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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 Cost $ 861,609 $ 763,486 $ 676,145
Reserve for Losses and Loss Expenses 18,739,652 17,011,223 15,390,888
Unearned Premiums 5,922,326 5,297,654 4,847,160
Net Premiums Earned 10,400,687 9,561,429 8,106,031
Net Investment Income 1,052,835 779,185 671,618
Loss and Loss Expenses 6,372,142 5,861,750 4,953,960
Amortization of Deferred Policy Acquisition Cost 1,038,975 1,038,903 961,628
Other Operating Costs and Expenses 2,324,961 1,922,602 1,637,642
Net Premiums Written 10,954,467 10,004,070 8,862,867
Operating Segments | Insurance      
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items]      
Deferred Policy Acquisition Cost 748,134 651,257 566,718
Reserve for Losses and Loss Expenses 15,386,761 13,786,112 12,379,395
Unearned Premiums 5,367,137 4,779,214 4,348,171
Net Premiums Earned 9,130,324 8,369,062 7,077,708
Net Investment Income 793,998 550,084 468,821
Loss and Loss Expenses 5,689,263 5,130,909 4,326,403
Amortization of Deferred Policy Acquisition Cost 931,748 935,469 830,199
Other Operating Costs and Expenses 1,699,703 1,430,456 1,202,192
Net Premiums Written 9,657,121 8,784,146 7,743,814
Operating Segments | Reinsurance & Monoline Excess      
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items]      
Deferred Policy Acquisition Cost 113,475 112,229 109,427
Reserve for Losses and Loss Expenses 3,352,891 3,225,111 3,011,493
Unearned Premiums 555,189 518,440 498,989
Net Premiums Earned 1,270,363 1,192,367 1,028,323
Net Investment Income 211,628 194,272 175,324
Loss and Loss Expenses 682,879 730,841 627,557
Amortization of Deferred Policy Acquisition Cost 107,227 103,434 131,429
Other Operating Costs and Expenses 253,120 235,836 174,098
Net Premiums Written 1,297,346 1,219,924 1,119,053
Corporate, other and eliminations      
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items]      
Deferred Policy Acquisition Cost 0 0 0
Reserve for Losses and Loss Expenses 0 0 0
Unearned Premiums 0 0 0
Net Premiums Earned 0 0 0
Net Investment Income 47,209 34,829 27,473
Loss and Loss Expenses 0 0 0
Amortization of Deferred Policy Acquisition Cost 0 0 0
Other Operating Costs and Expenses 372,138 256,310 261,352
Net Premiums Written $ 0 $ 0 $ 0