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STOCK PLANS - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Apr. 19, 2023
Stock Plans |  |  |  |
Common shares available for future grant under all plans (in shares) | 2,192,720 |  |  |
Total stock-based compensation expense | $ 26,223 | $ 25,276 | $ 23,787 |
Tax benefit related to stock-based compensation recognized in the period | 6,711 | 6,363 | 5,988 |
Total unrecognized stock-based compensation expense related to nonvested stock options, restricted shares and restricted stock units | $ 17,254 |  |  |
Weighted average period of recognition of unrecognized stock-based compensation expense (in months) | 1 year |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value | $ 3,684 | 3,086 | 2,983 |
Stock options |  |  |  |
Stock Plans |  |  |  |
Award expiration (in years) | 10 years |  |  |
Award vesting period (in years) | 3 years |  |  |
Aggregate intrinsic value of awards outstanding | $ 99,884 |  |  |
Aggregate intrinsic value of awards exercisable | 82,057 |  |  |
Total intrinsic value of awards exercised | $ 35,414 | $ 7,082 | $ 20,442 |
Restricted Stock Units |  |  |  |
Stock Plans |  |  |  |
Remaining weighted average life of non-vested restricted awards (in years) | 1 year 6 months |  |  |
Performance Shares [Member] |  |  |  |
Stock Plans |  |  |  |
Award vesting period (in years) | 3 years |  |  |
Shares granted | 45,643 |  |  |
Shares granted (in dollars per share) | $ 136.41 |  |  |
Remaining weighted average life of non-vested restricted awards (in years) | 1 year 9 months 18 days |  |  |
RSU and PSU |  |  |  |
Stock Plans |  |  |  |
Shares granted | 130,831 |  |  |
Shares granted (in dollars per share) | $ 180.04 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number | 339,441 | 391,072 |  |
1995 Lincoln Stock Purchase Plan |  |  |  |
Stock Plans |  |  |  |
Maximum additional number of the Company's common shares that may be granted (in shares) | 800,000 |  |  |
Shares purchased (in shares) | 0 | 0 | 9,070,000 |
2015 Employee Plan |  |  |  |
Stock Plans |  |  |  |
Maximum additional number of the Company's common shares that may be granted (in shares) |  |  |  | 2,025,000
2015 Employee Plan | Restricted Stock Units |  |  |  |
Stock Plans |  |  |  |
Shares granted | 85,188 |  |  |
2015 Employee Plan | Performance Shares [Member] |  |  |  |
Stock Plans |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number | 82,089 |  |  |
2015 Director Plan |  |  |  |
Stock Plans |  |  |  |
Maximum additional number of the Company's common shares that may be granted (in shares) |  |  |  | 200,000
2005 Plan | RSU and PSU |  |  |  |
Stock Plans |  |  |  |
Deferred RSUs and PSUs (in shares) | 28,564,000 |  |  |
Deferred RSUs (in shares) | 87,604 |  |  |
Minimum | Restricted Stock Units |  |  |  |
Stock Plans |  |  |  |
Award vesting period (in years) | 3 years |  |  |
Maximum | 1995 Lincoln Stock Purchase Plan |  |  |  |
Stock Plans |  |  |  |
Dollar value of shares that each employee has the ability to purchase on the open market, on a commission-free basis annually under the plan | $ 10 |  |  |

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