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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