LONG-TERM DEBT (Details)						1 Months Ended	3 Months Ended
	Jul. 13, 2023 USD ($)	Dec. 23, 2022 USD ($)	Jun. 15, 2022 USD ($)	Jul. 22, 2021 USD ($)	Apr. 10, 2019 USD ($)	Oct. 31, 2023 USD ($)	Mar. 31, 2024 USD ($)	Mar. 31, 2023 USD ($)	Dec. 31, 2023 USD ($)	Nov. 30, 2023 USD ($) derivative	Nov. 07, 2022 USD ($)	Oct. 12, 2022 USD ($)	May 05, 2022	Mar. 26, 2020 USD ($)	Dec. 31, 2016 USD ($)	Jul. 01, 2016 USD ($)
Long-term debt
Revolving credit facility - borrowings							$ 46,000,000	$ 57,553,000
Outstanding borrowings							541,291,000		$ 516,870,000
Current portion of long-term debt							20,476,000		24,290,000
Long-term debt, excluding current portion							520,815,000		492,580,000
Current portion of customer receivable credit facility							7,569,000		$ 7,110,000
Alaska communications | Interest rate swap | Designated as cash flow hedges
Long-term debt
Interest rate (in percent)				1.6735%
Alaska credit facility | Period of second quarter of 2024
Long-term debt
Net total leverage ratio				3.75
Alaska credit facility | Interest rate swap
Long-term debt
Number of derivative instruments | derivative										2
Alaska credit facility | Alaska communications
Long-term debt
Financing costs							7,300,000
Unamortized financing costs							$ 3,500,000
Consolidated EBITDA				12 months
Net total leverage ratio				4.00
Fixed charge coverage ratio				1.25
Alaska credit facility | Alaska communications | Period of fourth quarter of 2023 To third quarter 2024
Long-term debt
Periodic payment, principal				$ 1,400,000
Alaska credit facility | Alaska communications | Debt Instrument, From Fourth Quarter of 2024 To Third Quarter of 2026
Long-term debt
Periodic payment, principal				$ 2,900,000
Alaska credit facility | SOFR
Long-term debt
Basis spread on variable rate (as a percent)		0.10%
Alaska credit facility | SOFR | Interest rate swap
Long-term debt
Notional amount										$ 200,000,000.0
Alaska credit facility | SOFR | Interest rate swap One
Long-term debt
Interest rate (in percent)										4.8695%
Alaska credit facility | SOFR | Interest rate swap Two
Long-term debt
Interest rate (in percent)										4.898%
Alaska credit facility | SOFR | Alaska communications
Long-term debt
Basis spread on variable rate (as a percent)				0.10%
Alaska credit facility | Base rate | Alaska communications
Long-term debt
Basis spread on variable rate (as a percent)				1.00%
Alaska credit facility | Minimum | SOFR | Alaska communications
Long-term debt
Basis spread on variable rate (as a percent)				3.00%
Alaska credit facility | Maximum | SOFR | Alaska communications
Long-term debt
Basis spread on variable rate (as a percent)				4.00%
GTT Credit Facility
Long-term debt
Term of debt							5 years
Borrowings outstanding							$ 0
Fixed interest rate							7.50%
GTT Term Loan Facility
Long-term debt
Maximum borrowing capacity												$ 2,900,000
GTT Overdraft Facility
Long-term debt
Maximum borrowing capacity												$ 5,700,000
Viya Debt
Long-term debt
Net leverage ratio													7.0			3.5
Financing costs															$ 900,000
Unamortized financing costs							$ 200,000
Term loan assumed																$ 60,000,000.0
Fixed interest rate															4.00%	4.00%
Outstanding debt							60,000,000.0
Revolver loan | 2019 CoBank Credit Facility
Long-term debt
Maximum borrowing capacity					$ 200,000,000
Repayments of debt	$ 139,500,000
Revolver loan | 2019 CoBank Credit Facility | Minimum
Long-term debt
Commitment fee (as a percent)					0.15%
Revolver loan | 2019 CoBank Credit Facility | Minimum | Base rate
Long-term debt
Basis spread on variable rate (as a percent)					0.25%
Revolver loan | 2019 CoBank Credit Facility | Minimum | LIBOR
Long-term debt
Basis spread on variable rate (as a percent)					1.25%
Revolver loan | 2019 CoBank Credit Facility | Maximum
Long-term debt
Commitment fee (as a percent)					0.375%
Revolver loan | 2019 CoBank Credit Facility | Maximum | Base rate
Long-term debt
Basis spread on variable rate (as a percent)					1.25%
Revolver loan | 2019 CoBank Credit Facility | Maximum | LIBOR
Long-term debt
Basis spread on variable rate (as a percent)					2.25%
Revolver loan | Alaska credit facility | Alaska communications
Long-term debt
Maximum borrowing capacity		$ 75,000,000.0		$ 35,000,000.0
Revolving credit facility - borrowings							40,000,000.0
Borrowings outstanding							227,100,000
Remaining borrowing capacity							35,000,000.0
Letter of credit sub-facility
Long-term debt
Borrowings outstanding							32,400,000
Letter of credit sub-facility | 2023 CoBank Credit Facility
