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REVENUE RECOGNITION AND RECEIVABLES - Contract Assets and Liabilities (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2021 USD ($)
Contract Assets and Liabilities
Contract Asset - current	$ 2,478
Change in contract asset - current	566
Contract Asset - current	$ 3,044
% of change in contract asset - current	23.00%
Contract asset, noncurrent	$ 910
Change in contract asset - noncurrent	231
Contract asset, noncurrent	$ 1,141
% of change in contract asset - noncurrent	25.00%
Contract liability- current	$ (18,544)
Change in contract liabilities - current	1,385
Contract liability- current	$ (17,159)
% of change in contract liabilities - current	7.00%
Contract liability- noncurrent	$ (2,193)
Change in contract liabilities - noncurrent	(62)
Contract liability- noncurrent	$ (2,255)
% of change in contract liabilities - Noncurrent	(3.00%)
Net contract liability	$ (17,349)
Change in net contract liability	2,120
Net contract liability	$ (15,229)
% of change in net contract liability	12.00%
Revenue recognized related to contract liability	$ 15,100
Amortization of contract assets	700
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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- Definition

Represents the amortization of contract assets into revenue.

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Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time, classified as current.

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