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Segment Information (Revenue by Segment) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Segment Reporting Information [Line Items]        
Net premiums earned $ 853,879 $ 767,247 $ 2,500,601 $ 2,232,725
Other income 2,933 4,588 7,499 14,912
Net investment income earned 63,889 93,032 206,713 246,479
Net realized and unrealized investment (losses) gains (25,681) 177 (108,913) 15,353
Total Investments revenue 38,208 93,209 97,800 261,832
Total revenues 895,020 865,044 2,605,900 2,509,469
Standard Commercial Lines        
Segment Reporting Information [Line Items]        
Total revenues 694,881 623,739 2,040,284 1,822,136
Standard Commercial Lines | General Liability [Member]        
Segment Reporting Information [Line Items]        
Net premiums earned 225,302 205,904 667,912 596,717
Standard Commercial Lines | Commercial Automobile [Member]        
Segment Reporting Information [Line Items]        
Net premiums earned 207,129 185,610 599,340 535,519
Standard Commercial Lines | Commercial Property [Member]        
Segment Reporting Information [Line Items]        
Net premiums earned 128,268 111,981 371,892 320,904
Standard Commercial Lines | Workers Compensation [Member]        
Segment Reporting Information [Line Items]        
Net premiums earned 81,996 78,318 250,178 230,845
Standard Commercial Lines | Business Owners Policies [Member]        
Segment Reporting Information [Line Items]        
Net premiums earned 32,130 23,025 93,682 80,963
Standard Commercial Lines | Bonds Segment [Member]        
Segment Reporting Information [Line Items]        
Net premiums earned 11,094 8,850 32,136 26,436
Standard Commercial Lines | Other Commercial [Member]        
Segment Reporting Information [Line Items]        
Net premiums earned 6,518 5,883 19,003 17,082
Standard Commercial Lines | Miscellaneous income        
Segment Reporting Information [Line Items]        
Other income 2,444 4,168 6,141 13,670
Standard Personal Lines        
Segment Reporting Information [Line Items]        
Total revenues 76,127 73,782 222,976 221,718
Standard Personal Lines | Personal Automobile [Member]        
Segment Reporting Information [Line Items]        
Net premiums earned 40,746 40,575 120,414 122,977
Standard Personal Lines | Homeowners [Member]        
Segment Reporting Information [Line Items]        
Net premiums earned 32,619 30,633 95,436 91,801
Standard Personal Lines | Other Personal [Member]        
Segment Reporting Information [Line Items]        
Net premiums earned 2,273 2,154 5,768 5,698
Standard Personal Lines | Miscellaneous income        
Segment Reporting Information [Line Items]        
Other income 489 420 1,358 1,242
E&S Lines        
Segment Reporting Information [Line Items]        
Total revenues 85,804 74,314 244,840 203,783
E&S Lines | Casualty Insurance Product Line [Member]        
Segment Reporting Information [Line Items]        
Net premiums earned 59,640 52,983 170,305 144,458
E&S Lines | Property Insurance [Member]        
Segment Reporting Information [Line Items]        
Net premiums earned $ 26,164 $ 21,331 $ 74,535 $ 59,325