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EMPLOYEE BENEFIT PLANS - Valuation Assumptions (Details)
Dec. 31, 2021
Dec. 31, 2020
Fixed Income    
Employee benefit plans    
Long-term rate of return on plan assets 3.34%  
Short-term cash investments    
Employee benefit plans    
Long-term rate of return on plan assets 2.35%  
Pension Benefits    
Employee benefit plans    
Discount rate 3.28% 3.08%
Long-term rate of return on plan assets 6.34% 6.50%
Rate of compensation increases 4.25% 4.00%
Cost of living adjustment 2.20% 2.10%
Pension Benefits | SERP    
Employee benefit plans    
Discount rate 3.18% 2.97%
Rate of compensation increases 5.00% 5.00%
Pension Benefits | Other Benefits    
Employee benefit plans    
Discount rate 0.00% 0.00%
Other Benefits    
Employee benefit plans    
Discount rate 0.00% 0.00%
Long-term rate of return on plan assets 5.88% 6.00%
Rate of compensation increases 0.00% 0.00%
Cost of living adjustment 0.00% 0.00%
Other Benefits | SERP    
Employee benefit plans    
Discount rate 0.00% 0.00%
Rate of compensation increases 0.00% 0.00%
Other Benefits | Other Benefits    
Employee benefit plans    
Discount rate 3.27% 3.03%