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RETIREMENT PLANS - Benefit Obligations and Plan Assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Pension benefits      
Projected benefit obligations:      
Balance at beginning of year $ 64,149 $ 66,175  
Service cost 80 90 $ 151
Interest cost 3,190 3,323 2,373
Benefits and settlements paid (4,896) (6,899)  
Actuarial (gain) loss (2,157) 1,460  
Balance at end of year 60,366 64,149 66,175
Plan net assets:      
Balance at beginning of year 71,504 71,552  
Actual return on plan assets 2,870 7,142  
Company contributions 391 207  
Benefits and settlements paid (4,896) (7,397)  
Balance at end of year 69,869 71,504 71,552
Funded status of plan      
Projected benefit obligation 60,366 64,149 66,175
Plan Net Assets 69,869 71,504 71,552
Over/ (Under) funded status of plan 9,503 7,355  
Pension benefits | Viya Pension Benefit      
Projected benefit obligations:      
Balance at beginning of year 53,075    
Balance at end of year 49,889 53,075  
Plan net assets:      
Balance at beginning of year 62,142    
Balance at end of year 60,250 62,142  
Funded status of plan      
Projected benefit obligation 49,889 53,075  
Plan Net Assets 60,250 62,142  
Over/ (Under) funded status of plan 10,361 9,067  
Pension benefits | Alaska Pension Benefit      
Projected benefit obligations:      
Balance at beginning of year 11,074    
Balance at end of year 10,477 11,074  
Plan net assets:      
Balance at beginning of year 9,362    
Balance at end of year 9,619 9,362  
Funded status of plan      
Projected benefit obligation 10,477 11,074  
Plan Net Assets 9,619 9,362  
Over/ (Under) funded status of plan (858) (1,712)  
Postretirement benefits      
Projected benefit obligations:      
Balance at beginning of year 3,625 3,624  
Service cost 76 65 124
Interest cost 195 182 139
Benefits and settlements paid (426) (309)  
Actuarial (gain) loss 61 63  
Balance at end of year 3,531 3,625 3,624
Plan net assets:      
Company contributions 426 309  
Benefits and settlements paid (426) (309)  
Funded status of plan      
Projected benefit obligation 3,531 3,625 $ 3,624
Over/ (Under) funded status of plan (3,531) (3,625)  
Postretirement benefits | Viya Pension Benefit      
Projected benefit obligations:      
Balance at beginning of year 3,341    
Balance at end of year 3,262 3,341  
Funded status of plan      
Projected benefit obligation 3,262 3,341  
Over/ (Under) funded status of plan (3,262) (3,341)  
Postretirement benefits | Alaska Pension Benefit      
Projected benefit obligations:      
Balance at beginning of year 284    
Balance at end of year 269 284  
Funded status of plan      
Projected benefit obligation 269 284  
Over/ (Under) funded status of plan $ (269) $ (284)