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SCHEDULE VI. SUPPLEMENTARY INSURANCE INFORMATION CONCERNING PROPERTY-CASUALTY INSURANCE OPERATIONS (Details) - USD ($)
$ in Thousands
 12 Months Ended
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