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POSTRETIREMENT BENEFITS (plan assets) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
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 $ 119,052 $ 144,800  
Quoted prices in active markets for identical assets (Level 1) [Member]      
Postretirement benefits [Line Items]      
Fair value of plan assets 0 224  
Significant other observable inputs (Level 2) [Member]      
Postretirement benefits [Line Items]      
Fair value of plan assets 119,052 144,576  
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  
Mortgage-backed securities [Member]      
Postretirement benefits [Line Items]      
Allocation of plan assets 5.00% 41.00%  
Fair value of plan assets $ 5,959 $ 58,799  
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 (94)  
Mortgage-backed securities [Member] | Significant other observable inputs (Level 2) [Member]      
Postretirement benefits [Line Items]      
Fair value of plan assets 5,959 58,893  
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  
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 $ 23,835 $ 28,993  
International equity securities [Member] | Quoted prices in active markets for identical assets (Level 1) [Member]      
Postretirement benefits [Line Items]      
Fair value of plan assets 0 285  
International equity securities [Member] | Significant other observable inputs (Level 2) [Member]      
Postretirement benefits [Line Items]      
Fair value of plan assets 23,835 28,708  
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. corporate debt securities [Member]      
Postretirement benefits [Line Items]      
Allocation of plan assets 55.00% 19.00%  
Fair value of plan assets $ 65,700 $ 27,858  
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 22  
U.S. corporate debt securities [Member] | Significant other observable inputs (Level 2) [Member]      
Postretirement benefits [Line Items]      
Fair value of plan assets 65,700 27,836  
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  
U,S, large capitalization equity securities [Member]      
Postretirement benefits [Line Items]      
Allocation of plan assets 17.00% 17.00%  
Target allocation of plan assets 17.00%    
Fair value of plan assets $ 20,496 $ 25,395  
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 (15)  
U,S, large capitalization equity securities [Member] | Significant other observable inputs (Level 2) [Member]      
Postretirement benefits [Line Items]      
Fair value of plan assets 20,496 25,410  
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  
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 $ 3,062 $ 3,755  
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 26  
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 3,062 3,729  
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 60.00%    
Postretirement benefit plan [Member]      
Postretirement benefits [Line Items]      
Fair value of plan assets $ 119,052 $ 144,800 $ 139,372