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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, 2021
Revenue from Contract with Customer [Abstract]  
Schedule of Contracts with Customers, Asset and Liabilities Accounts receivables and unbilled revenue are as follows:
June 30, 2021December 31, 2020
(in thousands)
Contract assets:
Billed services (accounts receivable)$684,355 $722,420 
Unbilled services (unbilled revenue)415,390 428,684 
Accounts receivable and unbilled revenue1,099,745 1,151,104 
Allowance for credit losses(7,108)(7,149)
Accounts receivable and unbilled revenue, net$1,092,637 $1,143,955 
    
Unbilled services and unearned revenue or payments on account (contract assets and liabilities) were as follows:
(in thousands, except percentages)June 30, 2021December 31, 2020$ Change% Change
Unbilled services (unbilled revenue)$415,390 $428,684 $(13,294)(3.1)%
Unearned revenue (payments on account)(675,234)(660,883)(14,351)2.2 %
Net balance$(259,844)$(232,199)$(27,645)11.9 %