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Accounts Receivable, net
 12 Months Ended
Dec. 31, 2020
Receivables [Abstract]  
Accounts Receivable, net Accounts Receivable, net
The components of Accounts receivable, net consisted of the following as of the dates presented (in thousands):
December 31,December 31,
20202019
Billed receivables$227,787 $148,747 
Unbilled receivables360,552 295,103 
Less allowance for credit losses(2,828)(1,670)
    Total accounts receivables, net$585,511 $442,180 

As of December 31, 2020 approximately 91.4% of the Company’s accounts receivable are with the U.S. government.