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GOVERNMENT SUPPORT AND SPECTRUM MATTERS - Replace and Remove Program (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
GOVERNMENT SUPPORT AND SPECTRUM MATTERS    
Beginning balance, Total spend $ 168,395 $ 64,388
Amounts spent 45,309 75,550
Ending balance, Total spend 213,704 139,938
Beginning balance, Total reimbursements (130,721) (17,127)
Reimbursements received (57,684) (87,189)
Ending balance, Total reimbursements (188,405) (104,316)
Amount pending reimbursement 25,299 35,622
Capital Amount    
GOVERNMENT SUPPORT AND SPECTRUM MATTERS    
Beginning balance, Total spend 140,949 49,262
Amounts spent 36,445 66,501
Ending balance, Total spend 177,394 115,763
Beginning balance, Total reimbursements (103,540) (12,773)
Reimbursements received (48,555) (68,450)
Ending balance, Total reimbursements (152,095) (81,223)
Amount pending reimbursement 25,299 34,540
Operating Amount    
GOVERNMENT SUPPORT AND SPECTRUM MATTERS    
Beginning balance, Total spend 27,446 15,126
Amounts spent 8,864 9,049
Ending balance, Total spend 36,310 24,175
Beginning balance, Total reimbursements (27,181) (4,354)
Reimbursements received (9,129) (18,739)
Ending balance, Total reimbursements $ (36,310) (23,093)
Amount pending reimbursement   $ 1,082