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REVENUE RECOGNITION - Contract Assets and Liabilities (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2019 | Dec. 31, 2018
Contract Assets and Liabilities |  |  |
Retail revenue period for billing postpaid customers in advance |  | 1 month |
Contract asset, current | $ 2,148 | $ 2,148 | $ 1,900
Change in contract asset - current |  | $ 248 |
% of change in contract asset - current |  | 13.00% |
Contract asset, noncurrent | 703 | $ 703 | 802
Change in contract Asset - noncurrent |  | $ (99) |
% of change in contract Asset - noncurrent |  | (12.00%) |
Contract liabilities | (17,729) | $ (17,729) | (13,787)
Change in contract liabilities |  | $ (3,942) |
% of change in contract liabilities |  | (29.00%) |
Net contract liability | (14,878) | $ (14,878) | $ (11,085)
Change in net contract liability |  | $ (3,793) |
% of change in net contract liability |  | (34.00%) |
Revenue recognized related to contract liability |  | $ 11,200 |
Amortization of contract assets | 400 | 1,500 |
Revenue recognized in the period related to performance obligations that were satisfied or partially satisfied in previous periods | $ 11,200 | $ 11,200 |

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- Definition Amount of increase (decrease) in revenue recognized for current cumulative catch-up adjustment from the timing of customer prepayments and contract billings which increases (decreases) right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time. + References No definition available. + Details
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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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- Definition Amount of increase (decrease) in revenue recognized for cumulative catch-up adjustment from the timing of customer prepayments and contract billings which increases (decreases) right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time. + References No definition available. + Details
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- Definition Amount of increase (decrease) in revenue recognized for noncurrent cumulative catch-up adjustment from the timing of customer prepayments and contract billings which increases (decreases) right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time. + References No definition available. + Details
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