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Segment Information (Revenue by Segment) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Segment Reporting Information [Line Items]    
Total net premiums earned $ 560,854 $ 522,458
Net investment income 37,419 30,769
Net realized investment losses (1,045) (2,704)
Total investment revenues 36,374 28,065
Other income 3,241 951
Total revenues 600,469 551,474
Standard Commercial Lines [Member]    
Segment Reporting Information [Line Items]    
Total net premiums earned 441,274 403,579
Standard Commercial Lines [Member] | Commercial Automobile [Member]    
Segment Reporting Information [Line Items]    
Total net premiums earned 107,129 95,419
Standard Commercial Lines [Member] | Workers Compensation [Member]    
Segment Reporting Information [Line Items]    
Total net premiums earned 79,326 76,000
Standard Commercial Lines [Member] | General Liability [Member]    
Segment Reporting Information [Line Items]    
Total net premiums earned 139,984 128,085
Standard Commercial Lines [Member] | Commercial Property [Member]    
Segment Reporting Information [Line Items]    
Total net premiums earned 76,391 70,178
Standard Commercial Lines [Member] | Business Owners' Policies [Member]    
Segment Reporting Information [Line Items]    
Total net premiums earned 24,845 23,904
Standard Commercial Lines [Member] | Bonds Segment [Member]    
Segment Reporting Information [Line Items]    
Total net premiums earned 6,498 5,464
Standard Commercial Lines [Member] | Other Commercial [Member]    
Segment Reporting Information [Line Items]    
Total net premiums earned 4,241 3,839
Standard Commercial Lines [Member] | Miscellaneous Income [Member]    
Segment Reporting Information [Line Items]    
Total net premiums earned 2,860 690
Standard Personal Lines [Member]    
Segment Reporting Information [Line Items]    
Total net premiums earned 71,582 70,465
Standard Personal Lines [Member] | Miscellaneous Income [Member]    
Segment Reporting Information [Line Items]    
Total net premiums earned 381 260
Standard Personal Lines [Member] | Personal Automobile [Member]    
Segment Reporting Information [Line Items]    
Total net premiums earned 36,950 35,780
Standard Personal Lines [Member] | Homeowners [Member]    
Segment Reporting Information [Line Items]    
Total net premiums earned 32,700 32,900
Standard Personal Lines [Member] | Other Personal [Member]    
Segment Reporting Information [Line Items]    
Total net premiums earned 1,551 1,525
Excess And Surplus Operations [Member]    
Segment Reporting Information [Line Items]    
Total net premiums earned 51,239 49,365
Excess And Surplus Operations [Member] | General Liability [Member]    
Segment Reporting Information [Line Items]    
Total net premiums earned 37,912 36,856
Excess And Surplus Operations [Member] | Commercial Property [Member]    
Segment Reporting Information [Line Items]    
Total net premiums earned 13,327 12,508
Excess And Surplus Operations [Member] | Miscellaneous Income [Member]    
Segment Reporting Information [Line Items]    
Total net premiums earned $ 0 $ 1