GOVERNMENT SUPPORT AND SPECTRUM MATTERS (Details) $ in Thousands	1 Months Ended	3 Months Ended				6 Months Ended		12 Months Ended
	Jul. 31, 2022 USD ($)	Sep. 30, 2022 USD ($)	Jun. 30, 2022 USD ($)	Jun. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Jun. 30, 2022 USD ($) item	Jun. 30, 2021 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($) item	Jul. 15, 2022 USD ($)	Jul. 31, 2021 USD ($)
Mobility Fund [Line Items]
Total			$ 179,497	$ 123,865		$ 351,517	$ 248,375
Communication services
Mobility Fund [Line Items]
Total			171,795	112,964		338,338	223,599
USF, CAF II, RDOF and Other Programs | Communication services
Mobility Fund [Line Items]
Total			17,239	8,292		33,432	16,724
USF, CAF II, RDOF and Other Programs | US Telecom | Communication services
Mobility Fund [Line Items]
Total			14,456	3,987		27,873	8,314
USF, CAF II, RDOF and Other Programs | International Telecom | Communication services
Mobility Fund [Line Items]
Total			2,783	4,305		$ 5,559	8,410
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			3,750	4,606		$ 7,567	9,007
High cost support program | US Telecom | Communication services
Mobility Fund [Line Items]
Revenue not from contract with customer			989	311		2,045	622
High cost support program | International Telecom | Communication services
Mobility Fund [Line Items]
Revenue not from contract with customer			2,761	4,295		5,522	8,385
CAF II | Grant receivable through December 2025
Mobility Fund [Line Items]
Grants Receivable			27,700			27,700
CAF II | Grant receivable from January 2026 through July 2028
Mobility Fund [Line Items]
Grants Receivable			8,000			8,000
CAF II | Communication services
Mobility Fund [Line Items]
Revenue not from contract with customer			6,822	1,899		13,644	3,798
CAF II | US Telecom | Communication services
Mobility Fund [Line Items]
Revenue not from contract with customer			6,822	1,899		13,644	3,798
Network Connectivity for Eligible Communities
Mobility Fund [Line Items]
Cumulative Grant Fund Awards			26,200			26,200		$ 27,900
Grant funds awarded during the period						400
Grants cancelled						2,100
Construction Obligation Completed						17,100
Construction obligation yet to be completed						9,100
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]
Grants Receivable				16,400			16,400				$ 10,900
Vija's annual USF support | Grant Receivable June 2022 Through June 2023
Mobility Fund [Line Items]
Grants Receivable			5,500			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			956
RDOF | US Telecom | Communication services
Mobility Fund [Line Items]
Revenue from contract with customer			478			956
Other Programs | Communication services
Mobility Fund [Line Items]
Revenue from contract with customer			6,189	1,787		11,265	3,919
Other Programs | US Telecom | Communication services
Mobility Fund [Line Items]
Revenue from contract with customer			6,167	1,777		11,228	3,894
Other Programs | International Telecom | Communication services
Mobility Fund [Line Items]
Revenue from contract with customer			$ 22	$ 10		$ 37	$ 25
Fiber connectivity to certain areas within southern Apache County, Arizona
Mobility Fund [Line Items]
Grant funds awarded during the period	$ 10,000
Remove And Replace Program | Maximum
Mobility Fund [Line Items]
Amount of cost reimbursement allocated										$ 207,000