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Summary of Significant Accounting Policies - Summary of Deferred Policy Acquisition Cost Amortization and Net Advertising Expense (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Accounting Policies [Abstract] |  |  |
Deferred policy acquisition cost amortization | $ 858,261 | $ 708,525 | $ 654,612
Net advertising expense | $ 20,800 | $ 8,900 | $ 11,800

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