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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, 2024
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,
2024		December 31,
2023
(in thousands)
Billed services (accounts receivable)$1,604,945 $1,821,855 
Allowance for credit losses(35,303)(31,533)
Accounts receivable (net)1,569,642 1,790,322 
Unbilled services (unbilled revenue)1,230,948 951,936 
Accounts receivable and unbilled revenue, net$2,800,590 $2,742,258 
    
Unbilled services and unearned revenue or payments on account (contract assets and liabilities) were as follows:
(in thousands, except percentages)June 30,
2024		December 31,
2023		$ Change% Change
Unbilled services (unbilled revenue)$1,230,948 $951,936 $279,012 29.3 %
Unearned revenue (payments on account)(1,602,526)(1,654,507)51,981 (3.1)%
Net balance$(371,578)$(702,571)$330,993 (47.1)%