GOVERNMENT SUPPORT AND SPECTRUM MATTERS (Details) $ in Thousands	1 Months Ended	3 Months Ended			9 Months Ended		12 Months Ended
	Oct. 31, 2022 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2022 USD ($) item	Sep. 30, 2021 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($) item	Jul. 31, 2022 USD ($)	Jul. 15, 2022 USD ($)	Jul. 31, 2021 USD ($)	Jun. 30, 2021 USD ($)
Mobility Fund [Line Items]
Total		$ 182,213	$ 166,760		$ 533,730	$ 415,135
Communication services
Mobility Fund [Line Items]
Total		173,977	155,298		512,315	378,897
USF, CAF II, RDOF and Other Programs | Communication services
Mobility Fund [Line Items]
Total		18,029	13,760		51,461	30,484
USF, CAF II, RDOF and Other Programs | US Telecom | Communication services
Mobility Fund [Line Items]
Total		17,086	10,999		44,959	19,338
USF, CAF II, RDOF and Other Programs | International Telecom | Communication services
Mobility Fund [Line Items]
Total		943	2,761		$ 6,502	11,146
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 not from contract with customer		1,934	3,601		$ 9,501	12,608
High cost support program | US Telecom | Communication services
Mobility Fund [Line Items]
Revenue not from contract with customer		991	840		3,036	1,462
High cost support program | International Telecom | Communication services
Mobility Fund [Line Items]
Revenue not from contract with customer		943	2,761		6,465	11,146
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 not from contract with customer		6,822	5,710		20,466	9,508
CAF II | US Telecom | Communication services
Mobility Fund [Line Items]
Revenue not from contract with customer		6,822	5,710		20,466	9,508
TBCP
Mobility Fund [Line Items]
Additional grant funds awarded	$ 52,300
Grant funds awarded during the period					77,500
CARES Act
Mobility Fund [Line Items]
Cumulative Grant Fund Awards								$ 16,300
Grant funds awarded during the period							$ 2,400
Grant Funds Used to Offset Fixed Asset Related Costs							18,400
Grant Funds Used to Offset Operating Expenses							$ 300
CBRS Auction
Mobility Fund [Line Items]
Initial term of licenses				10 years
Payment for PALs				$ 20,400
Repayment for surrender of licenses		1,100
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 June 2022 Through June 2023
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								$ 20,100
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		478			1,434
RDOF | US Telecom | Communication services
Mobility Fund [Line Items]
Revenue from contract with customer		478			1,434
Other Programs | Communication services
Mobility Fund [Line Items]
Revenue from contract with customer		8,795	4,449		20,060	8,368
Other Programs | US Telecom | Communication services
Mobility Fund [Line Items]
Revenue from contract with customer		8,795	$ 4,449		20,023	$ 8,368
Other Programs | International Telecom | Communication services
Mobility Fund [Line Items]
Revenue from contract with customer					37
Remove And Replace Program
Mobility Fund [Line Items]
Deferred cost expected to be reimbursed		$ 2,100			$ 2,100
Remove And Replace Program | Maximum
Mobility Fund [Line Items]
Amount of cost reimbursement allocated										$ 207,000