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LONG-TERM DEBT - Debt Maturity (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Debt Instrument [Line Items]    
Book Value $ 541,291 $ 516,870
Total Debt    
Debt Instrument [Line Items]    
April 1, 2024 through December 31, 2024 15,987  
Year ending December 31, 2025 19,844  
Year ending December 31, 2026 321,594  
Year ending December 31, 2027 13,473  
Year ending December 31, 2028 13,608  
Thereafter 164,449  
Total 548,955  
Debt Discounts (7,664)  
Book Value 541,291  
Customer receivable credit facility    
Debt Instrument [Line Items]    
April 1, 2024 through December 31, 2024 5,644  
Year ending December 31, 2025 7,830  
Year ending December 31, 2026 8,192  
Year ending December 31, 2027 8,572  
Year ending December 31, 2028 8,973  
Thereafter 9,221  
Total 48,432  
Debt Discounts (455)  
Book Value 47,977  
Corporate and Other    
Debt Instrument [Line Items]    
April 1, 2024 through December 31, 2024 2,438  
Year ending December 31, 2025 4,875  
Year ending December 31, 2026 8,125  
Year ending December 31, 2027 9,750  
Year ending December 31, 2028 9,750  
Thereafter 154,257  
Total 189,195  
Debt Discounts (3,676)  
Book Value 185,519 159,009
US Telecom | Operating segments    
Debt Instrument [Line Items]    
Book Value 295,996 293,607
US Telecom | Operating segments | Total Debt    
Debt Instrument [Line Items]    
April 1, 2024 through December 31, 2024 13,549  
Year ending December 31, 2025 14,969  
Year ending December 31, 2026 253,469  
Year ending December 31, 2027 3,723  
Year ending December 31, 2028 3,858  
Thereafter 10,192  
Total 299,760  
Debt Discounts (3,764)  
Book Value 295,996  
International Telecom | Operating segments    
Debt Instrument [Line Items]    
Book Value 59,776 $ 64,254
International Telecom | Operating segments | Total Debt    
Debt Instrument [Line Items]    
Year ending December 31, 2026 60,000  
Total 60,000  
Debt Discounts (224)  
Book Value $ 59,776