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Segment Information (Revenue From Continuing Operations by Segment) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Segment Reporting Information [Line Items]        
Total net premiums earned $ 406,225 $ 358,963 $ 1,177,266 $ 1,065,886
Other income 1,085 1,365 7,129 6,744
Total insurance operations revenues 407,234 360,218 1,184,170 1,072,299
Net investment income 30,650 35,786 97,284 118,604
Net realized investment (losses) gains (1,088) (2,045) 3,448 5,861
Total investment revenues 29,562 33,741 100,732 124,465
Total all segments 436,796 393,959 1,284,902 1,196,764
Total revenues 436,872 394,069 1,285,127 1,197,095
Commercial Automobile [Member]
        
Segment Reporting Information [Line Items]        
Total net premiums earned 72,758 70,174 214,782 209,042
Workers Compensation [Member]
        
Segment Reporting Information [Line Items]        
Total net premiums earned 65,592 63,497 198,064 189,878
General Liability [Member]
        
Segment Reporting Information [Line Items]        
Total net premiums earned 93,763 87,479 276,538 255,717
Commercial Property [Member]
        
Segment Reporting Information [Line Items]        
Total net premiums earned 52,197 48,051 151,945 144,121
Business Owners' Policies [Member]
        
Segment Reporting Information [Line Items]        
Total net premiums earned 17,749 16,663 51,872 49,555
Bonds Segment [Member]
        
Segment Reporting Information [Line Items]        
Total net premiums earned 4,713 4,727 14,076 14,219
Other Commercial [Member]
        
Segment Reporting Information [Line Items]        
Total net premiums earned 27,648 1,772 59,619 6,889
Total Commercial Lines [Member]
        
Segment Reporting Information [Line Items]        
Total net premiums earned 334,420 292,363 966,896 869,421
Personal Automobile [Member]
        
Segment Reporting Information [Line Items]        
Total net premiums earned 38,295 37,371 113,648 111,522
Homeowners [Member]
        
Segment Reporting Information [Line Items]        
Total net premiums earned 29,919 25,923 86,685 75,538
Other Personal [Member]
        
Segment Reporting Information [Line Items]        
Total net premiums earned 3,591 3,306 10,037 9,405
Total Personal Lines [Member]
        
Segment Reporting Information [Line Items]        
Total net premiums earned 71,805 66,600 210,370 196,465
Miscellaneous Income [Member]
        
Segment Reporting Information [Line Items]        
Other income 1,009 1,255 6,904 6,413
Other Revenue [Member]
        
Segment Reporting Information [Line Items]        
Other income $ 76 $ 110 $ 225 $ 331