LONG-TERM DEBT - Debt Maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Book Value	$ 516,870	$ 421,900
Total Debt
Debt Instrument [Line Items]
2024	24,290
2025	19,844
2026	316,594
2027	13,473
2028	140,665
Thereafter	10,191
Total	525,057
Debt Discounts	(8,187)
Book Value	516,870
Customer receivable credit facility
Debt Instrument [Line Items]
2024	7,110
2025	7,428
2026	7,761
2027	8,111
2028	8,478
Thereafter	7,650
Total	46,538
Debt Discounts	(485)
Book Value	46,053
Corporate and Other
Debt Instrument [Line Items]
2024	3,250
2025	4,875
2026	8,125
2027	9,750
2028	136,807
Total	162,807
Debt Discounts	(3,798)
Book Value	159,009	99,000
US Telecom | Operating segments
Debt Instrument [Line Items]
Book Value	293,607	263,241
US Telecom | Operating segments | Total Debt
Debt Instrument [Line Items]
2024	16,538
2025	14,969
2026	248,469
2027	3,723
2028	3,858
Thereafter	10,191
Total	297,748
Debt Discounts	(4,142)
Book Value	293,606
International Telecom | Operating segments
Debt Instrument [Line Items]
Book Value	64,254	$ 59,659
International Telecom | Operating segments | Total Debt
Debt Instrument [Line Items]
2024	4,502
2026	60,000
Total	64,502
Debt Discounts	(247)
Book Value	$ 64,255