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Schedule III. Supplementary Insurance Information (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items] |  |  |
Deferred Policy Acquisition Costs | $ 1,751,437 | $ 1,171,738 | $ 849,160
Future Policy Benefits, Losses, Claims and Loss Expenses | 20,486,869 | 15,892,573 | 13,294,630
Unearned Premiums | 6,136,135 | 4,559,107 | 3,531,213
Premium Revenue | 7,471,133 | 6,333,989 | 5,194,181
Net Investment Income | 1,253,110 | 559,932 | 319,479
Benefits, Claims, Losses and Settlement Expenses | 3,573,509 | 4,338,840 | 3,876,087
Amortization of Deferred Policy Acquisition Costs | 1,875,034 | 1,568,606 | 1,214,858
Other Operating Expenses | 375,182 | 276,691 | 212,184
Net Written Premiums | 7,467,813 | 7,196,160 | 5,939,375
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 | 1,253,110 | 559,932 | 319,479
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 | 274,288 | 202,999 | 195,423
Future Policy Benefits, Losses, Claims and Loss Expenses | 7,833,620 | 7,535,832 | 6,377,688
Unearned Premiums | 1,158,294 | 1,002,149 | 931,938
Premium Revenue | 3,090,792 | 2,770,227 | 2,608,298
Net Investment Income | 0 | 0 | 0
Benefits, Claims, Losses and Settlement Expenses | 799,905 | 2,044,771 | 2,163,016
Amortization of Deferred Policy Acquisition Costs | 600,127 | 547,210 | 487,178
Other Operating Expenses | 251,433 | 194,355 | 143,608
Net Written Premiums | 2,967,309 | 2,847,659 | 2,868,002
Casualty and Specialty | Operating Segments |  |  |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items] |  |  |
Deferred Policy Acquisition Costs | 1,477,149 | 968,739 | 653,737
Future Policy Benefits, Losses, Claims and Loss Expenses | 12,653,249 | 8,356,741 | 6,916,942
Unearned Premiums | 4,977,841 | 3,556,958 | 2,599,275
Premium Revenue | 4,380,341 | 3,563,762 | 2,585,883
Net Investment Income | 0 | 0 |
Benefits, Claims, Losses and Settlement Expenses | 2,773,604 | 2,294,069 | 1,713,071
Amortization of Deferred Policy Acquisition Costs | 1,274,907 | 1,021,396 | 727,680
Other Operating Expenses | 123,749 | 82,336 | 68,576
Net Written Premiums | $ 4,500,504 | $ 4,348,501 | $ 3,071,373

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