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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
Deferred policy acquisition costs $ 326,915 $ 288,578 $ 271,186
Reserve for loss and loss expenses 4,580,903 4,260,355 4,067,163
Unearned premiums 1,803,207 1,618,271 1,523,167
Net premiums earned 3,017,253 2,681,814 2,597,171
Net investment income [1] 344,188 222,890 236,965
Loss and loss expense incurred 1,813,984 1,635,823 1,551,491
Amortization of deferred policy acquisition costs 626,469 560,271 535,973
Other operating expenses 358,208 [2] 349,371 [3] 345,714 [4]
Net premiums written 3,189,713 2,773,092 2,679,424
Other insurance expenses 375,931 366,941 358,069
Other income 17,723 17,570 12,355
Standard Commercial Lines [Member]      
Deferred policy acquisition costs 279,850 246,494 226,464
Reserve for loss and loss expenses 3,832,151 3,596,340 3,436,363
Unearned premiums 1,346,809 1,196,243 1,108,009
Net premiums earned 2,443,885 2,143,184 2,049,614
Net investment income 0 0 0
Loss and loss expense incurred 1,426,768 1,245,627 1,187,856
Amortization of deferred policy acquisition costs 539,606 474,322 445,661
Other operating expenses 278,915 271,504 270,107
Net premiums written 2,593,018 2,230,636 2,137,071
Other income 16,056 15,512 10,889
E&S Lines [Member]      
Deferred policy acquisition costs 34,154 28,281 27,874
Reserve for loss and loss expenses 478,686 435,667 406,600
Unearned premiums 139,122 113,845 106,033
Net premiums earned 279,809 239,490 239,818
Net investment income 0 0 0
Loss and loss expense incurred 175,100 156,936 152,335
Amortization of deferred policy acquisition costs 60,945 55,255 55,835
Other operating expenses 27,734 27,173 21,905
Net premiums written 304,430 247,290 237,761
Miscellaneous Income [Member]      
Other income 17,723 17,570 12,355
Standard Personal Lines      
Deferred policy acquisition costs 12,911 13,803 16,848
Reserve for loss and loss expenses 270,066 228,348 224,200
Unearned premiums 317,276 308,183 309,125
Net premiums earned 293,559 299,140 307,739
Net investment income 0 0 0
Loss and loss expense incurred 212,116 233,260 211,300
Amortization of deferred policy acquisition costs 25,918 30,694 34,477
Other operating expenses 51,559 50,694 53,702
Net premiums written 292,265 295,166 304,592
Other income 1,667 2,058 1,466
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] 344,188 222,890 236,965
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 gains (losses)” on the Consolidated Statements of Income.
[2] “Other operating expenses” of $358,208 reconciles to the Consolidated Statements of Income
[3] “Other operating expenses” of $349,371 reconciles to the Consolidated Statements of Income
[4] “Other operating expenses” of $345,714 reconciles to the Consolidated Statements of Income