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RECEIVABLES, CONTRACT ASSETS, AND DEFERRED REVENUE- Contract Effective (Details) $ in Thousands	Mar. 31, 2021 USD ($)
Receivables [Abstract]
2021	$ 46,625
2020	163,226
2019	63,600
2018	28,885
2017 and prior	34,315
Unbilled revenue total	$ 336,651
2021	14.00%
2020	48.00%
2019	19.00%
2018	9.00%
2017 and prior	10.00%
Total percentage of unbilled revenue	100.00%

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- Definition

Percentage of Unbilled Receivables, Not Billable, Contract Date, Year Four and Prior

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Percentage of Unbilled Receivables, Not Billable, Contract Date, Year One

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Percentage of Unbilled Receivables, Not Billable, Contract Date, Year Two

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Total Percentage of Unbilled Revenue

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Unbilled Revenue Total

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