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GOVERNMENT SUPPORT AND SPECTRUM MATTERS (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2024 USD ($) item	Sep. 30, 2023 USD ($)	Jul. 15, 2022 USD ($)
Mobility Fund [Line Items]
Revenue from contract with customer	$ 164,602	$ 177,979	$ 506,876	$ 523,975
Reimbursable capital expenditures			71,849	14,261
Amounts accrued for reimbursable capital expenditures from government capital programs			32,467	25,244
Gain (loss) on disposition of long-lived assets	(1,504)	(132)	14,919	(410)
Government capital programs - Amounts received			72,531	16,065
USF, CAF II, RDOF, EOF, RHC and Other Programs | Communication services
Mobility Fund [Line Items]
Revenue from contract with customer	18,104	25,930	64,999	78,324
USF, CAF II, RDOF, EOF, RHC and Other Programs | US Telecom | Communication services
Mobility Fund [Line Items]
Revenue from contract with customer	16,707	24,528	60,346	74,118
USF, CAF II, RDOF, EOF, RHC and Other Programs | International Telecom | Communication services
Mobility Fund [Line Items]
Revenue from contract with customer	1,397	1,402	$ 4,653	4,206
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	4,867	3,685	$ 14,591	11,196
High cost support program | US Telecom | Communication services
Mobility Fund [Line Items]
Revenue from contract with customer	3,473	2,288	10,411	7,004
High cost support program | International Telecom | Communication services
Mobility Fund [Line Items]
Revenue from contract with customer	1,394	1,397	4,180	4,192
Government capital programs - Amounts received			5,500
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	6,731	6,815	20,303	20,445
CAF II | US Telecom | Communication services
Mobility Fund [Line Items]
Revenue from contract with customer	6,731	6,815	20,303	20,445
E-ACAM
Mobility Fund [Line Items]
Amount that has been funded or will be funded	118,200		$ 118,200
Grant fund term			15 years
E-ACAM | Grant receivable from 2024 through 2030
Mobility Fund [Line Items]
Amount that has been funded or will be funded	9,000		$ 9,000
E-ACAM | Grant receivable in year 2038
Mobility Fund [Line Items]
Amount that has been funded or will be funded	6,000		6,000
TBCP and Reconnect
Mobility Fund [Line Items]
Grant funds awarded during the period			192,600
Government capital programs - Amounts received			15,900
Construction Obligation			16,100
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
Transfer of obligation under pending approval of regulatory	13,000		$ 13,000
Gain (loss) on disposition of long-lived assets	900
Accounts payable and accrued liabilities	2,000		2,000
RDOF | Communication services
Mobility Fund [Line Items]
Revenue from contract with customer	175	608	465	1,824
RDOF | US Telecom | Communication services
Mobility Fund [Line Items]
Revenue from contract with customer	175	608	465	1,824
ECF | Communication services
Mobility Fund [Line Items]
Revenue from contract with customer		6,813	7,312	21,694
ECF | US Telecom | Communication services
Mobility Fund [Line Items]
Revenue from contract with customer		6,813	7,312	21,694
RHC | Communication services
Mobility Fund [Line Items]
Revenue from contract with customer	4,420	3,007	11,539	8,795
RHC | US Telecom | Communication services
Mobility Fund [Line Items]
Revenue from contract with customer	4,420	3,007	11,539	8,795
Other Programs | Communication services
Mobility Fund [Line Items]
Revenue from contract with customer	1,911	5,002	10,789	14,370
Other Programs | US Telecom | Communication services
Mobility Fund [Line Items]
Revenue from contract with customer	1,908	4,997	10,316	14,356
Other Programs | International Telecom | Communication services
Mobility Fund [Line Items]
Revenue from contract with customer	$ 3	$ 5	$ 473	$ 14
Remove And Replace Program
Mobility Fund [Line Items]
Reimbursement period			12 months
Amounts accrued for reimbursable capital expenditures from government capital programs			$ 31,100
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			4,700
Grant funds awarded during the period			0
Government capital programs - Amounts received			$ 4,100

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