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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, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Segment Reporting Information [Line Items]        
Total net premiums earned $ 462,639 $ 437,568 $ 1,382,759 $ 1,284,760
Other income 3,196 3,357 14,931 9,677
Net investment income earned 34,292 32,457 106,600 99,330
Net realized investment gains 15,231 13,431 26,988 21,940
Total investment revenues 49,523 45,888 133,588 121,270
Total revenues from continuing operations 515,358 486,813 1,531,278 1,415,707
Commercial Automobile [Member]
        
Segment Reporting Information [Line Items]        
Total net premiums earned 83,536 79,138 249,224 230,191
Workers Compensation [Member]
        
Segment Reporting Information [Line Items]        
Total net premiums earned 66,732 66,510 205,137 197,449
General Liability [Member]
        
Segment Reporting Information [Line Items]        
Total net premiums earned 110,894 100,925 331,303 298,394
Commercial Property [Member]
        
Segment Reporting Information [Line Items]        
Total net premiums earned 61,304 57,004 182,716 165,356
Business Owners' Policies [Member]
        
Segment Reporting Information [Line Items]        
Total net premiums earned 21,649 19,629 63,797 56,794
Bonds Segment [Member]
        
Segment Reporting Information [Line Items]        
Total net premiums earned 4,791 4,705 14,281 14,244
Other Commercial [Member]
        
Segment Reporting Information [Line Items]        
Total net premiums earned 3,237 3,051 9,633 9,036
Total Standard Commercial Lines [Member]
        
Segment Reporting Information [Line Items]        
Total net premiums earned 352,143 330,962 1,056,091 971,464
Personal Automobile [Member]
        
Segment Reporting Information [Line Items]        
Total net premiums earned 37,695 38,513 113,943 115,432
Homeowners [Member]
        
Segment Reporting Information [Line Items]        
Total net premiums earned 33,957 32,374 100,831 95,211
Other Personal [Member]
        
Segment Reporting Information [Line Items]        
Total net premiums earned 2,725 3,827 8,965 10,655
Total Standard Personal Lines [Member]
        
Segment Reporting Information [Line Items]        
Total net premiums earned 74,377 74,714 223,739 221,298
Total Standard Insurance Operations [Member]
        
Segment Reporting Information [Line Items]        
Total net premiums earned 426,520 405,676 1,279,830 1,192,762
Total Standard insurance Operations revenues 429,716 409,018 1,294,753 1,202,352
Miscellaneous Income [Member]
        
Segment Reporting Information [Line Items]        
Other income 3,196 3,342 14,923 9,590
Excess And Surplus Operations [Member]
        
Segment Reporting Information [Line Items]        
Total net premiums earned 36,119 31,892 102,929 91,998
Operating Segments [Member]
        
Segment Reporting Information [Line Items]        
Total revenues from continuing operations 515,358 486,798 1,531,270 1,415,620
Other Income [Member]
        
Segment Reporting Information [Line Items]        
Other income $ 0 $ 15 $ 8 $ 87