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POSTRETIREMENT BENEFITS (plan assets) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Postretirement benefits [Line Items]      
Postretirement benefit plan, plan assets [Extensible List] Postretirement benefit plan [Member] Postretirement benefit plan [Member]  
Allocation of plan assets 100.00% 100.00%  
Fair value of plan assets $ 130,914 $ 119,052  
Quoted prices in active markets for identical assets (Level 1) [Member]      
Postretirement benefits [Line Items]      
Fair value of plan assets 0 0  
Significant other observable inputs (Level 2) [Member]      
Postretirement benefits [Line Items]      
Fair value of plan assets 130,914 119,052  
Significant unobservable inputs (Level 3) [Member]      
Postretirement benefits [Line Items]      
Fair value of plan assets 0 0  
Investments measured at net asset value [Member]      
Postretirement benefits [Line Items]      
Fair value of plan assets $ 0 $ 0  
U.S. corporate debt securities [Member]      
Postretirement benefits [Line Items]      
Allocation of plan assets 54.00% 55.00%  
Fair value of plan assets $ 71,225 $ 65,700  
U.S. corporate debt securities [Member] | Quoted prices in active markets for identical assets (Level 1) [Member]      
Postretirement benefits [Line Items]      
Fair value of plan assets 0 0  
U.S. corporate debt securities [Member] | Significant other observable inputs (Level 2) [Member]      
Postretirement benefits [Line Items]      
Fair value of plan assets 71,225 65,700  
U.S. corporate debt securities [Member] | Significant unobservable inputs (Level 3) [Member]      
Postretirement benefits [Line Items]      
Fair value of plan assets 0 0  
U.S. corporate debt securities [Member] | Investments measured at net asset value [Member]      
Postretirement benefits [Line Items]      
Fair value of plan assets $ 0 $ 0  
International equity securities [Member]      
Postretirement benefits [Line Items]      
Allocation of plan assets 20.00% 20.00%  
Target allocation of plan assets 20.00%    
Fair value of plan assets $ 26,441 $ 23,835  
International equity securities [Member] | Quoted prices in active markets for identical assets (Level 1) [Member]      
Postretirement benefits [Line Items]      
Fair value of plan assets 0 0  
International equity securities [Member] | Significant other observable inputs (Level 2) [Member]      
Postretirement benefits [Line Items]      
Fair value of plan assets 26,441 23,835  
International equity securities [Member] | Significant unobservable inputs (Level 3) [Member]      
Postretirement benefits [Line Items]      
Fair value of plan assets 0 0  
International equity securities [Member] | Investments measured at net asset value [Member]      
Postretirement benefits [Line Items]      
Fair value of plan assets $ 0 $ 0  
U,S, large capitalization equity securities [Member]      
Postretirement benefits [Line Items]      
Allocation of plan assets 18.00% 17.00%  
Target allocation of plan assets 18.00%    
Fair value of plan assets $ 23,143 $ 20,496  
U,S, large capitalization equity securities [Member] | Quoted prices in active markets for identical assets (Level 1) [Member]      
Postretirement benefits [Line Items]      
Fair value of plan assets 0 0  
U,S, large capitalization equity securities [Member] | Significant other observable inputs (Level 2) [Member]      
Postretirement benefits [Line Items]      
Fair value of plan assets 23,143 20,496  
U,S, large capitalization equity securities [Member] | Significant unobservable inputs (Level 3) [Member]      
Postretirement benefits [Line Items]      
Fair value of plan assets 0 0  
U,S, large capitalization equity securities [Member] | Investments measured at net asset value [Member]      
Postretirement benefits [Line Items]      
Fair value of plan assets $ 0 $ 0  
Mortgage-backed securities [Member]      
Postretirement benefits [Line Items]      
Allocation of plan assets 5.00% 5.00%  
Fair value of plan assets $ 6,540 $ 5,959  
Mortgage-backed securities [Member] | Quoted prices in active markets for identical assets (Level 1) [Member]      
Postretirement benefits [Line Items]      
Fair value of plan assets 0 0  
Mortgage-backed securities [Member] | Significant other observable inputs (Level 2) [Member]      
Postretirement benefits [Line Items]      
Fair value of plan assets 6,540 5,959  
Mortgage-backed securities [Member] | Significant unobservable inputs (Level 3) [Member]      
Postretirement benefits [Line Items]      
Fair value of plan assets 0 0  
Mortgage-backed securities [Member] | Investments measured at net asset value [Member]      
Postretirement benefits [Line Items]      
Fair value of plan assets $ 0 $ 0  
U.S. small and mid-capitalization equity securities [Member]      
Postretirement benefits [Line Items]      
Allocation of plan assets 3.00% 3.00%  
Target allocation of plan assets 3.00%    
Fair value of plan assets $ 3,565 $ 3,062  
U.S. small and mid-capitalization equity securities [Member] | Quoted prices in active markets for identical assets (Level 1) [Member]      
Postretirement benefits [Line Items]      
Fair value of plan assets 0 0  
U.S. small and mid-capitalization equity securities [Member] | Significant other observable inputs (Level 2) [Member]      
Postretirement benefits [Line Items]      
Fair value of plan assets 3,565 3,062  
U.S. small and mid-capitalization equity securities [Member] | Significant unobservable inputs (Level 3) [Member]      
Postretirement benefits [Line Items]      
Fair value of plan assets 0 0  
U.S. small and mid-capitalization equity securities [Member] | Investments measured at net asset value [Member]      
Postretirement benefits [Line Items]      
Fair value of plan assets $ 0 0  
Fixed income securities [Member]      
Postretirement benefits [Line Items]      
Target allocation of plan assets 59.00%    
Postretirement benefit plan [Member]      
Postretirement benefits [Line Items]      
Fair value of plan assets $ 130,914 $ 119,052 $ 144,800