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GOVERNMENT SUPPORT AND SPECTRUM MATTERS - Communication Services Revenue (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
GOVERNMENT SUPPORT AND SPECTRUM MATTERS        
Revenue from contract with customer $ 166,927 $ 164,602 $ 498,051 $ 506,876
High cost support | Communication services        
GOVERNMENT SUPPORT AND SPECTRUM MATTERS        
Revenue from contract with customer 5,436 4,867 14,335 14,591
High cost support | US Telecom | Communication services        
GOVERNMENT SUPPORT AND SPECTRUM MATTERS        
Revenue from contract with customer 4,073 3,473 10,289 10,411
High cost support | International Telecom | Communication services        
GOVERNMENT SUPPORT AND SPECTRUM MATTERS        
Revenue from contract with customer 1,363 1,394 4,046 4,180
CAF II (including ACF) | Communication services        
GOVERNMENT SUPPORT AND SPECTRUM MATTERS        
Revenue from contract with customer 8,254 6,731 24,650 20,303
CAF II (including ACF) | US Telecom | Communication services        
GOVERNMENT SUPPORT AND SPECTRUM MATTERS        
Revenue from contract with customer 8,254 6,731 24,650 20,303
RDOF | Communication services        
GOVERNMENT SUPPORT AND SPECTRUM MATTERS        
Revenue from contract with customer 75 175 219 465
RDOF | US Telecom | Communication services        
GOVERNMENT SUPPORT AND SPECTRUM MATTERS        
Revenue from contract with customer 75 175 219 465
ECF | Communication services        
GOVERNMENT SUPPORT AND SPECTRUM MATTERS        
Revenue from contract with customer       7,312
ECF | US Telecom | Communication services        
GOVERNMENT SUPPORT AND SPECTRUM MATTERS        
Revenue from contract with customer       7,312
Rural Health Care ("RHC") | Communication services        
GOVERNMENT SUPPORT AND SPECTRUM MATTERS        
Revenue from contract with customer 3,790 4,420 12,505 11,539
Rural Health Care ("RHC") | US Telecom | Communication services        
GOVERNMENT SUPPORT AND SPECTRUM MATTERS        
Revenue from contract with customer 3,790 4,420 12,505 11,539
Other | Communication services        
GOVERNMENT SUPPORT AND SPECTRUM MATTERS        
Revenue from contract with customer 1,335 1,911 4,548 10,789
Other | US Telecom | Communication services        
GOVERNMENT SUPPORT AND SPECTRUM MATTERS        
Revenue from contract with customer 1,332 1,908 4,536 10,316
Other | International Telecom | Communication services        
GOVERNMENT SUPPORT AND SPECTRUM MATTERS        
Revenue from contract with customer 3 3 12 473
USF, CAF II, RDOF, ECF, RHC and Other Programs | Communication services        
GOVERNMENT SUPPORT AND SPECTRUM MATTERS        
Revenue from contract with customer 18,890 18,104 56,257 64,999
USF, CAF II, RDOF, ECF, RHC and Other Programs | US Telecom | Communication services        
GOVERNMENT SUPPORT AND SPECTRUM MATTERS        
Revenue from contract with customer 17,524 16,707 52,199 60,346
USF, CAF II, RDOF, ECF, RHC and Other Programs | International Telecom | Communication services        
GOVERNMENT SUPPORT AND SPECTRUM MATTERS        
Revenue from contract with customer $ 1,366 $ 1,397 $ 4,058 $ 4,653