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RECEIVABLES, CONTRACT ASSETS, AND DEFERRED REVENUE - Summary of Receivable (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Receivables [Abstract] |  |
Accounts receivable | $ 199,720 | $ 180,872
Unbilled receivables | 180,219 | 172,656
Long-term unbilled receivables | 121,736 | 151,237
Total receivables | $ 501,675 | $ 504,765

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