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REVENUE RECOGNITION AND RECEIVABLES - Contract Assets and Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2020
Contract Assets and Liabilities
Contract Asset - current		$ 2,413
Change in contract asset - current		(144)
Contract Asset - current	$ 2,269	$ 2,269
% of change in contract asset - current		(6.00%)
Contract asset, noncurrent		$ 905
Change in contract asset - noncurrent		(206)
Contract asset, noncurrent	699	$ 699
% of change in contract asset - noncurrent		(23.00%)
Contract liability- current		$ (15,044)
Change in contract liabilities - current		(1,294)
Contract liability- current	(16,338)	$ (16,338)
% of change in contract liabilities - current		(9.00%)
Contract liability- noncurrent		$ (5,450)
Change in contract liabilities - noncurrent		2,964
Contract liability- noncurrent	(2,486)	$ (2,486)
% of change in contract liabilities - Noncurrent		54.00%
Net contract liability		$ (17,176)
Change in net contract liability		1,320
Net contract liability	(15,856)	$ (15,856)
% of change in net contract liability		8.00%
Revenue recognized related to contract liability		$ 15,000
Amortization of contract assets	$ 500	1,900
Revenue recognized in the period related to performance obligations that were satisfied or partially satisfied in previous periods		$ 0
Retail revenue period for billing postpaid customers in advance		1 month

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