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ACQUISITIONS AND DISPOSITIONS - Acquisition of Alaska Communications (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended		9 Months Ended
	Jul. 22, 2021	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Jun. 30, 2021	Dec. 31, 2020	Jun. 30, 2020	Dec. 31, 2019
Business Acquisition [Line Items]
Cash and restricted cash acquired				$ 11,900
Redeemable noncontrolling interests		$ 71,820	$ 0	71,820	$ 0	$ 0	$ 0	$ 0	$ 0
Amount drawn from revolving credit facility				27,540
Revenue		166,760	111,739	415,135	331,743
Income (Loss) from Continuing Operations before Income Taxes		(4,763)	6,283	1,554	15,874
Transaction-related charges		5,696	31	7,823	147
Redeemable Common Units
Business Acquisition [Line Items]
Redeemable noncontrolling interests		22,640	0	22,640	0	0	0	0	0
Redeemable Preferred Units
Business Acquisition [Line Items]
Redeemable noncontrolling interests		49,180	$ 0	49,180	$ 0	$ 0	$ 0	$ 0	$ 0
Alaska communications
Business Acquisition [Line Items]
Price of common share	$ 3.40
Consideration Transferred	$ 353,280
Cash consideration	339,500
Cash and restricted cash acquired	$ 11,900
Percentage of additional equity interest	3.00%
Unpaid preferred dividend	$ 800	800		800
Accrued consideration	1,900
Payment for purchase of Alaska Communications equity	186,800
Repayment of Alaska Communications debt	164,600
Mezzanine equity contribution received from Freedom 3 Investors	$ 71,500
Percentage of voting interest	52.00%
Deferred revenue from long term customer contracts	$ 74,600
Revenue		46,800		46,800
Income (Loss) from Continuing Operations before Income Taxes		3,800		3,800
Transaction-related charges	8,100	5,700		7,300
Alaska communications | Warrant for redeemable common unit
Business Acquisition [Line Items]
Warrants value		$ 600		$ 600
Alaska communications | Customer relationships | Minimum
Business Acquisition [Line Items]
Intangible assets	$ 40,700
Intangible assets useful lives	6 years
Alaska communications | Trade names | Maximum
Business Acquisition [Line Items]
Intangible assets	$ 9,500
Intangible assets useful lives	16 years
Alaska communications | Telecommunication Equipment | Minimum
Business Acquisition [Line Items]
Useful life	2 years
Alaska communications | Telecommunication Equipment | Maximum
Business Acquisition [Line Items]
Useful life	18 years
Alaska communications | Valuation income and cost approach | Telecommunication Equipment | Minimum
Business Acquisition [Line Items]
Discounted rate used for cash flows (as a percent)	6.00%
Alaska communications | Valuation income and cost approach | Telecommunication Equipment | Maximum
Business Acquisition [Line Items]
Discounted rate used for cash flows (as a percent)	14.00%
Alaska communications | Redeemable Common Units
Business Acquisition [Line Items]
Redeemable noncontrolling interests	$ 22,600
Fair value of common units	22,600
Alaska communications | Redeemable Preferred Units
Business Acquisition [Line Items]
Redeemable noncontrolling interests	$ 48,300
Percentage of preferred dividend	9.00%
Alaska credit facility | Alaska communications
Business Acquisition [Line Items]
Principal amount	$ 283,000
Debt issuance and debt discount costs	6,600
Amount drawn from revolving credit facility	220,000
Alaska Term Loan | Alaska communications
Business Acquisition [Line Items]
Principal amount	210,000
Alaska revolving facility | Alaska communications
Business Acquisition [Line Items]
Principal amount	10,000
Amount drawn from revolving credit facility	$ 63,000

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