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Segment Information (Revenue by Segment) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Segment Reporting Information [Line Items]    
Net premiums earned $ 902,336 $ 812,283
Other income 2,634 1,529
Net investment income earned 91,506 72,602
Net realized and unrealized investment gains (losses) 3,344 (40,352)
Total Investments revenue 94,850 32,250
Total revenues 999,820 846,062
Standard Commercial Lines    
Segment Reporting Information [Line Items]    
Total revenues 733,796 662,570
Standard Commercial Lines | General Liability [Member]    
Segment Reporting Information [Line Items]    
Net premiums earned 243,349 216,325
Standard Commercial Lines | Commercial Automobile [Member]    
Segment Reporting Information [Line Items]    
Net premiums earned 217,371 193,830
Standard Commercial Lines | Commercial Property [Member]    
Segment Reporting Information [Line Items]    
Net premiums earned 135,292 120,062
Standard Commercial Lines | Workers Compensation [Member]    
Segment Reporting Information [Line Items]    
Net premiums earned 84,184 84,680
Standard Commercial Lines | Business Owners Policies [Member]    
Segment Reporting Information [Line Items]    
Net premiums earned 33,171 30,044
Standard Commercial Lines | Bonds Segment [Member]    
Segment Reporting Information [Line Items]    
Net premiums earned 11,397 10,360
Standard Commercial Lines | Other Commercial [Member]    
Segment Reporting Information [Line Items]    
Net premiums earned 6,851 6,168
Standard Commercial Lines | Miscellaneous income    
Segment Reporting Information [Line Items]    
Other income 2,181 1,101
Standard Personal Lines    
Segment Reporting Information [Line Items]    
Total revenues 82,323 73,070
Standard Personal Lines | Personal Automobile [Member]    
Segment Reporting Information [Line Items]    
Net premiums earned 44,914 39,716
Standard Personal Lines | Homeowners [Member]    
Segment Reporting Information [Line Items]    
Net premiums earned 35,013 31,187
Standard Personal Lines | Other Personal [Member]    
Segment Reporting Information [Line Items]    
Net premiums earned 1,943 1,739
Standard Personal Lines | Miscellaneous income    
Segment Reporting Information [Line Items]    
Other income 453 428
E&S Lines    
Segment Reporting Information [Line Items]    
Total revenues 88,851 78,172
E&S Lines | Casualty Insurance Product Line [Member]    
Segment Reporting Information [Line Items]    
Net premiums earned 60,817 54,624
E&S Lines | Property Insurance [Member]    
Segment Reporting Information [Line Items]    
Net premiums earned $ 28,034 $ 23,548