EMPLOYEE BENEFIT PLANS - Postretirement Benefits Other than Pensions - Actuarial Gains and Losses (Details) - Postretirement Medical Benefit Plans - USD ($) $ in Thousands |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2026 |
Sep. 30, 2025 |
Sep. 30, 2026 |
Sep. 30, 2025 |
|
| Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax [Roll Forward] | ||||
| Amounts included in accumulated other comprehensive income at beginning of period | $ 161 | |||
| Amortization of actuarial gain into other income | $ (100) | $ 0 | (100) | $ 0 |
| Amounts included in accumulated other comprehensive income at end of period | $ 61 | $ 61 | ||