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SCHEDULE VI. SUPPLEMENTARY INSURANCE INFORMATION CONCERNING PROPERTY-CASUALTY INSURANCE OPERATIONS (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
SEC Schedule, 12-18, Supplemental Information, Property-Casualty Insurance Underwriters [Line Items] |  |  |
Current year | $ 6,184,315 | $ 4,024,116 | $ 4,586,422
Prior years | (851,334) | (450,607) | (247,582)
Consolidated Subsidiaries |  |  |
SEC Schedule, 12-18, Supplemental Information, Property-Casualty Insurance Underwriters [Line Items] |  |  |
Deferred Policy Acquisition Costs | 1,552,359 | 1,751,437 | 1,171,738
Reserves for Unpaid Claims and Claim Adjustment Expenses | 21,303,491 | 20,486,869 | 15,892,573
Discount, if any, Deducted | 0 | 0 | 0
Unearned Premiums | 5,950,415 | 6,136,135 | 4,559,107
Earned Premiums | 10,095,760 | 7,471,133 | 6,333,989
Net Investment Income | 1,654,289 | 1,253,110 | 559,932
Current year | 6,184,315 | 4,024,116 | 4,586,422
Prior years |  | (450,607) | (247,582)
Amortization of Deferred Policy Acquisition Costs | 2,643,867 | 1,875,034 | 1,568,606
Paid Claims and Claim Adjustment Expenses | 3,597,810 | 2,995,678 | 2,030,156
Net Premiums Written | $ 9,952,216 | $ 7,467,813 | $ 7,196,160

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- Definition Line items represent financial concepts included in a table. 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