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Segment Information (Revenue From Continuing Operations by Segment) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Segment Reporting Information [Line Items]    
Total net premiums earned $ 420,940 $ 378,829
Other income 2,784 3,533
Net investment income 32,870 32,628
Net realized investment gains 3,355 4,358
Total investment revenues 36,225 36,986
Total all segments 459,885 419,272
Total revenues 459,949 419,348
Commercial Automobile [Member]
    
Segment Reporting Information [Line Items]    
Total net premiums earned 74,347 70,484
Workers Compensation [Member]
    
Segment Reporting Information [Line Items]    
Total net premiums earned 66,084 65,811
General Liability [Member]
    
Segment Reporting Information [Line Items]    
Total net premiums earned 97,703 90,143
Commercial Property [Member]
    
Segment Reporting Information [Line Items]    
Total net premiums earned 53,415 49,371
Business Owners' Policies [Member]
    
Segment Reporting Information [Line Items]    
Total net premiums earned 18,540 16,857
Bonds Segment [Member]
    
Segment Reporting Information [Line Items]    
Total net premiums earned 4,764 4,663
Other Commercial [Member]
    
Segment Reporting Information [Line Items]    
Total net premiums earned 2,992 3,168
Total standard Commercial Lines [Member]
    
Segment Reporting Information [Line Items]    
Total net premiums earned 317,845 300,497
Personal Automobile [Member]
    
Segment Reporting Information [Line Items]    
Total net premiums earned 38,393 37,456
Homeowners [Member]
    
Segment Reporting Information [Line Items]    
Total net premiums earned 31,135 27,958
Other Personal [Member]
    
Segment Reporting Information [Line Items]    
Total net premiums earned 3,508 3,195
Total standard Personal Lines [Member]
    
Segment Reporting Information [Line Items]    
Total net premiums earned 73,036 68,609
Total Standard Insurance Operations [Member]
    
Segment Reporting Information [Line Items]    
Total net premiums earned 390,881 369,106
Total insurance operations revenues 393,601 372,563
Miscellaneous Income [Member]
    
Segment Reporting Information [Line Items]    
Other income 2,720 3,457
Excess And Surplus Operations [Member]
    
Segment Reporting Information [Line Items]    
Total net premiums earned 30,059 9,723
Other Income [Member]
    
Segment Reporting Information [Line Items]    
Other income $ 64 $ 76