withholdings | $ |  | 13.9 | 8.9 | 6.2 |
Non-employee Director |  |  |  |  |
Stock-based Compensation |  |  |  |  |
Stock-based compensation expense | $ |  | $ 1.9 | $ 1.9 | $ 2.0 |
Restricted Stock Units |  |  |  |  |
Stock-based Compensation |  |  |  |  |
Number of shares of common stock of which unit is convertible (in shares) |  | 1 |  |  |
Vesting period |  | 3 years |  |  |
Period of advance notice required |  | 6 months |  |  |
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 |  |  |
Restricted Stock Units | Non-employee Director |  |  |  |  |
Stock-based Compensation |  |  |  |  |
Vesting period |  | 1 year |  |  |
RSAs |  |  |  |  |
Stock-based Compensation |  |  |  |  |
Non vested RSAs |  | 0 |  |  |
PSUs |  |  |  |  |
Stock-based Compensation |  |  |  |  |
Number of shares of common stock of which unit is convertible (in shares) |  | 1 |  |  |
Vesting period |  | 3 years |  |  |
Non vested RSAs |  | 134,484 | 166,702 | 152,410 | 122,666
Shares purchased to satisfy the employee income tax withholdings (in shares) |  | 21,459 |  |  |
Payments for the purchase of shares to satisfy the employee income tax withholdings | $ |  | $ 2.7 |  |  |
Vested (in shares) |  | 55,399 | 16,834 | 29,468 |
Risk-free interest rate | 4.10% |  |  |  |
Volatility time period | 3 years |  |  |  |
Expected volatility | 33.50% |  |  |  |
Correlation to S&P 500 Index time period | 3 years |  |  |  |
Correlation with S&P index | item | 0.53 |  |  |  |
Unrecognized compensation expense | $ |  | $ 49.0 |  |  |
Unrecognized compensation expense, period for recognition |  | 2 years |  |  |
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) |  | 219,527 |  |  |
Restricted Stock and Restricted Stock Units |  |  |  |  |
Stock-based Compensation |  |  |  |  |
Non vested RSAs |  | 638,181 | 556,062 | 443,319 | 342,082
Shares purchased to satisfy the employee income tax withholdings (in shares) |  | 85,001 |  |  |
Payments for the purchase of shares to satisfy the employee income tax withholdings | $ |  | $ 11.2 |  |  |
Vested (in shares) |  | 237,315 | 201,457 | 166,598 |

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