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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, 2025
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,
2025		December 31,
2024
(in thousands)
Billed services (accounts receivable)$1,427,376 $1,437,653 
Allowance for credit losses(39,686)(35,664)
Accounts receivable net1,387,690 1,401,989 
Unbilled services (unbilled revenue)1,258,706 1,286,274 
Accounts receivable and unbilled revenue, net$2,646,396 $2,688,263 

Unbilled services and unearned revenue or payments on account (contract assets and liabilities) were as follows:
September 30,
2025		December 31,
2024		$ Change% Change
(in thousands, except percentages)
Unbilled services (unbilled revenue)$1,258,706 $1,286,274 $(27,568)(2.1)%
Unearned revenue (payments on account)(1,528,343)(1,614,758)86,415 (5.4)%
Net balance$(269,637)$(328,484)$58,847 (17.9)%