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EMPLOYEE BENEFIT PLANS - Other Comprehensive Income (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Pension Benefits (a) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net (losses) gains | $ (1,438) | $ 362 | $ 11,262
Amortization of losses | 6 | 738 | 1,154
Settlement expense | 2,036 | 0 | 0
Postretirement |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net (losses) gains | (11) | 512 | 40
Amortization of losses | 0 | 15 | 20
Settlement expense | $ 0 | $ 0 | $ 0

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