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Accounts Receivable (Tables)
 3 Months Ended
Mar. 31, 2022
Accounts, Notes, Loans and Financing Receivable, Gross, Allowance, and Net [Abstract]  
Schedule of Accounts Receivable
Net accounts receivable consisted of the following as of March 31, 2022 and December 31, 2021 (in thousands):
 
March 31,
2022		December 31,
2021
Trade accounts receivable$511,584 $501,959 
Unbilled accounts receivable210,488 175,364 
Gross accounts receivable722,072 677,323 
Allowances for current expected credit losses and other reserves(3,279)(1,397)
Accounts receivable, net$718,793 $675,926 
Summary of Allowance for Credit Loss Activity
A summary of activity in the accounts receivable allowance for current expected credit losses and other reserves for the three months ended March 31, 2022 and 2021 is as follows (in thousands):

March 31,
2022		March 31,
2021
Beginning balance$1,397 $1,822 
Charges to income from operations1,951 923 
Collections from customers previously reserved and other(69)(1,091)
Ending balance$3,279 $1,654