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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 |  |  |

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