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RETIREMENT PLANS - Benefit Obligations and Plan Assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Pension benefits      
Projected benefit obligations:      
Balance at beginning of year $ 100,624 $ 100,624 $ 88,772
Alaska acquisition   15,399  
Service cost 151 229 439
Interest cost 2,373 2,043 2,585
Benefits and settlements paid (18,490) (4,488)  
Actuarial (gain) loss (16,758) (1,297)  
Settlement (1,725) (34)  
Balance at end of year 66,175 100,624 100,624
Plan net assets:      
Balance at beginning of year 103,718 103,718 89,352
Alaska acquisition   12,147  
Actual return on plan assets (13,188) 7,246  
Benefits and settlements paid (18,978) (5,027)  
Balance at end of year 71,552 103,718 103,718
Funded status of plan      
Projected benefit obligation 66,175 100,624 100,624
Plan Net Assets 71,552 103,718 103,718
Over/ (Under) funded status of plan 5,377 3,094  
Pension benefits | GT&T Pension Benefit      
Projected benefit obligations:      
Balance at beginning of year 15,663    
Balance at end of year 2,038 15,663  
Plan net assets:      
Balance at beginning of year 15,663    
Balance at end of year 2,038 15,663  
Funded status of plan      
Projected benefit obligation 2,038 15,663  
Plan Net Assets 2,038 15,663  
Pension benefits | Viya Pension Benefit      
Projected benefit obligations:      
Balance at beginning of year 70,173    
Balance at end of year 52,832 70,173  
Plan net assets:      
Balance at beginning of year 75,952    
Balance at end of year 60,132 75,952  
Funded status of plan      
Projected benefit obligation 52,832 70,173  
Plan Net Assets 60,132 75,952  
Over/ (Under) funded status of plan 7,300 5,779  
Pension benefits | Alaska Pension Benefit      
Projected benefit obligations:      
Balance at beginning of year 14,788    
Balance at end of year 11,305 14,788  
Plan net assets:      
Balance at beginning of year 12,103    
Balance at end of year 9,382 12,103  
Funded status of plan      
Projected benefit obligation 11,305 14,788  
Plan Net Assets 9,382 12,103  
Over/ (Under) funded status of plan (1,923) (2,685)  
Postretirement benefits      
Projected benefit obligations:      
Balance at beginning of year 5,343 5,343 5,510
Alaska acquisition   392  
Service cost 124 143 139
Interest cost 139 127 163
Benefits and settlements paid (396) (390)  
Actuarial (gain) loss (1,586) (439)  
Balance at end of year 3,624 5,343 5,343
Plan net assets:      
Company contributions 396 390  
Benefits and settlements paid (396) (390)  
Funded status of plan      
Projected benefit obligation 3,624 5,343 $ 5,343
Over/ (Under) funded status of plan (3,624) (5,343)  
Postretirement benefits | Viya Pension Benefit      
Projected benefit obligations:      
Balance at beginning of year 4,961    
Balance at end of year 3,337 4,961  
Funded status of plan      
Projected benefit obligation 3,337 4,961  
Over/ (Under) funded status of plan (3,337) (4,961)  
Postretirement benefits | Alaska Pension Benefit      
Projected benefit obligations:      
Balance at beginning of year 382    
Balance at end of year 287 382  
Funded status of plan      
Projected benefit obligation 287 382  
Over/ (Under) funded status of plan $ (287) $ (382)