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POSTRETIREMENT BENEFITS (obligations and funded status) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Change in benefit obligation      
Interest cost $ 1,985 $ 1,121 $ 968
Change in plan assets      
Fair value of plan assets, beginning of year 119,052    
Fair value of plan assets, end of year 130,914 119,052  
Amounts recognized on the consolidated balance sheets      
Other non-current assets 94,939 79,343  
Amounts recognized in accumulated other comprehensive loss      
Unrecognized net actuarial loss (29,019) (39,871)  
Unrecognized prior service credit 7,071 8,493  
Tax effect 2,124 4,506  
Amount recognized in accumulated other comprehensive loss, net of tax (19,824) (26,872)  
Postretirement benefit plan [Member]      
Change in benefit obligation      
Benefit obligation, beginning of year 39,709 57,781  
Interest cost 1,874 1,069  
Net actuarial (gain) loss (785) (13,839)  
Benefits paid from plan assets and company funds (4,823) (5,302)  
Benefit obligation, end of year 35,975 39,709 57,781
Change in plan assets      
Fair value of plan assets, beginning of year 119,052 144,800  
Return (loss) on plan assets 15,241 (22,116)  
Benefits paid (3,379) (3,632)  
Fair value of plan assets, end of year 130,914 119,052 144,800
Funded status 94,939 79,343  
Amounts recognized on the consolidated balance sheets      
Other non-current assets $ 94,939 79,343  
Amounts recognized in accumulated other comprehensive loss      
Amortization period net actuarial loss 12 years    
Pension plan [Member]      
Change in benefit obligation      
Benefit obligation, beginning of year [1] $ 2,374 3,060  
Interest cost 111 52  
Net actuarial (gain) loss 128 (414)  
Benefits paid from plan assets and company funds (324) (324)  
Benefit obligation, end of year [1] 2,289 2,374 3,060
Change in plan assets      
Fair value of plan assets, beginning of year 0 0  
Fair value of plan assets, end of year 0 0 $ 0
Funded status (2,289) (2,374)  
Amounts recognized on the consolidated balance sheets      
Accrued liabilities 324 324  
Other non-current liabilities $ 1,965 $ 2,050  
[1] The accumulated benefit obligation equals the projected benefit obligation