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RETIREMENT PLANS - Benefit Obligations and Plan Assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Pension benefits      
Projected benefit obligations:      
Balance at beginning of year $ 66,175 $ 100,624  
Service cost 90 151 $ 229
Interest cost 3,323 2,373 2,043
Benefits and settlements paid (6,899) (18,490)  
Actuarial (gain) loss 1,460 (16,758)  
Settlement   (1,725)  
Balance at end of year 64,149 66,175 100,624
Plan net assets:      
Balance at beginning of year 71,552 103,718  
Actual return on plan assets 7,142 (13,188)  
Company contributions 207    
Benefits and settlements paid (7,397) (18,978)  
Balance at end of year 71,504 71,552 103,718
Funded status of plan      
Projected benefit obligation 64,149 66,175 100,624
Plan Net Assets 71,504 71,552 103,718
Over/ (Under) funded status of plan 7,355 5,377  
Pension benefits | GT&T Pension Benefit      
Projected benefit obligations:      
Balance at beginning of year 2,038    
Balance at end of year   2,038  
Plan net assets:      
Balance at beginning of year 2,038    
Balance at end of year   2,038  
Funded status of plan      
Projected benefit obligation   2,038  
Plan Net Assets   2,038  
Pension benefits | Viya Pension Benefit      
Projected benefit obligations:      
Balance at beginning of year 52,832    
Balance at end of year 53,075 52,832  
Plan net assets:      
Balance at beginning of year 60,132    
Balance at end of year 62,142 60,132  
Funded status of plan      
Projected benefit obligation 53,075 52,832  
Plan Net Assets 62,142 60,132  
Over/ (Under) funded status of plan 9,067 7,300  
Pension benefits | Alaska Pension Benefit      
Projected benefit obligations:      
Balance at beginning of year 11,305    
Balance at end of year 11,074 11,305  
Plan net assets:      
Balance at beginning of year 9,382    
Balance at end of year 9,362 9,382  
Funded status of plan      
Projected benefit obligation 11,074 11,305  
Plan Net Assets 9,362 9,382  
Over/ (Under) funded status of plan (1,712) (1,923)  
Postretirement benefits      
Projected benefit obligations:      
Balance at beginning of year 3,624 5,343  
Service cost 65 124 143
Interest cost 182 139 127
Benefits and settlements paid (309) (396)  
Actuarial (gain) loss 63 (1,586)  
Balance at end of year 3,625 3,624 5,343
Plan net assets:      
Company contributions 309 396  
Benefits and settlements paid (309) (396)  
Funded status of plan      
Projected benefit obligation 3,625 3,624 $ 5,343
Over/ (Under) funded status of plan (3,625) (3,624)  
Postretirement benefits | Viya Pension Benefit      
Projected benefit obligations:      
Balance at beginning of year 3,337    
Balance at end of year 3,341 3,337  
Funded status of plan      
Projected benefit obligation 3,341 3,337  
Over/ (Under) funded status of plan (3,341) (3,337)  
Postretirement benefits | Alaska Pension Benefit      
Projected benefit obligations:      
Balance at beginning of year 287    
Balance at end of year 284 287  
Funded status of plan      
Projected benefit obligation 284 287  
Over/ (Under) funded status of plan $ (284) $ (287)