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REVENUE RECOGNITION AND RECEIVABLES - Contract Assets and Liabilities (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2020
Contract Assets and Liabilities |  |
Contract Asset - current |  | $ 2,413
Change in contract asset - current |  | (196)
Contract Asset - current | $ 2,217 | $ 2,217
% of change in contract asset - current |  | (8.00%)
Contract asset, noncurrent |  | $ 905
Change in contract Asset - noncurrent |  | (254)
Contract asset, noncurrent | 651 | $ 651
% of change in contract Asset - noncurrent |  | (28.00%)
Contract liability- current |  | $ (15,044)
Change in contract liabilities - current |  | 1,446
Contract liability- current | (13,598) | $ (13,598)
% of change in contract liabilities - current |  | 10.00%
Contract liability- noncurrent |  | $ (5,450)
Change in contract liabilities - noncurrent |  | 257
Contract liability- noncurrent | (5,193) | $ (5,193)
% of change in contract liabilities - Noncurrent |  | 5.00%
Net contract liability |  | $ (17,176)
Change in net contract liability |  | 1,253
Net contract liability | (15,923) | $ (15,923)
% of change in net contract liability |  | 7.00%
Revenue recognized related to contract liability |  | $ 13,200
Amortization of contract assets | $ 600 | 1,300
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 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 net of amount of obligation to transfer good or service to customer for which consideration has been received or is receivable. + References No definition available. + Details
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