REVENUE RECOGNITION AND RECEIVABLES - Contract Assets and Liabilities (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2022 USD ($)
Contract Assets and Liabilities
Contract Asset - current	$ 4,805
Change in contract asset - current	(682)
Contract Asset - current	$ 4,123
% of change in contract asset - current	(14.00%)
Contract asset, noncurrent	$ 900
Change in contract asset - noncurrent	(10)
Contract asset, noncurrent	$ 890
% of change in contract asset - noncurrent	(1.00%)
Contract liability- current	$ (25,332)
Change in contract liabilities - current	1,576
Contract liability- current	$ (23,756)
% of change in contract liabilities - current	6.00%
Contract liability- noncurrent	$ (81,391)
Change in contract liabilities - noncurrent	2,530
Contract liability- noncurrent	$ (78,861)
% of change in contract liabilities - Noncurrent	3.00%
Net contract liability	$ (101,018)
Change in net contract liability	3,414
Net contract liability	$ (97,604)
% of change in net contract liability	3.00%
Revenue recognized related to contract liability	$ 15,000
Amortization of contract assets	$ 700
Retail revenue period for billing postpaid customers in advance	1 month