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Segment Information (Revenue From Continuing Operations by Segment) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Segment Reporting Information [Line Items]    
Total net premiums earned $ 378,829 $ 351,343
Other income 3,533 2,880
Total Insurance Operations revenues 382,286 354,113
Net investment income 32,628 43,473
Net realized gain on investments 4,358 5,760
Total investment income, before federal income tax 36,986 49,233
Total all segments 419,272 403,346
Total revenues 419,348 403,456
Commercial Automobile [Member]
    
Segment Reporting Information [Line Items]    
Total net premiums earned 70,484 69,670
Workers Compensation [Member]
    
Segment Reporting Information [Line Items]    
Total net premiums earned 65,811 62,526
General Liability [Member]
    
Segment Reporting Information [Line Items]    
Total net premiums earned 90,143 82,566
Commercial Property [Member]
    
Segment Reporting Information [Line Items]    
Total net premiums earned 49,371 48,193
Business Owners Policies [Member]
    
Segment Reporting Information [Line Items]    
Total net premiums earned 16,857 16,485
Bonds Segment [Member]
    
Segment Reporting Information [Line Items]    
Total net premiums earned 4,663 4,767
Other Commercial [Member]
    
Segment Reporting Information [Line Items]    
Total net premiums earned 12,891 2,556
Total Commercial Lines [Member]
    
Segment Reporting Information [Line Items]    
Total net premiums earned 310,220 286,763
Personal Automobile [Member]
    
Segment Reporting Information [Line Items]    
Total net premiums earned 37,456 36,962
Homeowners [Member]
    
Segment Reporting Information [Line Items]    
Total net premiums earned 27,958 24,555
Other Personal [Member]
    
Segment Reporting Information [Line Items]    
Total net premiums earned 3,195 3,063
Total Personal Lines [Member]
    
Segment Reporting Information [Line Items]    
Total net premiums earned 68,609 64,580
Miscellaneous Income [Member]
    
Segment Reporting Information [Line Items]    
Other income 3,457 2,770
Other Income [Member]
    
Segment Reporting Information [Line Items]    
Other income $ 76 $ 110