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POSTRETIREMENT BENEFITS (net periodic benefit income and actuarial assumptions) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Net periodic benefit income |  |  |
Interest cost | $ 1,985 | $ 1,121 | $ 968
Postretirement plans, interest cost [Extensible Enumeration] | Other income, net | Other income, net | Other income, net
Expected return on plan assets | $ (7,320) | $ (7,462) | $ (7,498)
Postretirement plans, expected return on plan assets [Extensible Enumeration] | Other income, net | Other income, net | Other income, net
Amortization of prior service credit | $ (1,421) | $ (1,421) | $ (1,421)
Postretirement plans, amortization of prior service credit [Extensible Enumeration] | Other income, net | Other income, net | Other income, net
Amortization of net actuarial losses | $ 2,273 | $ 900 | $ 1,629
Postretirement plans, amortization of net actuarial losses [Extensible Enumeration] | Other income, net | Other income, net | Other income, net
Net periodic benefit income | $ (4,483) | $ (6,862) | $ (6,322)
Participants under age 65 [Member] |  |  |
Health care cost trend rates |  |  |
Health care cost trend rate assumed for next year | 6.60% | 6.60% | 6.90%
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate) | 4.50% | 4.50% | 4.50%
Year that the rate reaches the ultimate trend rate | 2030 | 2030 | 2030
Participants age 65 and older [Member] |  |  |
Health care cost trend rates |  |  |
Health care cost trend rate assumed for next year | 7.30% | 7.30% | 7.60%
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate) | 4.50% | 4.50% | 4.50%
Year that the rate reaches the ultimate trend rate | 2030 | 2030 | 2030
Postretirement benefit plan [Member] |  |  |
Net periodic benefit income |  |  |
Interest cost | $ 1,874 | $ 1,069 |
Actuarial assumptions |  |  |
Discount rate, benefit obligation | 4.89% | 5.09% |
Discount rate, net periodic benefit income | 5.09% | 2.61% | 2.16%
Expected return on plan assets | 6.25% | 5.25% | 5.50%
Pension plan [Member] |  |  |
Net periodic benefit income |  |  |
Interest cost | $ 111 | $ 52 |
Actuarial assumptions |  |  |
Discount rate, benefit obligation | 4.80% | 5.00% |
Discount rate, net periodic benefit income | 5.00% | 2.26% | 1.74%

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