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Segment Information (Revenue From Continuing Operations by Segment) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Segment Reporting Information [Line Items]        
Total net premiums earned $ 426,252 $ 392,212 $ 847,192 $ 771,041
Other income 3,536 2,511 6,320 6,044
Net investment income 34,003 34,006 66,873 66,634
Net realized investment gains 5,154 178 8,509 4,536
Total investment revenues 39,157 34,184 75,382 71,170
Total all segments 468,937 428,834 928,822 848,106
Total revenues 468,945 428,907 928,894 848,255
Commercial Automobile [Member]
        
Segment Reporting Information [Line Items]        
Total net premiums earned 76,706 71,540 151,053 142,024
Workers Compensation [Member]
        
Segment Reporting Information [Line Items]        
Total net premiums earned 64,855 66,661 130,939 132,472
General Liability [Member]
        
Segment Reporting Information [Line Items]        
Total net premiums earned 99,766 92,632 197,469 182,775
Commercial Property [Member]
        
Segment Reporting Information [Line Items]        
Total net premiums earned 54,937 50,377 108,352 99,748
Business Owners' Policies [Member]
        
Segment Reporting Information [Line Items]        
Total net premiums earned 18,625 17,266 37,165 34,123
Bonds Segment [Member]
        
Segment Reporting Information [Line Items]        
Total net premiums earned 4,775 4,700 9,539 9,363
Other Commercial [Member]
        
Segment Reporting Information [Line Items]        
Total net premiums earned 2,993 3,113 5,985 6,281
Total standard Commercial Lines [Member]
        
Segment Reporting Information [Line Items]        
Total net premiums earned 322,657 306,289 640,502 606,786
Personal Automobile [Member]
        
Segment Reporting Information [Line Items]        
Total net premiums earned 38,526 37,897 76,919 75,353
Homeowners [Member]
        
Segment Reporting Information [Line Items]        
Total net premiums earned 31,702 28,808 62,837 56,766
Other Personal [Member]
        
Segment Reporting Information [Line Items]        
Total net premiums earned 3,320 3,251 6,828 6,446
Total standard Personal Lines [Member]
        
Segment Reporting Information [Line Items]        
Total net premiums earned 73,548 69,956 146,584 138,565
Total Standard Insurance Operations [Member]
        
Segment Reporting Information [Line Items]        
Total net premiums earned 396,205 376,245 787,086 745,351
Total insurance operations revenues 399,733 378,683 793,334 751,246
Miscellaneous Income [Member]
        
Segment Reporting Information [Line Items]        
Other income 3,528 2,438 6,248 5,895
Excess And Surplus Operations [Member]
        
Segment Reporting Information [Line Items]        
Total net premiums earned 30,047 15,967 60,106 25,690
Other Income [Member]
        
Segment Reporting Information [Line Items]        
Other income $ 8 $ 73 $ 72 $ 149