REVENUE RECOGNITION AND RECEIVABLES - Contract Assets and Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Dec. 31, 2023
Contract Assets and Liabilities
Retail revenue period for billing postpaid customers in advance	1 month
Contract Asset - current	$ 3,469	$ 3,616
Change in contract asset - current	$ (147)
% of change in contract asset - current	(4.10%)
Contract Asset - noncurrent	$ 5,490	5,509
Change in contract asset - noncurrent	$ (19)
% of change in contract asset - noncurrent	(0.30%)
Contract liability- current	$ (31,721)	(30,990)
Change in contract liabilities - current	$ (731)
% of change in contract liabilities - current	2.40%
Contract liability- noncurrent	$ (61,611)	(64,035)
Change in contract liabilities - noncurrent	$ 2,424
% of change in contract liabilities - Noncurrent	(3.80%)
Net contract liability	$ (84,373)	$ (85,900)
Change in net contract liability	$ 1,527
% of change in net contract liability	(1.80%)
Revenue recognized related to contract liability	$ 16,800
Amortization of contract assets	$ 1,300