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POSTRETIREMENT BENEFITS (net periodic benefit income and actuarial assumptions) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Net periodic benefit income |  |  |
Interest cost | $ 968 | $ 1,911 | $ 2,727
Expected return on plan assets | (7,498) | (7,619) | (6,957)
Amortization of prior service credit | (1,421) | (1,421) | (1,421)
Amortization of net actuarial losses | 1,629 | 2,301 | 3,223
Net periodic benefit income | $ (6,322) | $ (4,828) | $ (2,428)
Participants under age 65 [Member] |  |  |
Health care cost trend rates |  |  |
Health care cost trend rate assumed for next year | 6.90% | 7.20% | 7.40%
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 | 2029
Participants age 65 and older [Member] |  |  |
Health care cost trend rates |  |  |
Health care cost trend rate assumed for next year | 7.60% | 8.00% | 8.40%
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 | 2029
Postretirement benefit plan [Member] |  |  |
Net periodic benefit income |  |  |
Interest cost | $ 929 | $ 1,835 |
Actuarial assumptions |  |  |
Discount rate, benefit obligation | 2.61% | 2.16% |
Discount rate, net periodic benefit income | 2.16% | 3.03% | 4.13%
Expected return on plan assets | 5.50% | 6.00% | 6.25%
Pension plan [Member] |  |  |
Net periodic benefit income |  |  |
Interest cost | $ 39 | $ 76 |
Actuarial assumptions |  |  |
Discount rate, benefit obligation | 2.26% | 1.74% |
Discount rate, net periodic benefit income | 1.74% | 2.76% | 4.01%

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