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Segment Information (Revenue by Segment) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Segment Reporting Information [Line Items]    
Total net premiums earned $ 591,828 $ 560,854
Other income 2,179 3,241
Net investment income 43,231 37,419
Net realized and unrealized investment losses (10,549) (1,045)
Total investment revenues 32,682 36,374
Total revenues 626,689 600,469
Standard Commercial Lines [Member]    
Segment Reporting Information [Line Items]    
Total net premiums earned 467,190 441,274
Other income 1,826 2,860
Standard Commercial Lines [Member] | Commercial Automobile [Member]    
Segment Reporting Information [Line Items]    
Total net premiums earned 118,231 107,129
Standard Commercial Lines [Member] | Workers Compensation [Member]    
Segment Reporting Information [Line Items]    
Total net premiums earned 78,823 79,326
Standard Commercial Lines [Member] | General Liability [Member]    
Segment Reporting Information [Line Items]    
Total net premiums earned 149,829 139,984
Standard Commercial Lines [Member] | Commercial Property [Member]    
Segment Reporting Information [Line Items]    
Total net premiums earned 80,326 76,391
Standard Commercial Lines [Member] | Business Owners' Policies [Member]    
Segment Reporting Information [Line Items]    
Total net premiums earned 25,591 24,845
Standard Commercial Lines [Member] | Bonds Segment [Member]    
Segment Reporting Information [Line Items]    
Total net premiums earned 8,134 6,498
Standard Commercial Lines [Member] | Other Commercial [Member]    
Segment Reporting Information [Line Items]    
Total net premiums earned 4,430 4,241
Standard Personal Lines [Member]    
Segment Reporting Information [Line Items]    
Total net premiums earned 74,608 71,582
Other income 352 381
Standard Personal Lines [Member] | Personal Automobile [Member]    
Segment Reporting Information [Line Items]    
Total net premiums earned 40,442 36,950
Standard Personal Lines [Member] | Homeowners [Member]    
Segment Reporting Information [Line Items]    
Total net premiums earned 32,201 32,700
Standard Personal Lines [Member] | Other Personal [Member]    
Segment Reporting Information [Line Items]    
Total net premiums earned 1,613 1,551
Excess And Surplus Operations [Member]    
Segment Reporting Information [Line Items]    
Total net premiums earned 52,209 51,239
Other income 1 0
Excess And Surplus Operations [Member] | General Liability [Member]    
Segment Reporting Information [Line Items]    
Total net premiums earned 38,540 37,912
Excess And Surplus Operations [Member] | Commercial Property [Member]    
Segment Reporting Information [Line Items]    
Total net premiums earned $ 13,668 $ 13,327