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GOVERNMENT SUPPORT AND SPECTRUM MATTERS - Communication Services Revenue (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
GOVERNMENT SUPPORT AND SPECTRUM MATTERS        
Revenue from contract with customer $ 166,484 $ 169,366 $ 331,123 $ 342,274
High cost support | Communication services        
GOVERNMENT SUPPORT AND SPECTRUM MATTERS        
Revenue from contract with customer 4,471 4,876 8,899 9,723
High cost support | US Telecom | Communication services        
GOVERNMENT SUPPORT AND SPECTRUM MATTERS        
Revenue from contract with customer 3,101 3,483 6,216 6,937
High cost support | International Telecom | Communication services        
GOVERNMENT SUPPORT AND SPECTRUM MATTERS        
Revenue from contract with customer 1,370 1,393 2,683 2,786
CAF II (including ACF) | Communication services        
GOVERNMENT SUPPORT AND SPECTRUM MATTERS        
Revenue from contract with customer 8,227 6,784 16,397 13,571
CAF II (including ACF) | US Telecom | Communication services        
GOVERNMENT SUPPORT AND SPECTRUM MATTERS        
Revenue from contract with customer 8,227 6,784 16,397 13,571
RDOF | Communication services        
GOVERNMENT SUPPORT AND SPECTRUM MATTERS        
Revenue from contract with customer 69 145 144 290
RDOF | US Telecom | Communication services        
GOVERNMENT SUPPORT AND SPECTRUM MATTERS        
Revenue from contract with customer 69 145 144 290
ECF | Communication services        
GOVERNMENT SUPPORT AND SPECTRUM MATTERS        
Revenue from contract with customer   498   7,312
ECF | US Telecom | Communication services        
GOVERNMENT SUPPORT AND SPECTRUM MATTERS        
Revenue from contract with customer   498   7,312
RHC | Communication services        
GOVERNMENT SUPPORT AND SPECTRUM MATTERS        
Revenue from contract with customer 4,353 3,682 8,715 7,119
RHC | US Telecom | Communication services        
GOVERNMENT SUPPORT AND SPECTRUM MATTERS        
Revenue from contract with customer 4,353 3,682 8,715 7,119
Other | Communication services        
GOVERNMENT SUPPORT AND SPECTRUM MATTERS        
Revenue from contract with customer 1,571 1,862 3,212 8,877
Other | US Telecom | Communication services        
GOVERNMENT SUPPORT AND SPECTRUM MATTERS        
Revenue from contract with customer 1,567 1,707 3,204 8,407
Other | International Telecom | Communication services        
GOVERNMENT SUPPORT AND SPECTRUM MATTERS        
Revenue from contract with customer 4 155 8 470
USF, CAF II, RDOF, ECF, RHC and Other Programs | Communication services        
GOVERNMENT SUPPORT AND SPECTRUM MATTERS        
Revenue from contract with customer 18,691 17,847 37,367 46,892
USF, CAF II, RDOF, ECF, RHC and Other Programs | US Telecom | Communication services        
GOVERNMENT SUPPORT AND SPECTRUM MATTERS        
Revenue from contract with customer 17,317 16,299 34,676 43,636
USF, CAF II, RDOF, ECF, RHC and Other Programs | International Telecom | Communication services        
GOVERNMENT SUPPORT AND SPECTRUM MATTERS        
Revenue from contract with customer $ 1,374 $ 1,548 $ 2,691 $ 3,256