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Segment Information (Revenue by Segment) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Segment Reporting Information [Line Items]        
Net premiums earned $ 834,439 $ 740,518 $ 1,646,722 $ 1,465,478
Other income 3,037 6,212 4,566 10,324
Net investment income earned 70,222 83,731 142,824 153,447
Net realized and unrealized investment (losses) gains (42,880) 10,057 (83,232) 15,176
Total Investments revenue 27,342 93,788 59,592 168,623
Total revenues 864,818 840,518 1,710,880 1,644,425
Standard Commercial Lines        
Segment Reporting Information [Line Items]        
Total revenues 682,833 605,549 1,345,403 1,198,397
Standard Commercial Lines | Commercial Property [Member]        
Segment Reporting Information [Line Items]        
Net premiums earned 123,562 106,113 243,624 208,923
Standard Commercial Lines | Workers Compensation [Member]        
Segment Reporting Information [Line Items]        
Net premiums earned 83,502 74,337 168,182 152,527
Standard Commercial Lines | General Liability [Member]        
Segment Reporting Information [Line Items]        
Net premiums earned 226,285 197,293 442,610 390,813
Standard Commercial Lines | Commercial Automobile [Member]        
Segment Reporting Information [Line Items]        
Net premiums earned 198,381 178,028 392,211 349,909
Standard Commercial Lines | Business Owners Policies [Member]        
Segment Reporting Information [Line Items]        
Net premiums earned 31,508 29,311 61,552 57,938
Standard Commercial Lines | Bonds Segment [Member]        
Segment Reporting Information [Line Items]        
Net premiums earned 10,682 8,993 21,042 17,586
Standard Commercial Lines | Other Commercial [Member]        
Segment Reporting Information [Line Items]        
Net premiums earned 6,317 5,679 12,485 11,199
Standard Commercial Lines | Miscellaneous income        
Segment Reporting Information [Line Items]        
Other income 2,596 5,795 3,697 9,502
Standard Personal Lines        
Segment Reporting Information [Line Items]        
Total revenues 73,779 73,710 146,849 147,936
Standard Personal Lines | Personal Automobile [Member]        
Segment Reporting Information [Line Items]        
Net premiums earned 39,952 41,009 79,668 82,402
Standard Personal Lines | Homeowners [Member]        
Segment Reporting Information [Line Items]        
Net premiums earned 31,630 30,570 62,817 61,168
Standard Personal Lines | Other Personal [Member]        
Segment Reporting Information [Line Items]        
Net premiums earned 1,756 1,714 3,495 3,544
Standard Personal Lines | Miscellaneous income        
Segment Reporting Information [Line Items]        
Other income 441 417 869 822
E&S Lines        
Segment Reporting Information [Line Items]        
Total revenues 80,864 67,471 159,036 129,469
E&S Lines | Casualty Insurance Product Line [Member]        
Segment Reporting Information [Line Items]        
Net premiums earned 56,041 47,642 110,665 91,475
E&S Lines | Property Insurance [Member]        
Segment Reporting Information [Line Items]        
Net premiums earned $ 24,823 $ 19,829 $ 48,371 $ 37,994