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REVENUE RECOGNITION AND RECEIVABLES - Contract Assets and Liabilities (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2021 USD ($)
Contract Assets and Liabilities
Contract Asset - current	$ 2,478
Change in contract asset - current	1,058
Contract Asset - current	$ 3,536
% of change in contract asset - current	43.00%
Contract asset, noncurrent	$ 910
Change in contract asset - noncurrent	6
Contract asset, noncurrent	$ 916
% of change in contract asset - noncurrent	1.00%
Contract liability- current	$ (18,544)
Change in contract liabilities - current	3,212
Contract liability- current	$ (15,332)
% of change in contract liabilities - current	17.00%
Contract liability- noncurrent	$ (2,193)
Change in contract liabilities - noncurrent	68
Contract liability- noncurrent	$ (2,125)
% of change in contract liabilities - Noncurrent	3.00%
Net contract liability	$ (17,349)
Change in net contract liability	4,344
Net contract liability	$ (13,005)
% of change in net contract liability	25.00%
Revenue recognized related to contract liability	$ 18,200
Amortization of contract assets	1,400
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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+ References

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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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