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Segment Information (Revenue by Segment) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Segment Reporting Information [Line Items]        
Total net premiums earned $ 568,030 $ 531,932 $ 1,128,884 $ 1,054,390
Net investment income 41,430 31,182 78,849 61,951
Net realized investment gains (losses) 1,734 1,765 689 (939)
Total investment revenues 43,164 32,947 79,538 61,012
Other income 3,291 3,868 6,532 4,819
Total revenues 614,485 568,747 1,214,954 1,120,221
Standard Commercial Lines [Member]        
Segment Reporting Information [Line Items]        
Total net premiums earned 446,610 414,844 887,884 818,423
Standard Commercial Lines [Member] | Commercial Automobile [Member]        
Segment Reporting Information [Line Items]        
Total net premiums earned 108,316 98,896 215,445 194,315
Standard Commercial Lines [Member] | Workers Compensation [Member]        
Segment Reporting Information [Line Items]        
Total net premiums earned 79,460 75,251 158,786 151,251
Standard Commercial Lines [Member] | General Liability [Member]        
Segment Reporting Information [Line Items]        
Total net premiums earned 141,503 129,283 281,487 257,368
Standard Commercial Lines [Member] | Commercial Property [Member]        
Segment Reporting Information [Line Items]        
Total net premiums earned 78,052 73,591 154,443 143,769
Standard Commercial Lines [Member] | Business Owners' Policies [Member]        
Segment Reporting Information [Line Items]        
Total net premiums earned 24,989 24,651 49,834 48,555
Standard Commercial Lines [Member] | Bonds Segment [Member]        
Segment Reporting Information [Line Items]        
Total net premiums earned 6,986 5,665 13,484 11,129
Standard Commercial Lines [Member] | Other Commercial [Member]        
Segment Reporting Information [Line Items]        
Total net premiums earned 4,288 3,940 8,529 7,779
Standard Commercial Lines [Member] | Miscellaneous Income [Member]        
Segment Reporting Information [Line Items]        
Total net premiums earned 3,016 3,567 5,876 4,257
Standard Personal Lines [Member]        
Segment Reporting Information [Line Items]        
Total net premiums earned 71,947 71,125 143,529 141,590
Standard Personal Lines [Member] | Miscellaneous Income [Member]        
Segment Reporting Information [Line Items]        
Total net premiums earned 275 301 656 561
Standard Personal Lines [Member] | Personal Automobile [Member]        
Segment Reporting Information [Line Items]        
Total net premiums earned 37,663 35,881 74,613 71,661
Standard Personal Lines [Member] | Homeowners [Member]        
Segment Reporting Information [Line Items]        
Total net premiums earned 32,467 33,411 65,167 66,311
Standard Personal Lines [Member] | Other Personal [Member]        
Segment Reporting Information [Line Items]        
Total net premiums earned 1,542 1,532 3,093 3,057
Excess And Surplus Operations [Member]        
Segment Reporting Information [Line Items]        
Total net premiums earned 52,764 49,831 104,003 99,196
Excess And Surplus Operations [Member] | General Liability [Member]        
Segment Reporting Information [Line Items]        
Total net premiums earned 39,054 36,940 76,966 73,796
Excess And Surplus Operations [Member] | Commercial Property [Member]        
Segment Reporting Information [Line Items]        
Total net premiums earned 13,710 12,891 27,037 25,399
Excess And Surplus Operations [Member] | Miscellaneous Income [Member]        
Segment Reporting Information [Line Items]        
Total net premiums earned $ 0 $ 0 $ 0 $ 1