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Segment Information (Revenue by Segment) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Segment Reporting Information [Line Items]        
Net premiums earned $ 942,150 $ 834,439 $ 1,844,486 $ 1,646,722
Other income 6,104 3,037 8,738 4,566
Net investment income earned 97,696 70,222 189,202 142,824
Net realized and unrealized investment gains (losses) (5,426) (42,880) (2,082) (83,232)
Total Investments revenue 92,270 27,342 187,120 59,592
Total revenues 1,040,524 864,818 2,040,344 1,710,880
Standard Commercial Lines        
Segment Reporting Information [Line Items]        
Total revenues 768,277 682,833 1,502,073 1,345,403
Standard Commercial Lines | General Liability [Member]        
Segment Reporting Information [Line Items]        
Net premiums earned 254,510 226,285 497,859 442,610
Standard Commercial Lines | Commercial Automobile [Member]        
Segment Reporting Information [Line Items]        
Net premiums earned 225,067 198,381 442,438 392,211
Standard Commercial Lines | Commercial Property [Member]        
Segment Reporting Information [Line Items]        
Net premiums earned 141,348 123,562 276,640 243,624
Standard Commercial Lines | Workers Compensation [Member]        
Segment Reporting Information [Line Items]        
Net premiums earned 88,746 83,502 172,930 168,182
Standard Commercial Lines | Business Owners Policies [Member]        
Segment Reporting Information [Line Items]        
Net premiums earned 34,385 31,508 67,556 61,552
Standard Commercial Lines | Bonds Segment [Member]        
Segment Reporting Information [Line Items]        
Net premiums earned 11,619 10,682 23,016 21,042
Standard Commercial Lines | Other Commercial [Member]        
Segment Reporting Information [Line Items]        
Net premiums earned 7,034 6,317 13,885 12,485
Standard Commercial Lines | Miscellaneous income        
Segment Reporting Information [Line Items]        
Other income 5,568 2,596 7,749 3,697
Standard Personal Lines        
Segment Reporting Information [Line Items]        
Total revenues 87,706 73,779 170,029 146,849
Standard Personal Lines | Personal Automobile [Member]        
Segment Reporting Information [Line Items]        
Net premiums earned 48,230 39,952 93,144 79,668
Standard Personal Lines | Homeowners [Member]        
Segment Reporting Information [Line Items]        
Net premiums earned 36,902 31,630 71,915 62,817
Standard Personal Lines | Other Personal [Member]        
Segment Reporting Information [Line Items]        
Net premiums earned 2,038 1,756 3,981 3,495
Standard Personal Lines | Miscellaneous income        
Segment Reporting Information [Line Items]        
Other income 536 441 989 869
E&S Lines        
Segment Reporting Information [Line Items]        
Total revenues 92,271 80,864 181,122 159,036
E&S Lines | Casualty Insurance Product Line [Member]        
Segment Reporting Information [Line Items]        
Net premiums earned 62,151 56,041 122,968 110,665
E&S Lines | Property Insurance [Member]        
Segment Reporting Information [Line Items]        
Net premiums earned $ 30,120 $ 24,823 $ 58,154 $ 48,371