ACQUISITIONS AND DISPOSITIONS - Acquisition of Alaska Communications (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
	Jul. 22, 2021	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Jun. 30, 2022	Dec. 31, 2021
Business Acquisition [Line Items]
Cash and restricted cash acquired					$ 11,900
Redeemable noncontrolling interests		$ 76,398	$ 71,820	$ 76,398	71,820	$ 75,206	$ 72,936
Contingent consideration paid for business acquisition				1,718
Amount drawn from revolving credit facility				12,225	27,540
Revenue		182,213	166,760	533,730	415,135
Income (Loss) from Continuing Operations before Income Taxes		(2,132)	(4,763)	(6,415)	1,554
Transaction-related charges		3,416	5,696	4,381	7,823
Redeemable Common Units
Business Acquisition [Line Items]
Redeemable noncontrolling interests		22,640	22,640	22,640	22,640	22,640	22,640
Redeemable Preferred Units
Business Acquisition [Line Items]
Redeemable noncontrolling interests		53,758	$ 49,180	53,758	$ 49,180	$ 52,566	$ 50,296
Alaska communications
Business Acquisition [Line Items]
Consideration Transferred	$ 353,280
Cash consideration	339,500
Cash and restricted cash acquired	$ 11,900
Percentage of additional equity interest	3.00%
Original issue price				48,300
Accrued preferred dividend		5,500		5,500
Accrued consideration	$ 1,900
Contingent consideration paid for business acquisition				1,700
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	$ 81,500
Revenue		63,500		184,400
Income (Loss) from Continuing Operations before Income Taxes		3,200		8,300
Transaction-related charges	11,200			800
Alaska communications | Warrant for redeemable common unit
Business Acquisition [Line Items]
Warrants value	600	600		600
Alaska communications | Customer relationships
Business Acquisition [Line Items]
Intangible assets	$ 34,900
Alaska communications | Customer relationships | Minimum
Business Acquisition [Line Items]
Intangible assets useful lives	5 years
Alaska communications | Customer relationships | Maximum
Business Acquisition [Line Items]
Intangible assets useful lives	15 years
Alaska communications | Trade name licenses
Business Acquisition [Line Items]
Intangible assets	$ 9,500
Alaska communications | Trade name licenses | Minimum
Business Acquisition [Line Items]
Intangible assets useful lives	5 years
Alaska communications | Trade name licenses | Maximum
Business Acquisition [Line Items]
Intangible assets useful lives	15 years
Alaska communications | Telecommunication Equipment | Minimum
Business Acquisition [Line Items]
Discounted rate used for cash flows (as a percent)	4.00%
Useful life	2 years
Alaska communications | Telecommunication Equipment | Maximum
Business Acquisition [Line Items]
Discounted rate used for cash flows (as a percent)	14.00%
Useful life	30 years
Alaska communications | Redeemable Common Units
Business Acquisition [Line Items]
Redeemable noncontrolling interests	$ 22,600	22,600		22,600
Fair value of units		22,600		22,600
Alaska communications | Redeemable Preferred Units
Business Acquisition [Line Items]
Redeemable noncontrolling interests	$ 48,300	48,300		48,300
Fair value of units		$ 53,800		$ 53,800
Percentage of preferred dividend	9.00%	9.00%
Alaska credit facility | Alaska communications
Business Acquisition [Line Items]
Principal amount	$ 283,000
Debt issuance and debt discount costs	6,600
Alaska Term Loan | Alaska communications
Business Acquisition [Line Items]
Principal amount	210,000
Alaska revolving facility | Alaska communications
Business Acquisition [Line Items]
Debt issuance and debt discount costs	10,000
Amount drawn from revolving credit facility	$ 63,000