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Accounts Receivable
 9 Months Ended
Sep. 30, 2024
Accounts, Notes, Loans and Financing Receivable, Gross, Allowance, and Net [Abstract]  
Accounts Receivable Accounts Receivable
Net accounts receivable consisted of the following as of September 30, 2024 and December 31, 2023 (in thousands):
 
September 30,
2024		December 31,
2023
Trade accounts receivable$492,539 $516,175 
Unbilled accounts receivable207,774 211,596 
Gross accounts receivable700,313 727,771 
Allowances for current expected credit losses and other reserves(3,820)(3,469)
Accounts receivable, net$696,493 $724,302 

A summary of activity in the accounts receivable allowance for current expected credit losses and other reserves for the nine months ended September 30, 2024 and 2023 was as follows (in thousands):

September 30,
2024		September 30,
2023
Beginning balance$3,469 $5,917 
Charges to income from operations4,832 10,209 
Collections from customers previously reserved and other(4,481)(10,039)
Ending balance$3,820 $6,087 

Charges to income from operations primarily represents charges to provision for doubtful accounts for increases in the allowance for current expected credit losses.