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Contract Balances (Tables)
12 Months Ended
Dec. 31, 2022
Revenue from Contract with Customer [Abstract]  
Schedule of Contracts with Customers, Asset and Liabilities
Accounts receivable and unbilled revenue are as follows:
December 31, 2022December 31, 2021
(in thousands)
Billed services (accounts receivable)$1,751,950 $1,349,851 
Allowance for credit losses (note 5)(20,562)(7,081)
Accounts receivable (net)1,731,388 1,342,770 
Unbilled services (unbilled revenue)$957,655 $623,121 
Accounts receivable and unbilled revenue, net$2,689,043 $1,965,891 

Unbilled services and unearned revenue or payments on account (contract assets and liabilities) were as follows:
(in thousands, except percentages)December 31, 2022December 31, 2021$ Change% Change
Unbilled services (unbilled revenue)$957,655 $623,121 $334,534 53.7 %
Unearned revenue (payments on account)(1,507,449)(1,323,961)(183,488)13.9 %
Net balance$(549,794)$(700,840)$151,046 21.6 %