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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