GOVERNMENT SUPPORT AND SPECTRUM MATTERS (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($) item	Sep. 30, 2022 USD ($)	Apr. 30, 2023 USD ($)	Dec. 31, 2022 USD ($)	Jul. 31, 2022 USD ($)	Jul. 15, 2022 USD ($)	Jul. 31, 2021 USD ($)	Jun. 30, 2021 USD ($)
Mobility Fund [Line Items]
Revenue from contract with customer	$ 177,979	$ 171,445	$ 523,975	$ 497,906
Reimbursable capital expenditures			14,261	4,015
Amounts accrued for reimbursable capital expenditures from government capital programs			25,244
Government capital programs - Amounts received			16,065	2,668
USF, CAF II, RDOF and Other Programs | Communication services
Mobility Fund [Line Items]
Revenue from contract with customer	25,930	18,029	78,324	51,461
USF, CAF II, RDOF and Other Programs | US Telecom | Communication services
Mobility Fund [Line Items]
Revenue from contract with customer	24,528	17,086	74,118	44,959
USF, CAF II, RDOF and Other Programs | International Telecom | Communication services
Mobility Fund [Line Items]
Revenue from contract with customer	1,402	943	$ 4,206	6,502
Universal Service Fund programs
Mobility Fund [Line Items]
Number Of Fund Disbursement Programs | item			4
High cost support program | Communication services
Mobility Fund [Line Items]
Revenue from contract with customer	3,685	1,934	$ 11,196	9,501
High cost support program | US Telecom | Communication services
Mobility Fund [Line Items]
Revenue from contract with customer	2,288	991	7,004	3,036
High cost support program | International Telecom | Communication services
Mobility Fund [Line Items]
Revenue from contract with customer	1,397	943	4,192	6,465
CAF II | Grant receivable through December 2025
Mobility Fund [Line Items]
Amount that has been funded or will be funded	27,700		27,700
CAF II | Grant receivable from January 2026 through July 2028
Mobility Fund [Line Items]
Amount that has been funded or will be funded	8,000		8,000
CAF II | Communication services
Mobility Fund [Line Items]
Revenue from contract with customer	6,815	6,822	20,445	20,466
CAF II | US Telecom | Communication services
Mobility Fund [Line Items]
Revenue from contract with customer	6,815	6,822	20,445	20,466
TBCP and Reconnect
Mobility Fund [Line Items]
Grant funds awarded during the period			188,600
Vija's annual USF support
Mobility Fund [Line Items]
Amount that has been funded or will be funded									$ 10,900	$ 16,400
Vija's annual USF support | Grant Receivable July 2022 Through June 2023
Mobility Fund [Line Items]
Amount that has been funded or will be funded							$ 5,500
Vija's annual USF support | Grant Receivable July 2023 Through December 2025
Mobility Fund [Line Items]
Amount that has been funded or will be funded					$ 5,500
RDOF
Mobility Fund [Line Items]
Grant Funds Expected To Be Awarded	22,700		$ 22,700
Grant Fund Term			10 years
Number Of Households To Receive Broadband Coverage | item			10,000
RDOF | Communication services
Mobility Fund [Line Items]
Revenue from contract with customer	608	478	$ 1,824	1,434
RDOF | US Telecom | Communication services
Mobility Fund [Line Items]
Revenue from contract with customer	608	478	1,824	1,434
Other Programs | Communication services
Mobility Fund [Line Items]
Revenue from contract with customer	14,822	8,795	44,859	20,060
Other Programs | US Telecom | Communication services
Mobility Fund [Line Items]
Revenue from contract with customer	14,817	$ 8,795	44,845	20,023
Other Programs | International Telecom | Communication services
Mobility Fund [Line Items]
Revenue from contract with customer	5		14	37
Remove And Replace Program
Mobility Fund [Line Items]
Reimbursable capital expenditures			27,100	$ 1,600
Receivable for costs expected to be reimbursed	36,600		$ 36,600
Reimbursement period			12 months
Amounts accrued for reimbursable capital expenditures from government capital programs			$ 25,300
Proceeds from grant funds awarded			2,600
Proceeds from grant funds awarded classified as operating cash inflows			1,100
Proceeds from grant funds awarded classified as investing cash inflows			1,500
Remove And Replace Program | Maximum
Mobility Fund [Line Items]
Amount of cost reimbursement allocated								$ 207,000
Network Connectivity for Eligible Communities
Mobility Fund [Line Items]
Reimbursable capital expenditures			12,400
Cumulative Grant Fund Awards	$ 101,024		101,024			$ 80,197
Grant funds awarded during the period			34,821
Government capital programs - Amounts received			$ 14,600