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Accounts receivable, unbilled revenue (contract assets) and unearned revenue or payments on account (contract liabilities) (Tables)
 9 Months Ended
Sep. 30, 2022
Revenue from Contract with Customer [Abstract]  
Schedule of accounts receivables and unbilled revenue, and unbilled services and unearned revenue
Accounts receivables and unbilled revenue are as follows:
September 30, 2022December 31, 2021
(in thousands)
Contract assets:
Billed services (accounts receivable)$1,458,753 $1,349,851 
Unbilled services (unbilled revenue)894,291 623,121 
Accounts receivable and unbilled revenue, gross2,353,044 1,972,972 
Allowance for credit losses(23,743)(7,081)
Accounts receivable and unbilled revenue, net$2,329,301 $1,965,891 
    
Unbilled services and unearned revenue or payments on account (contract assets and liabilities) were as follows:
(in thousands, except percentages)September 30, 2022December 31, 2021$ Change% Change
Unbilled services (unbilled revenue)$894,291 $623,121 $271,170 43.5 %
Unearned revenue (payments on account)(1,395,160)(1,323,961)(71,199)5.4 %
Net balance$(500,869)$(700,840)$199,971 (28.5)%