GOVERNMENT SUPPORT AND SPECTRUM MATTERS - Replace and Remove Program (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Remove And Replace Program
Mobility Fund [Line Items]
Beginning balance, Total spend	$ 64,388	$ 3,325
Amounts spent	16,302	3,385
Ending balance, Total spend	80,690	6,710
Beginning balance, Total reimbursements	(17,127)
Reimbursements received	(14,429)
Ending balance, Total reimbursements	(31,556)
Amount pending reimbursement	49,134	6,710
Capital Amount
Mobility Fund [Line Items]
Beginning balance, Total spend	49,262	1,836
Amounts spent	11,734	1,485
Ending balance, Total spend	60,996	3,321
Beginning balance, Total reimbursements	(12,773)
Reimbursements received	(8,586)
Ending balance, Total reimbursements	(21,359)
Amount pending reimbursement	39,637	3,321
Operating Amount
Mobility Fund [Line Items]
Beginning balance, Total spend	15,126	1,489
Amounts spent	4,568	1,900
Ending balance, Total spend	19,694	3,389
Beginning balance, Total reimbursements	(4,354)
Reimbursements received	(5,843)
Ending balance, Total reimbursements	(10,197)
Amount pending reimbursement	$ 9,497	$ 3,389