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REVENUE RECOGNITION - Schedule of Assets and Liabilities Associated with Contracts from Customers (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
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Disaggregation Of Revenue [Line Items] |  |
Accounts receivable | $ 82,592 | $ 60,452
Short-term deferred revenue | 99,565 | 97,333
Long-term deferred revenue | 49,866 | $ 47,529
Other Current Assets [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Short-term unbilled receivables | $ 2,757 |

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