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RETIREMENT PLANS - SERP (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023
RETIREMENT PLANS |  |  |  |  |
Tax-free gains related to life insurance policy claims |  |  | $ 2,380 |  |
Supplemental Retirement Plan ('SERP') |  |  |  |  |
RETIREMENT PLANS |  |  |  |  |
Fair value of plan assets | $ 30,700 |  | 30,700 |  | $ 26,800
Trading gains (losses), net | 1,000 | $ (305) | 2,700 | $ 903 |
Defined benefit plan | 24,400 |  | 24,400 |  | $ 23,700
Supplemental Retirement Plan ('SERP') | Selling, general and administrative expenses |  |  |  |  |
RETIREMENT PLANS |  |  |  |  |
Unrealized gains (loss) | $ 1,100 | $ (262) | $ 2,800 | $ 1,000 |

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