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Segment Information (Revenue by Segment) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Segment Reporting Information [Line Items]        
Total net premiums earned $ 542,429 $ 507,390 $ 1,596,819 $ 1,473,822
Net investment income 33,375 32,061 95,326 91,208
Net realized investment gains 3,688 308 2,749 15,771
Total investment revenues 37,063 32,369 98,075 106,979
Other income 2,199 698 7,018 5,521
Total revenues 581,691 540,457 1,701,912 1,586,322
Standard Commercial Lines [Member]        
Segment Reporting Information [Line Items]        
Total net premiums earned 423,511 389,990 1,241,934 1,136,960
Standard Commercial Lines [Member] | Commercial Automobile [Member]        
Segment Reporting Information [Line Items]        
Total net premiums earned 100,612 90,758 294,927 265,771
Standard Commercial Lines [Member] | Workers Compensation [Member]        
Segment Reporting Information [Line Items]        
Total net premiums earned 78,596 74,560 229,847 213,991
Standard Commercial Lines [Member] | General Liability [Member]        
Segment Reporting Information [Line Items]        
Total net premiums earned 133,981 123,252 391,349 357,430
Standard Commercial Lines [Member] | Commercial Property [Member]        
Segment Reporting Information [Line Items]        
Total net premiums earned 74,052 68,587 217,821 199,699
Standard Commercial Lines [Member] | Business Owners' Policies [Member]        
Segment Reporting Information [Line Items]        
Total net premiums earned 24,461 23,726 73,016 69,603
Standard Commercial Lines [Member] | Bonds Segment [Member]        
Segment Reporting Information [Line Items]        
Total net premiums earned 5,795 5,031 16,924 15,137
Standard Commercial Lines [Member] | Other Commercial [Member]        
Segment Reporting Information [Line Items]        
Total net premiums earned 4,089 3,628 11,868 10,649
Standard Commercial Lines [Member] | Miscellaneous Income [Member]        
Segment Reporting Information [Line Items]        
Total net premiums earned 1,925 448 6,182 4,680
Standard Personal Lines [Member]        
Segment Reporting Information [Line Items]        
Total net premiums earned 68,965 72,338 210,555 217,479
Standard Personal Lines [Member] | Miscellaneous Income [Member]        
Segment Reporting Information [Line Items]        
Total net premiums earned 275 250 836 841
Standard Personal Lines [Member] | Personal Automobile [Member]        
Segment Reporting Information [Line Items]        
Total net premiums earned 34,865 36,623 106,526 110,373
Standard Personal Lines [Member] | Homeowners [Member]        
Segment Reporting Information [Line Items]        
Total net premiums earned 32,031 33,670 98,342 101,122
Standard Personal Lines [Member] | Other Personal [Member]        
Segment Reporting Information [Line Items]        
Total net premiums earned 1,794 1,795 4,851 5,143
Excess And Surplus Operations [Member]        
Segment Reporting Information [Line Items]        
Total net premiums earned 52,152 45,760 151,348 124,904
Excess And Surplus Operations [Member] | Commercial Automobile [Member]        
Segment Reporting Information [Line Items]        
Total net premiums earned 2,902 2,056 7,963 5,562
Excess And Surplus Operations [Member] | General Liability [Member]        
Segment Reporting Information [Line Items]        
Total net premiums earned 37,398 32,395 108,372 87,914
Excess And Surplus Operations [Member] | Commercial Property [Member]        
Segment Reporting Information [Line Items]        
Total net premiums earned 11,853 11,309 35,013 31,428
Excess And Surplus Operations [Member] | Miscellaneous Income [Member]        
Segment Reporting Information [Line Items]        
Total net premiums earned $ (1) $ 0 $ 0 $ 0