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POSTRETIREMENT BENEFITS (obligations and funded status) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Change in benefit obligation      
Interest cost $ 1,121 $ 968 $ 1,911
Change in plan assets      
Fair value of plan assets, beginning of year 144,800    
Fair value of plan assets, end of year 119,052 144,800  
Amounts recognized on the consolidated balance sheets      
Other non-current assets 79,343 87,019  
Amounts recognized in accumulated other comprehensive loss      
Unrecognized prior service credit 8,493 9,914  
Unrecognized net actuarial loss (39,871) (25,445)  
Tax effect 4,506 100  
Amount recognized in accumulated other comprehensive loss, net of tax (26,872) (15,431)  
Postretirement benefit plan [Member]      
Change in benefit obligation      
Benefit obligation, beginning of year 57,781 68,164  
Interest cost 1,069 929  
Net actuarial (gain) loss (13,839) (5,721)  
Benefits paid from plan assets and company funds (5,302) (5,591)  
Benefit obligation, end of year 39,709 57,781 68,164
Change in plan assets      
Fair value of plan assets, beginning of year 144,800 139,372  
Return (loss) on plan assets (22,116) 10,159  
Benefits paid (3,632) (4,731)  
Fair value of plan assets, end of year 119,052 144,800 139,372
Funded status 79,343 87,019  
Amounts recognized on the consolidated balance sheets      
Other non-current assets $ 79,343 87,019  
Amounts recognized in accumulated other comprehensive loss      
Amortization period net actuarial loss 12 years 4 months 24 days    
Pension plan [Member]      
Change in benefit obligation      
Benefit obligation, beginning of year [1] $ 3,060 3,343  
Interest cost 52 39  
Net actuarial (gain) loss (414) 2  
Benefits paid from plan assets and company funds (324) (324)  
Benefit obligation, end of year [1] 2,374 3,060 3,343
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 (2,374) (3,060)  
Amounts recognized on the consolidated balance sheets      
Accrued liabilities 324 324  
Other non-current liabilities $ 2,050 $ 2,736  
[1] The accumulated benefit obligation equals the projected benefit obligation