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RECEIVABLES, CONTRACT ASSETS, AND DEFERRED REVENUE- Contract Effective (Details) $ in Thousands | 9 Months Ended
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Sep. 30, 2020 USD ($)
Receivables [Abstract] |
2020 | $ 105,380
2019 | 99,875
2018 | 39,281
2017 | 37,824
2016 and prior | 34,919
Unbilled revenue total | $ 317,279
2020 | 33.00%
2019 | 32.00%
2018 | 12.00%
2017 | 12.00%
2016 and prior | 11.00%
Total percentage of unbilled revenue | 100.00%
Revenue recognized during the period that was included in deferred revenue | $ 170,500

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