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EQUITY INVESTMENTS - Carrying Value of Equity Method Investments Without Determinable Fair Values (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022	Sep. 06, 2022	Nov. 12, 2020
Net Investment Income [Line Items]
Total cost method investments	$ 193,576	$ 181,067
Total equity method investments	997,641	1,014,154
Total equity investments	1,191,217	1,195,221
MBI Net Option	172,330	164,350
MBI
Net Investment Income [Line Items]
MBI Net Option	$ 172,300	164,400
MetroNet
Net Investment Income [Line Items]
Cost method investment, ownership percentage (in percent)	10.00%
Total cost method investments	$ 7,000	7,000
Nextlink
Net Investment Income [Line Items]
Cost method investment, ownership percentage (in percent)	20.00%
Total cost method investments	$ 77,245	77,245
Point Broadband
Net Investment Income [Line Items]
Cost method investment, ownership percentage (in percent)	10.00%
Total cost method investments	$ 42,623	30,373
Tristar
Net Investment Income [Line Items]
Cost method investment, ownership percentage (in percent)	10.00%
Total cost method investments	$ 23,995	23,413
Visionary
Net Investment Income [Line Items]
Cost method investment, ownership percentage (in percent)	10.00%
Total cost method investments	$ 7,190	7,190
Ziply
Net Investment Income [Line Items]
Cost method investment, ownership percentage (in percent)	10.00%
Total cost method investments	$ 22,222	22,222
Ziply | Maximum
Net Investment Income [Line Items]
Total cost method investments			$ 50,000
Others
Net Investment Income [Line Items]
Cost method investment, ownership percentage (in percent)	10.00%
Total cost method investments	$ 13,301	13,624
Clearwave Fiber
Net Investment Income [Line Items]
Equity method investment, ownership percentage (in percent)	58.00%
Total equity method investments	$ 395,284	409,514
MBI
Net Investment Income [Line Items]
Equity method investment, ownership percentage (in percent)	45.00%
Total equity method investments	$ 568,672	571,075		$ 630,700
MBI | Call Option
Net Investment Income [Line Items]
Interest rate swap asset				19,700
MBI | Put Option
Net Investment Income [Line Items]
MBI Net Option				$ 75,500
Wisper
Net Investment Income [Line Items]
Equity method investment, ownership percentage (in percent)	40.40%
Total equity method investments	$ 33,685	$ 33,565

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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