BUSINESS DESCRIPTION & SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Searchlight Investment (Details) - Investment Agreement - Searchlight $ in Millions		12 Months Ended
	Sep. 13, 2020 USD ($) item	Dec. 31, 2021 item	Dec. 31, 2020 USD ($)
Schedule of Investments [Line Items]
Capital commitment | $			$ 75.0
Percentage of company stock on as converted basis		35.00%
Upgrade period	5 years
Number of passings across select service areas | item	1,600,000
Number of homes and small businesses upgraded | item		330,000
Subordinated Debt | Maximum
Schedule of Investments [Line Items]
Capital commitment | $	$ 425.0