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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Restructuring expenses and disposition of assets (Details) - USD ($)
$ in Thousands
12 Months Ended 15 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Mar. 31, 2024
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Restructuring Charges, Total $ 3,535 $ 11,228    
Gain (loss) on disposal of fixed asset 13,300      
Proceeds from sale of assets 18,609   $ 1,067  
Book value of fixed asset 1,040,193 1,080,659    
Disposal | Non-core fixed asset        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Gain (loss) on disposal of fixed asset 15,500      
Proceeds from sale of assets 17,800      
Book value of fixed asset 500      
Transaction costs 1,800      
Corporate and Other        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Restructuring Charges, Total 879      
Book value of fixed asset 7,707 4,915    
2023 Restructuring        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Employee termination benefits       $ 6,641
Contract termination costs       5,777
Restructuring Charges, Total 1,200 11,200   12,418
Restructure costs paid 11,900      
Gain on lease termination 300      
Restructuring costs remain accrued 800      
Right of use assets terminated 5,600      
Lease liabilities terminated 5,900      
2024 Reorganization        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Contract termination costs 2,300      
Restructure costs paid 1,600      
Restructuring costs remain accrued 700      
2024 Reorganization | Corporate and Other        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Contract termination costs 900      
US Telecom        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Gain (loss) on disposal of fixed asset (2,500)      
US Telecom | Operating segments        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Restructuring Charges, Total 1,167 7,737    
Book value of fixed asset 565,625 593,833    
US Telecom | 2023 Restructuring        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Employee termination benefits       1,960
Contract termination costs       5,777
Restructuring Charges, Total       7,737
US Telecom | 2024 Reorganization | Operating segments        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Contract termination costs 1,100      
International Telecom | Disposal | Non-core fixed asset        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Gain (loss) on disposal of fixed asset 15,500      
Proceeds from sale of assets 17,800      
Book value of fixed asset 500      
Transaction costs 1,800      
International Telecom | Operating segments        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Restructuring Charges, Total 1,489 3,491    
Book value of fixed asset 466,861 $ 481,911    
International Telecom | 2023 Restructuring        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Employee termination benefits       4,681
Restructuring Charges, Total       $ 4,681
International Telecom | 2024 Reorganization | Operating segments        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Contract termination costs $ 300