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RECEIVABLES, CONTRACT ASSETS, AND DEFERRED REVENUE - Summary of Receivable (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Receivables [Abstract]    
Accounts receivable $ 215,827 $ 199,720
Unbilled receivables 207,155 180,219
Long-term unbilled receivables 113,278 121,736
Total receivables $ 536,260 $ 501,675