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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, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Segment Reporting Information [Line Items]        
Total net premiums earned $ 463,625 $ 426,252 $ 920,120 $ 847,192
Other income 1,911 3,536 11,735 6,320
Net investment income earned 36,774 34,003 72,308 66,873
Net realized investment gains 4,539 5,154 11,757 8,509
Total investment revenues 41,313 39,157 84,065 75,382
Total all segments 506,846 468,937 1,015,912 928,822
Total revenues from continuing operations 506,849 468,945 1,015,920 928,894
Commercial Automobile [Member]
        
Segment Reporting Information [Line Items]        
Total net premiums earned 83,472 76,706 165,688 151,053
Workers Compensation [Member]
        
Segment Reporting Information [Line Items]        
Total net premiums earned 68,992 64,855 138,405 130,939
General Liability [Member]
        
Segment Reporting Information [Line Items]        
Total net premiums earned 111,591 99,766 220,409 197,469
Commercial Property [Member]
        
Segment Reporting Information [Line Items]        
Total net premiums earned 61,226 54,937 121,412 108,352
Business Owners' Policies [Member]
        
Segment Reporting Information [Line Items]        
Total net premiums earned 21,279 18,625 42,148 37,165
Bonds Segment [Member]
        
Segment Reporting Information [Line Items]        
Total net premiums earned 4,734 4,775 9,490 9,539
Other Commercial [Member]
        
Segment Reporting Information [Line Items]        
Total net premiums earned 3,213 2,993 6,396 5,985
Total Standard Commercial Lines [Member]
        
Segment Reporting Information [Line Items]        
Total net premiums earned 354,507 322,657 703,948 640,502
Personal Automobile [Member]
        
Segment Reporting Information [Line Items]        
Total net premiums earned 38,022 38,526 76,248 76,919
Homeowners [Member]
        
Segment Reporting Information [Line Items]        
Total net premiums earned 33,576 31,702 66,874 62,837
Other Personal [Member]
        
Segment Reporting Information [Line Items]        
Total net premiums earned 2,946 3,320 6,240 6,828
Total Standard Personal Lines [Member]
        
Segment Reporting Information [Line Items]        
Total net premiums earned 74,544 73,548 149,362 146,584
Total Standard Insurance Operations [Member]
        
Segment Reporting Information [Line Items]        
Total net premiums earned 429,051 396,205 853,310 787,086
Total Standard insurance Operations revenues 430,959 399,733 865,037 793,334
Miscellaneous Income [Member]
        
Segment Reporting Information [Line Items]        
Other income 1,908 3,528 11,727 6,248
Excess And Surplus Operations [Member]
        
Segment Reporting Information [Line Items]        
Total net premiums earned 34,574 30,047 66,810 60,106
Other Income [Member]
        
Segment Reporting Information [Line Items]        
Other income $ 3 $ 8 $ 8 $ 72