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Schedule III - Supplementary Insurance Information (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items]      
Deferred policy acquisition costs $ 479,304 $ 424,864 $ 368,624
Reserve for loss and loss expense 6,589,801 5,336,911 5,144,821
Unearned premiums 2,616,268 2,330,656 1,992,781
Net premiums earned 4,376,447 3,827,606 3,373,380
Net investment income 454,102 385,098 173,347
Loss and loss expense incurred 3,164,484 2,484,285 2,111,778
Amortization of deferred policy acquisition costs 922,431 796,182 705,822
Other operating expenses 422,120 414,340 388,978
Net premiums written 4,630,001 4,134,532 3,573,590
Other insurance expenses 453,235 433,742 400,313
Other income (31,115) (19,402) (11,335)
Standard Commercial Lines      
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items]      
Deferred policy acquisition costs 389,992 350,198 311,535
Reserve for loss and loss expense 5,388,205 4,494,965 4,275,002
Unearned premiums 1,908,949 1,722,706 1,511,447
Net premiums earned 3,447,556 3,071,784 2,739,819
Net investment income 0 0 0
Loss and loss expense incurred 2,501,615 1,919,204 1,683,988
Amortization of deferred policy acquisition costs 764,662 674,374 605,845
Other operating expenses 326,262 320,900 306,290
Net premiums written 3,632,113 3,281,319 2,901,984
Standard Personal Lines      
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items]      
Deferred policy acquisition costs 23,374 24,759 17,817
Reserve for loss and loss expense 541,449 278,152 340,302
Unearned premiums 433,056 399,157 322,668
Net premiums earned 424,917 365,213 299,405
Net investment income 0 0 0
Loss and loss expense incurred 364,601 353,185 231,113
Amortization of deferred policy acquisition costs 46,487 36,001 27,129
Other operating expenses 53,314 55,290 48,356
Net premiums written 430,725 414,585 319,059
E&S Lines      
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items]      
Deferred policy acquisition costs 65,938 49,907 39,272
Reserve for loss and loss expense 660,147 563,794 529,517
Unearned premiums 274,263 208,793 158,666
Net premiums earned 503,974 390,609 334,156
Net investment income 0 0 0
Loss and loss expense incurred 298,268 211,896 196,677
Amortization of deferred policy acquisition costs 111,282 85,807 72,848
Other operating expenses 42,544 38,150 34,332
Net premiums written 567,163 438,628 352,547
Investments Segment      
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items]      
Deferred policy acquisition costs 0 0 0
Reserve for loss and loss expense 0 0 0
Unearned premiums 0 0 0
Net premiums earned 0 0 0
Net investment income 454,102 385,098 173,347
Loss and loss expense incurred 0 0 0
Amortization of deferred policy acquisition costs 0 0 0
Other operating expenses 0 0 0
Net premiums written $ 0 $ 0 $ 0