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Accounts Receivable, net
 9 Months Ended
Sep. 26, 2021
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):
September 26,December 31,
20212020
Billed receivables$170,005 $227,787 
Unbilled receivables358,345 360,552 
Less allowance for credit losses(3,643)(2,828)
    Total accounts receivables, net$524,707 $585,511 
As of September 26, 2021 approximately 92.4% of the Company’s accounts receivable are with the U.S. government.