Long-term debt
Maximum borrowing capacity	25,000,000
Letter of credit sub-facility | 2019 CoBank Credit Facility
Long-term debt
Maximum borrowing capacity					$ 75,000,000
Swingline sub-facility | 2023 CoBank Credit Facility
Long-term debt
Maximum borrowing capacity	$ 20,000,000
Base rate before one-week or one-month LIBOR (as a percent)	1.00%
Swingline sub-facility | 2023 CoBank Credit Facility | Federal Funds Effective Rate
Long-term debt
Basis spread on variable rate (as a percent)	0.50%
Swingline sub-facility | 2019 CoBank Credit Facility
Long-term debt
Maximum borrowing capacity					$ 10,000,000
Base rate before one-week or one-month LIBOR (as a percent)					1.00%
Swingline sub-facility | 2019 CoBank Credit Facility | Federal Funds Effective Rate
Long-term debt
Basis spread on variable rate (as a percent)					0.50%
Term loans | Alaska credit facility | Alaska communications
Long-term debt
Outstanding borrowings		$ 230,000,000.0		210,000,000.0
2023 CoBank Credit Facility
Long-term debt
Financing costs							4,200,000
Unamortized financing costs							3,700,000
2023 CoBank Credit Facility | 2023 CoBank Credit Facility | Interest rate swap
Long-term debt
Derivative, Term of debt						2 years
Notional amount						$ 50,000,000.0
2023 CoBank Credit Facility | 2023 CoBank Credit Facility | SOFR | Interest rate swap
Long-term debt
Interest rate (in percent)						4.896%
2023 CoBank Credit Facility | 2023 CoBank Credit Facility | Minimum
Long-term debt
Commitment fee (as a percent)	0.25%
2023 CoBank Credit Facility | 2023 CoBank Credit Facility | Maximum
Long-term debt
Commitment fee (as a percent)	0.50%
2023 CoBank Revolving Loan | 2023 CoBank Credit Facility
Long-term debt
Term of debt	5 years
Maximum borrowing capacity	$ 170,000,000
Revolving credit facility - borrowings	$ 13,600,000
Borrowings outstanding							60,800,000
Remaining borrowing capacity							109,200,000
2023 CoBank Revolving Loan | 2023 CoBank Credit Facility | Minimum | SOFR
Long-term debt
Basis spread on variable rate (as a percent)	1.75%
2023 CoBank Revolving Loan | 2023 CoBank Credit Facility | Minimum | Base rate
Long-term debt
Basis spread on variable rate (as a percent)	0.75%
2023 CoBank Revolving Loan | 2023 CoBank Credit Facility | Maximum
Long-term debt
Net leverage ratio	3.25
2023 CoBank Revolving Loan | 2023 CoBank Credit Facility | Maximum | SOFR
Long-term debt
Basis spread on variable rate (as a percent)	3.50%
2023 CoBank Revolving Loan | 2023 CoBank Credit Facility | Maximum | Base rate
Long-term debt
Basis spread on variable rate (as a percent)	2.50%
2023 CoBank Term Loan | 2023 CoBank Credit Facility
Long-term debt
Term of debt	6 years
Face amount of debt	$ 130,000,000
Borrowings outstanding							128,400,000
2023 CoBank Term Loan | 2023 CoBank Credit Facility | Minimum | SOFR
Long-term debt
Basis spread on variable rate (as a percent)	2.00%
2023 CoBank Term Loan | 2023 CoBank Credit Facility | Minimum | Base rate
Long-term debt
Basis spread on variable rate (as a percent)	1.00%
2023 CoBank Term Loan | 2023 CoBank Credit Facility | Maximum | SOFR
Long-term debt
Basis spread on variable rate (as a percent)	3.75%
2023 CoBank Term Loan | 2023 CoBank Credit Facility | Maximum | Base rate
Long-term debt
Basis spread on variable rate (as a percent)	2.75%
Incremental term loans | Alaska credit facility | Minimum | Alaska communications
Long-term debt
Maximum borrowing capacity				$ 70,000,000.0
Secured delayed draw term loan | Alaska Term Facility | Alaska communications
Long-term debt
Remaining borrowing capacity							0
Outstanding borrowings							5,300,000
Fixed charge coverage ratio			4.0
Maximum borrowing capacity			$ 7,500,000
Senior secured delayed draw term loan | Receivable credit facility
Long-term debt
Maximum borrowing capacity														$ 75,000,000.0
Financing costs														$ 800,000
Unamortized financing costs							500,000
Borrowings outstanding							48,400,000
Remaining borrowing capacity							11,300,000
Current portion of customer receivable credit facility							7,600,000
Senior secured delayed draw term loan | Sacred Wind Term Debt
Long-term debt
Outstanding borrowings							27,400,000				$ 31,600,000
Current portion of long-term debt							3,300,000
Long-term debt, excluding current portion							$ 24,100,000
Senior secured delayed draw term loan | Sacred Wind Term Debt | Minimum
Long-term debt
Fixed interest rate							0.88%
Senior secured delayed draw term loan | Sacred Wind Term Debt | Maximum
Long-term debt
Fixed interest rate							5.00%