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Segment Information (Revenue From Continuing Operations by Segment) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Segment Reporting Information [Line Items]                      
Total Net Premiums Earned $ 406,853 $ 406,225 $ 392,212 $ 378,829 $ 373,427 $ 358,963 $ 355,580 $ 351,343 $ 1,584,119 $ 1,439,313 $ 1,416,598
Other income                 9,118 8,479 9,398
Net investment income 34,593 30,650 34,006 32,628 28,839 35,786 39,345 43,473 131,877 147,443 145,708
Net realized (gains) losses                 8,988 2,240 (7,083)
Total investment revenues                 140,865 149,683 138,625
Total all segments                 1,733,811 1,597,065 1,564,453
Total revenues                 1,734,102 1,597,475 1,564,621
Commercial Automobile [Member]
                      
Segment Reporting Information [Line Items]                      
Total Net Premiums Earned                 288,010 279,610 291,495
Workers' Compensation [Member]
                      
Segment Reporting Information [Line Items]                      
Total Net Premiums Earned                 262,108 259,354 252,441
General Liability [Member]
                      
Segment Reporting Information [Line Items]                      
Total Net Premiums Earned                 373,381 344,682 336,475
Commercial Property [Member]
                      
Segment Reporting Information [Line Items]                      
Total Net Premiums Earned                 202,340 192,989 199,252
Business Owners' Policies [Member]
                      
Segment Reporting Information [Line Items]                      
Total Net Premiums Earned                 68,462 66,225 65,260
Bonds Segment [Member]
                      
Segment Reporting Information [Line Items]                      
Total Net Premiums Earned                 18,891 18,910 19,243
Other Commercial [Member]
                      
Segment Reporting Information [Line Items]                      
Total Net Premiums Earned                 12,143 9,177 10,116
Total standard Commercial Lines [Member]
                      
Segment Reporting Information [Line Items]                      
Total Net Premiums Earned                 1,225,335 1,170,947 1,174,282
Personal Automobile [Member]
                      
Segment Reporting Information [Line Items]                      
Total Net Premiums Earned                 152,142 148,824 141,962
Homeowners [Member]
                      
Segment Reporting Information [Line Items]                      
Total Net Premiums Earned                 113,850 102,764 87,862
Other Personal [Member]
                      
Segment Reporting Information [Line Items]                      
Total Net Premiums Earned                 13,563 12,864 12,492
Total standard Personal Lines [Member]
                      
Segment Reporting Information [Line Items]                      
Total Net Premiums Earned                 279,555 264,452 242,316
Total Standard Insurance Operations [Member]
                      
Segment Reporting Information [Line Items]                      
Total Net Premiums Earned                 1,504,890 1,435,399 1,416,598
Total Insurance Operations revenues                 1,513,717 1,443,468 1,425,828
Miscellaneous Income [Member]
                      
Segment Reporting Information [Line Items]                      
Other income                 8,827 [1] 8,069 [2] 9,230 [3]
Excess And Surplus Operations [Member]
                      
Segment Reporting Information [Line Items]                      
Total Net Premiums Earned                 79,229 3,914 0
Other Income [Member]
                      
Segment Reporting Information [Line Items]                      
Other income                 $ 291 $ 410 $ 168
[1] 4 In addition to amounts related to the Standard and E&S Insurance Operations segments, “Other income” and “Other expenses” on the Consolidated Statements of Income includes holding company income and expense amounts of $291 and $20,642, respectively.
[2] 4 In addition to amounts related to the Standard and E&S Insurance Operations segments, “Other income” and “Other expenses” on the Consolidated Statements of Income includes holding company income and expense amounts of $410 and $16,850, respectively.
[3] 3 In addition to amounts related to the Insurance Operations segment, “Other income” and “Other expenses” on the Consolidated Statements of Income includes holding company income and expense amounts of $168 and $16,054, respectively.