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RECEIVABLES, CONTRACT ASSETS, AND DEFERRED REVENUE- Contract Effective (Details) $ in Thousands | 6 Months Ended
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Jun. 30, 2020 USD ($)
Receivables [Abstract] |
2020 | $ 75,893
2019 | 100,671
2018 | 46,700
2017 | 38,899
2016 and prior | 45,398
Unbilled Revenue Total | $ 307,561
2020 | 25.00%
2019 | 32.00%
2018 | 15.00%
2017 | 13.00%
2016 and prior | 15.00%
Total Percentage of Unbilled Revenue | 100.00%
Revenue recognized during the period that was included in deferred revenue | $ 136,800

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