REVENUE RECOGNITION AND RECEIVABLES - Contract Assets and Liabilities (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2023	Dec. 31, 2022
Contract Assets and Liabilities
Contract Asset - current	$ 3,046	$ 2,932
Change in contract asset - current	$ 114
% of change in contract asset - current	3.90%
Contract Asset - noncurrent	$ 3,671	3,775
Change in contract asset - noncurrent	$ (104)
% of change in contract asset - noncurrent	(2.80%)
Contract liability- current	$ (28,444)	(27,284)
Change in contract liabilities - current	$ (1,160)
% of change in contract liabilities - current	4.30%
Contract liability- noncurrent	$ (67,840)	(72,543)
Change in contract liabilities - noncurrent	$ 4,703
% of change in contract liabilities - Noncurrent	(6.50%)
Net contract liability	$ (89,567)	$ (93,120)
Change in net contract liability	$ 3,553
% of change in net contract liability	(3.80%)
Revenue recognized related to contract liability	$ 19,200
Amortization of contract assets	$ 1,500
Retail revenue period for billing postpaid customers in advance	1 month