REVENUE RECOGNITION AND RECEIVABLES - Contract Assets and Liabilities (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Contract Assets and Liabilities
Contract Asset - current	$ 3,241	$ 2,932
Change in contract asset - current	$ 309
% of change in contract asset - current	10.50%
Contract Asset - noncurrent	$ 4,050	3,775
Change in contract asset - noncurrent	$ 275
% of change in contract asset - noncurrent	7.30%
Contract liability- current	$ (29,872)	(27,284)
Change in contract liabilities - current	$ (2,588)
% of change in contract liabilities - current	9.50%
Contract liability- noncurrent	$ (65,848)	(72,543)
Change in contract liabilities - noncurrent	$ 6,695
% of change in contract liabilities - Noncurrent	(9.20%)
Net contract liability	$ (88,429)	$ (93,120)
Change in net contract liability	$ 4,691
% of change in net contract liability	(5.00%)
Revenue recognized related to contract liability	$ 24,300
Amortization of contract assets	$ 2,200
Retail revenue period for billing postpaid customers in advance	1 month