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GOVERNMENT SUPPORT AND SPECTRUM MATTERS - Replace and Remove Program (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Mobility Fund [Line Items]    
Beginning balance, Total spend $ 64,388 $ 3,325
Amounts spent 104,007 61,063
Ending balance, Total spend 168,395 64,388
Beginning balance, Total reimbursements (17,127)  
Reimbursements received (113,594) (17,127)
Ending balance, Total reimbursements (130,721) (17,127)
Amount pending reimbursement 37,674 47,261
Capital Amount    
Mobility Fund [Line Items]    
Beginning balance, Total spend 49,262 1,836
Amounts spent 91,687 47,426
Ending balance, Total spend 140,949 49,262
Beginning balance, Total reimbursements (12,773)  
Reimbursements received (90,767) (12,773)
Ending balance, Total reimbursements (103,540) (12,773)
Amount pending reimbursement 37,409 36,489
Operating Amount    
Mobility Fund [Line Items]    
Beginning balance, Total spend 15,126 1,489
Amounts spent 12,320 13,637
Ending balance, Total spend 27,446 15,126
Beginning balance, Total reimbursements (4,354)  
Reimbursements received (22,827) (4,354)
Ending balance, Total reimbursements (27,181) (4,354)
Amount pending reimbursement $ 265 $ 10,772