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Schedule III. Supplementary Insurance Information (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Abstract] |  |  |
Deferred Policy Acquisition Costs | $ 158,184 | $ 147,224 | $ 126,532
Future Policy Benefits, Losses, Claims and Loss Expenses | 1,924,826 | 1,796,782 | 1,638,755
Unearned Premium | 660,210 | 621,448 | 549,384
Earned Premium Revenue | 1,292,696 | 1,176,750 | 1,034,587
Investment Income, Net | 97,538 | 81,986 | 59,606
Benefits, Claims, Losses and Settlement Expenses | 764,402 | 744,605 | 769,414
Amortization of Deferred Policy Acquisition Costs | 315,323 | 281,338 | 244,991
Other Underwriting Expenses | 146,609 | 140,942 | 115,800
Written Premium | $ 1,346,219 | $ 1,231,470 | $ 1,066,901

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