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Schedule III - Supplementary Insurance Information (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Deferred policy acquisition costs $ 368,624 $ 326,915 $ 288,578
Reserve for loss and loss expenses 5,144,821 4,580,903 4,260,355
Unearned premiums 1,992,781 1,803,207 1,618,271
Net premiums earned 3,373,380 3,017,253 2,681,814
Net investment income [1] 173,347 344,188 222,890
Loss and loss expense incurred 2,111,778 1,813,984 1,635,823
Amortization of deferred policy acquisition costs 705,822 626,469 560,271
Other operating expenses 388,978 [2] 358,208 [3] 349,371 [4]
Net premiums written 3,573,590 3,189,713 2,773,092
Other insurance expenses 400,313 375,931 366,941
Other income 11,335 17,723 17,570
Standard Commercial Lines [Member]      
Deferred policy acquisition costs 311,535 279,850 246,494
Reserve for loss and loss expenses 4,275,002 3,832,151 3,596,340
Unearned premiums 1,511,447 1,346,809 1,196,243
Net premiums earned 2,739,819 2,443,885 2,143,184
Net investment income 0 0 0
Loss and loss expense incurred 1,683,988 1,426,768 1,245,627
Amortization of deferred policy acquisition costs 605,845 539,606 474,322
Other operating expenses 306,290 278,915 271,504
Net premiums written 2,901,984 2,593,018 2,230,636
Other income 9,519 16,056 15,512
E&S Lines [Member]      
Deferred policy acquisition costs 39,272 34,154 28,281
Reserve for loss and loss expenses 529,517 478,686 435,667
Unearned premiums 158,666 139,122 113,845
Net premiums earned 334,156 279,809 239,490
Net investment income 0 0 0
Loss and loss expense incurred 196,677 175,100 156,936
Amortization of deferred policy acquisition costs 72,848 60,945 55,255
Other operating expenses 34,332 27,734 27,173
Net premiums written 352,547 304,430 247,290
Miscellaneous Income [Member]      
Other income 11,335 17,723 17,570
Standard Personal Lines      
Deferred policy acquisition costs 17,817 12,911 13,803
Reserve for loss and loss expenses 340,302 270,066 228,348
Unearned premiums 322,668 317,276 308,183
Net premiums earned 299,405 293,559 299,140
Net investment income 0 0 0
Loss and loss expense incurred 231,113 212,116 233,260
Amortization of deferred policy acquisition costs 27,129 25,918 30,694
Other operating expenses 48,356 51,559 50,694
Net premiums written 319,059 292,265 295,166
Other income 1,816 1,667 2,058
Investments SIGI      
Deferred policy acquisition costs 0 0 0
Reserve for loss and loss expenses 0 0 0
Unearned premiums 0 0 0
Net premiums earned 0 0 0
Net investment income [1] 173,347 344,188 222,890
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
[1] Includes “Net investment income earned” and “Net realized and unrealized investment (losses) gains” on the Consolidated Statements of Income.
[2] “Other operating expenses” of $388,978 reconciles to the Consolidated Statements of Income
[3] “Other operating expenses” of $358,208 reconciles to the Consolidated Statements of Income
[4] “Other operating expenses” of $349,371 reconciles to the Consolidated Statements of Income