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RECEIVABLES, CONTRACT ASSETS, AND DEFERRED REVENUE- Contract Effective (Details) $ in Thousands	Dec. 31, 2020 USD ($)
Receivables [Abstract]
2020	$ 149,867
2019	87,941
2018	31,097
2017	31,668
2016 and prior	19,860
Unbilled revenue total	$ 320,433
2020	47.00%
2019	27.00%
2018	10.00%
2017	10.00%
2016 and prior	6.00%
Total percentage of unbilled revenue	100.00%

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