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GOVERNMENT SUPPORT AND SPECTRUM MATTERS (Details) - USD ($)
$ in Thousands
 1 Months Ended 12 Months Ended
Dec. 31, 2024
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Jul. 31, 2022
Mobility Fund [Line Items]          
Revenue from contract with customer   $ 673,997 $ 709,880 $ 677,953  
Gain (loss) on disposition of long-lived assets   13,251 (1,699) (4,389)  
Government capital programs - Amounts received   95,758 31,873 2,853  
USF, CAF II, RDOF, ECF, RHC and Other Programs | Communication services          
Mobility Fund [Line Items]          
Revenue from contract with customer   81,960 107,592 68,247  
USF, CAF II, RDOF, ECF, RHC and Other Programs | US Telecom | Communication services          
Mobility Fund [Line Items]          
Revenue from contract with customer   75,909 100,771 60,333  
USF, CAF II, RDOF, ECF, RHC and Other Programs | International Telecom | Communication services          
Mobility Fund [Line Items]          
Revenue from contract with customer   6,051 6,821 7,914  
Universal Service Fund programs          
Mobility Fund [Line Items]          
Proceeds from grant funds awarded   2,500      
High cost support program | Communication services          
Mobility Fund [Line Items]          
Revenue from contract with customer   19,422 14,831 12,321  
High cost support program | US Telecom | Communication services          
Mobility Fund [Line Items]          
Revenue from contract with customer   13,848 9,260 4,459  
High cost support program | International Telecom | Communication services          
Mobility Fund [Line Items]          
Revenue from contract with customer   5,574 5,571 7,862  
Government capital programs - Amounts received   5,500      
CAF II          
Mobility Fund [Line Items]          
Proceeds from grant funds replaced amount $ 19,700 19,700      
Grant received per year   8,000      
CAF II | Communication services          
Mobility Fund [Line Items]          
Revenue from contract with customer   26,984 27,260 27,264  
CAF II | US Telecom | Communication services          
Mobility Fund [Line Items]          
Revenue from contract with customer   26,984 27,260 27,264  
E-ACAM          
Mobility Fund [Line Items]          
Amount that has been funded or will be funded 109,000 $ 109,000      
Grant fund term   14 years      
E-ACAM | Grant receivable in year 2038          
Mobility Fund [Line Items]          
Amount that has been funded or will be funded 6,000 $ 6,000      
E-ACAM | Grant Receivable In Initial 6 Years          
Mobility Fund [Line Items]          
Amount that has been funded or will be funded 9,000 9,000      
TBCP          
Mobility Fund [Line Items]          
Grant funds awarded during the period   178,300      
TBCP and Reconnect          
Mobility Fund [Line Items]          
Grant funds received and spent 19,700 19,700      
RDOF          
Mobility Fund [Line Items]          
Grant funds awarded annually   $ 2,300      
Maximum grant fund term   6 years      
Transfer of annual awards 1,300 $ 1,300      
Grant fund term   10 years      
Return of grants to FCC 300 $ 300      
Gain (loss) on disposition of long-lived assets   (2,500)      
Accounts payable and accrued liabilities 4,600 4,600      
RDOF | Communication services          
Mobility Fund [Line Items]          
Revenue from contract with customer   300 2,432 1,954  
RDOF | US Telecom | Communication services          
Mobility Fund [Line Items]          
Revenue from contract with customer   300 2,432 1,954  
ECF | Communication services          
Mobility Fund [Line Items]          
Revenue from contract with customer   6,883 26,346    
ECF | US Telecom | Communication services          
Mobility Fund [Line Items]          
Revenue from contract with customer   6,883 26,346    
RHC | Communication services          
Mobility Fund [Line Items]          
Revenue from contract with customer   15,927 11,995 11,018  
RHC | US Telecom | Communication services          
Mobility Fund [Line Items]          
Revenue from contract with customer   15,927 11,995 11,018  
Other Programs | Communication services          
Mobility Fund [Line Items]          
Revenue from contract with customer   12,444 24,728 15,690  
Other Programs | US Telecom | Communication services          
Mobility Fund [Line Items]          
Revenue from contract with customer   11,967 23,478 15,638  
Other Programs | International Telecom | Communication services          
Mobility Fund [Line Items]          
Revenue from contract with customer   477 1,250 $ 52  
Remove And Replace Program          
Mobility Fund [Line Items]          
Amount that has been funded or will be funded 37,700 37,700 $ 47,300    
Cost reimbursement amount funded 517,000        
Remove And Replace Program | Maximum          
Mobility Fund [Line Items]          
Amount of cost reimbursement allocated         $ 207,000
Alaska Connect Fund [Member] | Grant receivable from January 1, 2025 through December 2028          
Mobility Fund [Line Items]          
Grants expected to be received per year $ 25,600 $ 25,600