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Segment Information (Revenue by Segment) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Segment Reporting Information [Line Items]    
Total net premiums earned $ 522,458 $ 476,123
Net investment income 30,769 26,917
Net realized investment (losses) gains (2,704) 18,883
Total investment revenues 28,065 45,800
Other income 951 1,969
Total revenues 551,474 523,892
Standard Commercial Lines [Member]    
Segment Reporting Information [Line Items]    
Total net premiums earned 403,579 367,202
Standard Commercial Lines [Member] | Commercial Automobile [Member]    
Segment Reporting Information [Line Items]    
Total net premiums earned 95,419 86,355
Standard Commercial Lines [Member] | Workers Compensation [Member]    
Segment Reporting Information [Line Items]    
Total net premiums earned 76,000 68,477
Standard Commercial Lines [Member] | General Liability [Member]    
Segment Reporting Information [Line Items]    
Total net premiums earned 128,085 114,971
Standard Commercial Lines [Member] | Commercial Property [Member]    
Segment Reporting Information [Line Items]    
Total net premiums earned 70,178 64,563
Standard Commercial Lines [Member] | Business Owners' Policies [Member]    
Segment Reporting Information [Line Items]    
Total net premiums earned 23,904 22,699
Standard Commercial Lines [Member] | Bonds Segment [Member]    
Segment Reporting Information [Line Items]    
Total net premiums earned 5,464 5,000
Standard Commercial Lines [Member] | Other Commercial [Member]    
Segment Reporting Information [Line Items]    
Total net premiums earned 3,839 3,468
Standard Commercial Lines [Member] | Miscellaneous Income [Member]    
Segment Reporting Information [Line Items]    
Total net premiums earned 690 1,669
Standard Personal Lines [Member]    
Segment Reporting Information [Line Items]    
Total net premiums earned 70,465 72,779
Standard Personal Lines [Member] | Miscellaneous Income [Member]    
Segment Reporting Information [Line Items]    
Total net premiums earned 260 300
Standard Personal Lines [Member] | Personal Automobile [Member]    
Segment Reporting Information [Line Items]    
Total net premiums earned 35,780 37,010
Standard Personal Lines [Member] | Homeowners [Member]    
Segment Reporting Information [Line Items]    
Total net premiums earned 32,900 33,721
Standard Personal Lines [Member] | Other Personal [Member]    
Segment Reporting Information [Line Items]    
Total net premiums earned 1,525 1,748
Excess And Surplus Operations [Member]    
Segment Reporting Information [Line Items]    
Total net premiums earned 49,365 38,111
Excess And Surplus Operations [Member] | Commercial Automobile [Member]    
Segment Reporting Information [Line Items]    
Total net premiums earned 2,398 1,730
Excess And Surplus Operations [Member] | General Liability [Member]    
Segment Reporting Information [Line Items]    
Total net premiums earned 35,522 26,726
Excess And Surplus Operations [Member] | Commercial Property [Member]    
Segment Reporting Information [Line Items]    
Total net premiums earned 11,444 9,655
Excess And Surplus Operations [Member] | Miscellaneous Income [Member]    
Segment Reporting Information [Line Items]    
Total net premiums earned $ 1 $ 0