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REVENUE RECOGNITION AND RECEIVABLES - Contract Assets and Liabilities (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2022	Dec. 31, 2021
Contract Assets and Liabilities
Contract Asset - current	$ 3,502	$ 4,805
Change in contract asset - current	$ (1,303)
% of change in contract asset - current	(27.00%)
Contract Asset - noncurrent	$ 906	900
Change in contract asset - noncurrent	$ 6
% of change in contract asset - noncurrent	1.00%
Contract liability- current	$ (25,181)	(25,332)
Change in contract liabilities - current	$ 151
% of change in contract liabilities - current	1.00%
Contract liability- noncurrent	$ (75,919)	(81,391)
Change in contract liabilities - noncurrent	$ 5,472
% of change in contract liabilities - Noncurrent	7.00%
Net contract liability	$ (96,692)	$ (101,018)
Change in net contract liability	$ 4,326
% of change in net contract liability	4.00%
Revenue recognized related to contract liability	$ 20,400
Amortization of contract assets	$ 1,400
Retail revenue period for billing postpaid customers in advance	1 month

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