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RECEIVABLES, CONTRACT ASSETS, AND DEFERRED REVENUE RECEIVABLES, CONTRACT ASSETS, AND DEFERRED REVENUE - Summary of Contract Assets and Deferred Revenue (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Receivables [Abstract] |  |  |
Contract assets |  | $ 3,711 | $ 914
Long-term contract assets |  | 2,543 | 0
Total contract assets |  | 6,254 | 914
Deferred revenue | [1] | 185,145 | 165,850
Long-term deferred revenue |  | 5,344 | 3,706
Total deferred revenue |  | $ 190,489 | $ 169,556
[1] | On January 1, 2018, the Company adopted the ASC 606 revenue recognition standard and adjusted prior periods to conform. See "Note 2. Significant Accounting Policies" for additional information.

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