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Accounts Receivable, net (Tables)
 3 Months Ended
Mar. 28, 2021
Receivables [Abstract]  
Components of Accounts Receivable, Net
The components of accounts receivable, net consisted of the following as of the dates presented (in thousands):
March 28,December 31,
20212020
Billed receivables$169,668 $227,787 
Unbilled receivables395,455 360,552 
Less allowance for credit losses(2,725)(2,828)
    Total accounts receivables, net$562,398 $585,511