GOVERNMENT SUPPORT AND SPECTRUM MATTERS - Replace and Remove Program (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Mobility Fund [Line Items]
Beginning balance, Total spend	$ 168,395	$ 64,388
Amounts spent	13,676	16,302
Ending balance, Total spend	182,071	80,690
Beginning balance, Total reimbursements	(130,721)	(17,127)
Reimbursements received	(19,101)	(14,429)
Ending balance, Total reimbursements	(149,822)	(31,556)
Amount pending reimbursement	32,249	49,134
Capital Amount
Mobility Fund [Line Items]
Beginning balance, Total spend	140,949	49,262
Amounts spent	11,051	11,734
Ending balance, Total spend	152,000	60,996
Beginning balance, Total reimbursements	(103,540)	(12,773)
Reimbursements received	(16,211)	(8,586)
Ending balance, Total reimbursements	(119,751)	(21,359)
Amount pending reimbursement	32,249	39,637
Operating Amount
Mobility Fund [Line Items]
Beginning balance, Total spend	27,446	15,126
Amounts spent	2,625	4,568
Ending balance, Total spend	30,071	19,694
Beginning balance, Total reimbursements	(27,181)	(4,354)
Reimbursements received	(2,890)	(5,843)
Ending balance, Total reimbursements	$ (30,071)	(10,197)
Amount pending reimbursement		$ 9,497