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Segment Information (Revenue by Segment) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Segment Reporting Information [Line Items]        
Net premiums earned $ 981,917 $ 853,879 $ 2,826,403 $ 2,500,601
Other income 5,181 2,933 13,919 7,499
Net investment income earned 100,863 63,889 290,065 206,713
Net realized and unrealized investment gains (losses) (6,880) (25,681) (8,962) (108,913)
Total Investments revenue 93,983 38,208 281,103 97,800
Total revenues 1,081,081 895,020 3,121,425 2,605,900
Standard Commercial Lines        
Segment Reporting Information [Line Items]        
Total revenues 789,934 694,881 2,292,007 2,040,284
Standard Commercial Lines | General Liability [Member]        
Segment Reporting Information [Line Items]        
Net premiums earned 261,551 225,302 759,410 667,912
Standard Commercial Lines | Commercial Automobile [Member]        
Segment Reporting Information [Line Items]        
Net premiums earned 234,622 207,129 677,060 599,340
Standard Commercial Lines | Commercial Property [Member]        
Segment Reporting Information [Line Items]        
Net premiums earned 152,495 128,268 429,135 371,892
Standard Commercial Lines | Workers Compensation [Member]        
Segment Reporting Information [Line Items]        
Net premiums earned 81,672 81,996 254,602 250,178
Standard Commercial Lines | Businessowners' Policies [Member]        
Segment Reporting Information [Line Items]        
Net premiums earned 36,016 32,130 103,572 93,682
Standard Commercial Lines | Bonds Segment [Member]        
Segment Reporting Information [Line Items]        
Net premiums earned 11,715 11,094 34,731 32,136
Standard Commercial Lines | Other Commercial [Member]        
Segment Reporting Information [Line Items]        
Net premiums earned 7,257 6,518 21,142 19,003
Standard Commercial Lines | Miscellaneous income        
Segment Reporting Information [Line Items]        
Other income 4,606 2,444 12,355 6,141
Standard Personal Lines        
Segment Reporting Information [Line Items]        
Total revenues 95,744 76,127 265,773 222,976
Standard Personal Lines | Personal Automobile [Member]        
Segment Reporting Information [Line Items]        
Net premiums earned 51,906 40,746 145,050 120,414
Standard Personal Lines | Homeowners [Member]        
Segment Reporting Information [Line Items]        
Net premiums earned 40,175 32,619 112,090 95,436
Standard Personal Lines | Other Personal [Member]        
Segment Reporting Information [Line Items]        
Net premiums earned 3,088 2,273 7,069 5,768
Standard Personal Lines | Miscellaneous income        
Segment Reporting Information [Line Items]        
Other income 575 489 1,564 1,358
E&S Lines        
Segment Reporting Information [Line Items]        
Total revenues 101,420 85,804 282,542 244,840
E&S Lines | Casualty Insurance Product Line [Member]        
Segment Reporting Information [Line Items]        
Net premiums earned 67,718 59,640 190,686 170,305
E&S Lines | Property Insurance [Member]        
Segment Reporting Information [Line Items]        
Net premiums earned $ 33,702 $ 26,164 $ 91,856 $ 74,535