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RECEIVABLES, CONTRACT ASSETS, AND DEFERRED REVENUE - Summary of Receivable (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
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Receivables [Abstract] |  |
Accounts receivable | $ 159,324 | $ 215,827
Unbilled receivables | 228,603 | 207,155
Long-term unbilled receivables | 108,048 | 113,278
Total receivables | $ 495,975 | $ 536,260

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