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Accounts Receivable (Tables)
 3 Months Ended
Mar. 31, 2021
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, 2021 and December 31, 2020 (in thousands):
 
March 31,
2021		December 31,
2020
Trade accounts receivable$480,924 $473,474 
Unbilled accounts receivable187,266 188,400 
Gross accounts receivable668,190 661,874 
Allowances for current expected credit losses and other reserves(1,654)(1,822)
Accounts receivable, net$666,536 $660,052 
Summary of Allowance for Credit Loss Activity
The following table summarizes the activity of the Company's allowance for current expected credit losses and other reserves during the three months ended March 31, 2021 and 2020 (in thousands):

March 31,
2021		March 31,
2020
Beginning balance$1,822 $1,880 
Charges to income from operations923 1,752 
Collections from customers previously reserved and other(1,091)(451)
Ending balance$1,654 $3,181