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Accounts Payable, Accrued Expenses and Other Liabilities - Components of Other Liabilities (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | --- | ---
Payables and Accruals [Abstract] |  |  |
Accrued compensation | $ 111,988 | $ 112,528 |
Payroll and other taxes payable | 63,822 | 59,277 |
Financial guarantee liability | 29,802 | 28,551 | $ 27,729
Deferred rent | 6,163 | 6,381 |
Contingent consideration | 25,910 | 25,740 |
Other | 9,110 | 9,264 |
Total | $ 246,795 | $ 241,741 |

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