v3.25.4
SCHEDULE III. SUPPLEMENTARY INSURANCE INFORMATION (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items]      
Deferred Policy Acquisition Costs $ 1,538,540 $ 1,552,359 $ 1,751,437
Future Policy Benefits, Losses, Claims and Loss Expenses 22,302,345 21,303,491 20,486,869
Unearned Premiums 6,028,174 5,950,415 6,136,135
Premium Revenue 9,901,182 10,095,760 7,471,133
Net Investment Income 1,703,475 1,654,289 1,253,110
Benefits, Claims, Losses and Settlement Expenses 5,615,839 5,332,981 3,573,509
Amortization of Deferred Policy Acquisition Costs 2,550,823 2,643,867 1,875,034
Other Operating Expenses 464,477 496,588 375,182
Net Written Premiums 9,870,200 9,952,216 7,467,813
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 1,703,475 1,654,289 1,253,110
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 231,168 234,652 274,288
Future Policy Benefits, Losses, Claims and Loss Expenses 5,685,984 6,572,739 7,833,620
Unearned Premiums 1,262,572 1,193,695 1,158,294
Premium Revenue 3,971,669 3,850,352 3,090,792
Net Investment Income 0 0 0
Benefits, Claims, Losses and Settlement Expenses 1,426,015 1,141,726 799,905
Amortization of Deferred Policy Acquisition Costs 714,852 758,554 600,127
Other Operating Expenses 297,481 302,360 251,433
Net Written Premiums 4,043,996 3,833,636 2,967,309
Casualty and Specialty | Operating Segments      
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items]      
Deferred Policy Acquisition Costs 1,307,372 1,317,707 1,477,149
Future Policy Benefits, Losses, Claims and Loss Expenses 16,616,361 14,730,752 12,653,249
Unearned Premiums 4,765,602 4,756,720 4,977,841
Premium Revenue 5,929,513 6,245,408 4,380,341
Net Investment Income 0 0 0
Benefits, Claims, Losses and Settlement Expenses 4,189,824 4,191,255 2,773,604
Amortization of Deferred Policy Acquisition Costs 1,835,971 1,885,313 1,274,907
Other Operating Expenses 166,996 194,228 123,749
Net Written Premiums $ 5,826,204 $ 6,118,580 $ 4,500,504