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Schedule III. Supplementary Insurance Information (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items] |  |  |
Deferred Policy Acquisition Costs | $ 849,160 | $ 633,521 | $ 663,991
Future Policy Benefits, Losses, Claims and Loss Expenses | 13,294,630 | 10,381,138 | 9,384,349
Unearned Premiums | 3,531,213 | 2,763,599 | 2,530,975
Premium Revenue | 5,194,181 | 3,952,462 | 3,338,403
Net Investment Income | 319,479 | 354,038 | 424,207
Benefits, Claims, Losses and Settlement Expenses | 3,876,087 | 2,924,609 | 2,097,021
Amortization of Deferred Policy Acquisition Costs | 1,214,858 | 897,677 | 762,232
Other Operating Expenses | 212,184 | 206,687 | 222,733
Net Written Premiums | 5,939,375 | 4,096,333 | 3,381,493
Property |  |  |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items] |  |  |
Deferred Policy Acquisition Costs | 195,423 | 118,327 | 79,795
Future Policy Benefits, Losses, Claims and Loss Expenses | 6,377,688 | 4,372,453 | 4,074,290
Unearned Premiums | 931,938 | 659,236 | 539,183
Premium Revenue | 2,608,298 | 1,936,215 | 1,627,494
Net Investment Income | 0 | 0 | 0
Benefits, Claims, Losses and Settlement Expenses | 2,163,016 | 1,435,947 | 965,384
Amortization of Deferred Policy Acquisition Costs | 487,178 | 353,700 | 313,554
Other Operating Expenses | 143,608 | 135,547 | 138,187
Net Written Premiums | 2,868,002 | 2,037,200 | 1,654,259
Casualty and Specialty |  |  |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items] |  |  |
Deferred Policy Acquisition Costs | 653,737 | 515,194 | 584,196
Future Policy Benefits, Losses, Claims and Loss Expenses | 6,916,942 | 6,008,685 | 5,310,059
Unearned Premiums | 2,599,275 | 2,104,363 | 1,991,792
Premium Revenue | 2,585,883 | 2,016,247 | 1,710,909
Net Investment Income |  | 0 | 0
Benefits, Claims, Losses and Settlement Expenses | 1,713,071 | 1,488,662 | 1,131,637
Amortization of Deferred Policy Acquisition Costs | 727,680 | 543,977 | 448,678
Other Operating Expenses | 68,576 | 71,140 | 84,546
Net Written Premiums | 3,071,373 | 2,059,133 | 1,727,234
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 | 319,479 | 354,038 | 424,207
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

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