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SCHEDULE III. SUPPLEMENTARY INSURANCE INFORMATION (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items] |  |  |
Deferred Policy Acquisition Costs | $ 1,552,359 | $ 1,751,437 | $ 1,171,738
Future Policy Benefits, Losses, Claims and Loss Expenses | 21,303,491 | 20,486,869 | 15,892,573
Unearned Premiums | 5,950,415 | 6,136,135 | 4,559,107
Premium Revenue | 10,095,760 | 7,471,133 | 6,333,989
Net Investment Income | 1,654,289 | 1,253,110 | 559,932
Benefits, Claims, Losses and Settlement Expenses | 5,332,981 | 3,573,509 | 4,338,840
Amortization of Deferred Policy Acquisition Costs | 2,643,867 | 1,875,034 | 1,568,606
Other Operating Expenses | 496,588 | 375,182 | 276,691
Net Written Premiums | 9,952,216 | 7,467,813 | 7,196,160
Other |  |  |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items] |  |  |
Deferred Policy Acquisition Costs | 0 | 0 | 0
Future Policy Benefits, Losses, Claims and Loss Expenses | 0 | 0 | 0
Unearned Premiums | 0 | 0 | 0
Premium Revenue | 0 | 0 | 0
Net Investment Income | 1,654,289 | 1,253,110 | 559,932
Benefits, Claims, Losses and Settlement Expenses | 0 | 0 | 0
Amortization of Deferred Policy Acquisition Costs | 0 | 0 | 0
Other Operating Expenses | 0 | 0 | 0
Net Written Premiums | 0 | 0 | 0
Property | Operating Segments |  |  |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items] |  |  |
Deferred Policy Acquisition Costs | 234,652 | 274,288 | 202,999
Future Policy Benefits, Losses, Claims and Loss Expenses | 6,572,739 | 7,833,620 | 7,535,832
Unearned Premiums | 1,193,695 | 1,158,294 | 1,002,149
Premium Revenue | 3,850,352 | 3,090,792 | 2,770,227
Net Investment Income | 0 | 0 | 0
Benefits, Claims, Losses and Settlement Expenses | 1,141,726 | 799,905 | 2,044,771
Amortization of Deferred Policy Acquisition Costs | 758,554 | 600,127 | 547,210
Other Operating Expenses | 302,360 | 251,433 | 194,355
Net Written Premiums | 3,833,636 | 2,967,309 | 2,847,659
Casualty and Specialty | Operating Segments |  |  |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items] |  |  |
Deferred Policy Acquisition Costs | 1,317,707 | 1,477,149 | 968,739
Future Policy Benefits, Losses, Claims and Loss Expenses | 14,730,752 | 12,653,249 | 8,356,741
Unearned Premiums | 4,756,720 | 4,977,841 | 3,556,958
Premium Revenue | 6,245,408 | 4,380,341 | 3,563,762
Net Investment Income | 0 | 0 | 0
Benefits, Claims, Losses and Settlement Expenses | 4,191,255 | 2,773,604 | 2,294,069
Amortization of Deferred Policy Acquisition Costs | 1,885,313 | 1,274,907 | 1,021,396
Other Operating Expenses | 194,228 | 123,749 | 82,336
Net Written Premiums | $ 6,118,580 | $ 4,500,504 | $ 4,348,501

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