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RECEIVABLES, CONTRACT ASSETS, AND DEFERRED REVENUE RECEIVABLES, CONTRACT ASSETS, AND DEFERRED REVENUE - Summary of Unbilled Receivables (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Receivables [Abstract] |  |  |
1 Year or less | [1] | $ 172,656 | $ 160,084
1-2 Years |  | 95,013 |
2-5 Years |  | 56,224 |
Total |  | $ 323,893 |
Percentage of unbilled receivables, 1 Year or Less |  | 54.00% |
Percentage of unbilled receivables, 1-2 Years |  | 29.00% |
Percentage of unbilled receivables, 2-5 Years |  | 17.00% |
Total percentage of unbilled receivables |  | 100.00% |
[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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- References No definition available. + Details
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