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GOVERNMENT SUPPORT AND SPECTRUM MATTERS - Narrative (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2024
Jun. 30, 2025
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2023
Jul. 31, 2022
GOVERNMENT SUPPORT AND SPECTRUM MATTERS            
Government capital programs - Amounts received     $ 41,364 $ 43,686    
Grant funds awarded during the period     15,781      
Amounts accrued for reimbursable capital expenditures from government capital programs     18,279 $ 27,418    
Alaska Connect Fund | Grant receivable from January 1, 2025 through December 2028            
GOVERNMENT SUPPORT AND SPECTRUM MATTERS            
Grants expected to be received per year   $ 25,600 25,600      
Universal Service Fund programs            
GOVERNMENT SUPPORT AND SPECTRUM MATTERS            
Grant funds awarded annually     2,500      
Connect America Fund II            
GOVERNMENT SUPPORT AND SPECTRUM MATTERS            
Grant funds awarded annually     8,000      
Connect America Fund Phase II Program in Alaska            
GOVERNMENT SUPPORT AND SPECTRUM MATTERS            
Grant funds awarded annually         $ 19,700  
Enhanced Alternative Connect America Cost Model            
GOVERNMENT SUPPORT AND SPECTRUM MATTERS            
Amount that has been funded or will be funded   105,000 $ 105,000      
Grant fund term     14 years      
Enhanced Alternative Connect America Cost Model | Grant receivable through 2030            
GOVERNMENT SUPPORT AND SPECTRUM MATTERS            
Amount that has been funded or will be funded   9,000 $ 9,000      
Enhanced Alternative Connect America Cost Model | Grant receivable in year 2038            
GOVERNMENT SUPPORT AND SPECTRUM MATTERS            
Amount that has been funded or will be funded   6,000 6,000      
High cost support program | Communication services | International Telecom            
GOVERNMENT SUPPORT AND SPECTRUM MATTERS            
Government capital programs - Amounts received     $ 5,500      
Rural Digital Opportunity Fund Phase I            
GOVERNMENT SUPPORT AND SPECTRUM MATTERS            
Grant fund term     10 years      
Term to deploy voice and broadband service to covered areas     6 years      
Grant funds awarded annually     $ 2,300      
Transfer of annual awards     1,300      
Return of grants to FCC     700      
Loss on disposition of assets and transfers   $ 1,900        
Government Assistance, Operating Expense, Decrease (Increase), Statement of Income or Comprehensive Income [Extensible Enumeration]   Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property        
Accounts payable and accrued liabilities   $ 5,100 5,100      
TBCP and Reconnect            
GOVERNMENT SUPPORT AND SPECTRUM MATTERS            
Government capital programs - Amounts received     23,500      
Grant funds awarded during the period     239,000      
Spent construction obligations     25,400      
Replace and Remove Program            
GOVERNMENT SUPPORT AND SPECTRUM MATTERS            
Cost reimbursement amount funded $ 517,000          
Amounts accrued for reimbursable capital expenditures from government capital programs     $ 17,000      
Reimbursement period     12 months      
Replace and Remove Program | Maximum            
GOVERNMENT SUPPORT AND SPECTRUM MATTERS            
Amount of cost reimbursement allocated           $ 207,000