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Segment Information (Revenue by Segment) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Segment Reporting Information [Line Items]        
Total net premiums earned $ 740,518 $ 630,671 $ 1,465,478 $ 1,282,374
Miscellaneous income 6,212 4,683 10,324 6,508
Net investment income 83,731 34,444 153,447 90,411
Net realized and unrealized investment gains (losses) 10,057 12,649 15,176 (32,017)
Total Investments revenue 93,788 47,093 168,623 58,394
Total revenues 840,518 682,447 1,644,425 1,347,276
Standard Commercial Lines        
Segment Reporting Information [Line Items]        
Miscellaneous income 5,795 4,195 9,502 5,586
Total revenues 605,549 505,199 1,198,397 1,023,170
Standard Commercial Lines | Commercial Property [Member]        
Segment Reporting Information [Line Items]        
Total net premiums earned 106,113 95,413 208,923 189,282
Standard Commercial Lines | Workers Compensation [Member]        
Segment Reporting Information [Line Items]        
Total net premiums earned 74,337 61,906 152,527 128,612
Standard Commercial Lines | General Liability [Member]        
Segment Reporting Information [Line Items]        
Total net premiums earned 197,293 163,273 390,813 327,853
Standard Commercial Lines | Commercial Automobile [Member]        
Segment Reporting Information [Line Items]        
Total net premiums earned 178,028 138,535 349,909 288,225
Standard Commercial Lines | Business Owners Policies [Member]        
Segment Reporting Information [Line Items]        
Total net premiums earned 29,311 27,516 57,938 54,552
Standard Commercial Lines | Bonds Segment [Member]        
Segment Reporting Information [Line Items]        
Total net premiums earned 8,993 9,210 17,586 18,849
Standard Commercial Lines | Other Commercial [Member]        
Segment Reporting Information [Line Items]        
Total net premiums earned 5,679 5,151 11,199 10,211
Standard Personal Lines        
Segment Reporting Information [Line Items]        
Miscellaneous income 417 488 822 922
Total revenues 73,710 72,121 147,936 148,683
Standard Personal Lines | Personal Automobile [Member]        
Segment Reporting Information [Line Items]        
Total net premiums earned 41,009 38,189 82,402 80,676
Standard Personal Lines | Homeowners [Member]        
Segment Reporting Information [Line Items]        
Total net premiums earned 30,570 31,652 61,168 63,142
Standard Personal Lines | Other Personal [Member]        
Segment Reporting Information [Line Items]        
Total net premiums earned 1,714 1,792 3,544 3,943
E&S Lines        
Segment Reporting Information [Line Items]        
Total revenues 67,471 58,034 129,469 117,029
E&S Lines | Casualty Insurance Product Line [Member]        
Segment Reporting Information [Line Items]        
Total net premiums earned 47,642 42,722 91,475 86,794
E&S Lines | Property Insurance [Member]        
Segment Reporting Information [Line Items]        
Total net premiums earned $ 19,829 $ 15,312 $ 37,994 $ 30,235