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Accounts receivable, unbilled revenue (contract assets) and unearned revenue or payments on account (contract liabilities) (Tables)
 6 Months Ended
Jun. 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:
June 30, 2022December 31, 2021
(in thousands)
Contract assets:
Billed services (accounts receivable)$1,372,345 $1,349,851 
Unbilled services (unbilled revenue)709,477 623,121 
Accounts receivable and unbilled revenue, gross2,081,822 1,972,972 
Allowance for credit losses(15,077)(7,081)
Accounts receivable and unbilled revenue, net$2,066,745 $1,965,891 
    
Unbilled services and unearned revenue or payments on account (contract assets and liabilities) were as follows:
(in thousands, except percentages)June 30, 2022December 31, 2021$ Change% Change
Unbilled services (unbilled revenue)$709,477 $623,121 $86,356 13.9 %
Unearned revenue (payments on account)(1,191,778)(1,323,961)132,183 (10.0)%
Net balance$(482,301)$(700,840)$218,539 (31.2)%