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POSTRETIREMENT BENEFITS (net periodic benefit income and actuarial assumptions) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Net periodic benefit income      
Interest cost $ 1,121 $ 968 $ 1,911
Postretirement plans, interest cost [Extensible Enumeration] Other income Other income Other income
Expected return on plan assets $ (7,462) $ (7,498) $ (7,619)
Postretirement plans, expected return on plan assets [Extensible Enumeration] Other income Other income Other income
Amortization of prior service credit $ (1,421) $ (1,421) $ (1,421)
Postretirement plans, amortization of prior service credit [Extensible Enumeration] Other income Other income Other income
Amortization of net actuarial losses $ 900 $ 1,629 $ 2,301
Postretirement plans, amortization of net actuarial losses [Extensible Enumeration] Other income Other income Other income
Net periodic benefit income $ (6,862) $ (6,322) $ (4,828)
Participants under age 65 [Member]      
Health care cost trend rates      
Health care cost trend rate assumed for next year 6.60% 6.90% 7.20%
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% 7.60% 8.00%
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 $ 1,069 $ 929  
Actuarial assumptions      
Discount rate, benefit obligation 5.09% 2.61%  
Discount rate, net periodic benefit income 2.61% 2.16% 3.03%
Expected return on plan assets 5.25% 5.50% 6.00%
Pension plan [Member]      
Net periodic benefit income      
Interest cost $ 52 $ 39  
Actuarial assumptions      
Discount rate, benefit obligation 5.00% 2.26%  
Discount rate, net periodic benefit income 2.26% 1.74% 2.76%