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Contract Balances (Tables) | 12 Months Ended
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Dec. 31, 2023
Revenue from Contract with Customer [Abstract] |
Schedule of Contracts with Customers, Asset and Liabilities | Accounts receivable and unbilled revenue are as follows:
| December 31, 2023 | December 31, 2022
| (in thousands)
Billed services (accounts receivable) | $ | 1,821,855 |  | $ | 1,751,950 |
Allowance for credit losses (note 5) | (31,533) |  | (20,562) |
Accounts receivable (net) | 1,790,322 |  | 1,731,388 |
Unbilled services (unbilled revenue) | 951,936 |  | 957,655 |
Accounts receivable and unbilled revenue, net | $ | 2,742,258 |  | $ | 2,689,043 |
Unbilled services and unearned revenue or payments on account (contract assets and liabilities) were as follows:
(in thousands, except percentages) | December 31, 2023 |  | December 31, 2022 |  | $ Change |  | % Change
Unbilled services (unbilled revenue) | $ | 951,936 |  |  | $ | 957,655 |  |  | $ | (5,719) |  |  | (0.6) | %
Unearned revenue (payments on account) | (1,654,507) |  |  | (1,507,449) |  |  | (147,058) |  |  | 9.8 | %
Net balance | $ | (702,571) |  |  | $ | (549,794) |  |  | $ | (152,777) |  |  | 27.8 | %

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- Definition Tabular disclosure of receivable, contract asset, and contract liability from contract with customer. Includes, but is not limited to, change in contract asset and contract liability. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479806/606-10-50-10 + Details
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