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Segment Information (Revenue by Segment) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Segment Reporting Information [Line Items]        
Total net premiums earned $ 767,247 $ 694,541 $ 2,232,725 $ 1,976,915
Miscellaneous income 4,588 6,119 14,912 12,627
Net investment income 93,032 68,185 246,479 158,596
Net realized and unrealized investment gains (losses) 177 7,721 15,353 (24,296)
Total Investments revenue 93,209 75,906 261,832 134,300
Total revenues 865,044 776,566 2,509,469 2,123,842
Standard Commercial Lines        
Segment Reporting Information [Line Items]        
Miscellaneous income 4,168 5,521 13,670 11,107
Total revenues 623,739 563,606 1,822,136 1,586,776
Standard Commercial Lines | Commercial Property [Member]        
Segment Reporting Information [Line Items]        
Total net premiums earned 111,981 97,997 320,904 287,279
Standard Commercial Lines | Workers Compensation [Member]        
Segment Reporting Information [Line Items]        
Total net premiums earned 78,318 75,595 230,845 204,207
Standard Commercial Lines | General Liability [Member]        
Segment Reporting Information [Line Items]        
Total net premiums earned 205,904 181,459 596,717 509,312
Standard Commercial Lines | Commercial Automobile [Member]        
Segment Reporting Information [Line Items]        
Total net premiums earned 185,610 160,937 535,519 449,162
Standard Commercial Lines | Business Owners Policies [Member]        
Segment Reporting Information [Line Items]        
Total net premiums earned 23,025 27,605 80,963 82,157
Standard Commercial Lines | Bonds Segment [Member]        
Segment Reporting Information [Line Items]        
Total net premiums earned 8,850 9,226 26,436 28,075
Standard Commercial Lines | Other Commercial [Member]        
Segment Reporting Information [Line Items]        
Total net premiums earned 5,883 5,266 17,082 15,477
Standard Personal Lines        
Segment Reporting Information [Line Items]        
Miscellaneous income 420 598 1,242 1,520
Total revenues 73,782 76,574 221,718 225,257
Standard Personal Lines | Personal Automobile [Member]        
Segment Reporting Information [Line Items]        
Total net premiums earned 40,575 42,458 122,977 123,134
Standard Personal Lines | Homeowners [Member]        
Segment Reporting Information [Line Items]        
Total net premiums earned 30,633 31,395 91,801 94,537
Standard Personal Lines | Other Personal [Member]        
Segment Reporting Information [Line Items]        
Total net premiums earned 2,154 2,123 5,698 6,066
E&S Lines        
Segment Reporting Information [Line Items]        
Total revenues 74,314 60,480 203,783 177,509
E&S Lines | Casualty Insurance Product Line [Member]        
Segment Reporting Information [Line Items]        
Total net premiums earned 52,983 43,650 144,458 130,444
E&S Lines | Property Insurance [Member]        
Segment Reporting Information [Line Items]        
Total net premiums earned $ 21,331 $ 16,830 $ 59,325 $ 47,065