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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, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Segment Reporting Information [Line Items]                      
Net premiums earned $ 451,312 $ 437,568 $ 426,252 $ 420,940 $ 406,853 $ 406,225 $ 392,212 $ 378,829 $ 1,736,072 $ 1,584,119 $ 1,439,313
Other income                 12,294 9,118 8,479
Net investment income 35,313 32,457 34,003 32,870 34,593 30,650 34,006 32,628 134,643 131,877 147,443
Net realized (gains) losses                 20,732 8,988 2,240
Total investment revenues                 155,375 140,865 149,683
Total all segments                 1,903,648 1,733,811 1,597,065
Total revenues                 1,903,741 1,734,102 1,597,475
Commercial Automobile [Member]
                      
Segment Reporting Information [Line Items]                      
Net premiums earned                 310,994 288,010 279,610
Workers' Compensation [Member]
                      
Segment Reporting Information [Line Items]                      
Net premiums earned                 267,612 262,108 259,354
General Liability [Member]
                      
Segment Reporting Information [Line Items]                      
Net premiums earned                 405,322 373,381 344,682
Commercial Property [Member]
                      
Segment Reporting Information [Line Items]                      
Net premiums earned                 224,412 202,340 192,989
Business Owners' Policies [Member]
                      
Segment Reporting Information [Line Items]                      
Net premiums earned                 77,097 68,462 66,225
Bonds Segment [Member]
                      
Segment Reporting Information [Line Items]                      
Net premiums earned                 19,000 18,891 18,910
Other Commercial [Member]
                      
Segment Reporting Information [Line Items]                      
Net premiums earned                 12,182 12,143 9,177
Total standard Commercial Lines [Member]
                      
Segment Reporting Information [Line Items]                      
Net premiums earned                 1,316,619 1,225,335 1,170,947
Personal Automobile [Member]
                      
Segment Reporting Information [Line Items]                      
Net premiums earned                 152,005 152,142 148,824
Homeowners [Member]
                      
Segment Reporting Information [Line Items]                      
Net premiums earned                 127,991 113,850 102,764
Other Personal [Member]
                      
Segment Reporting Information [Line Items]                      
Net premiums earned                 14,336 13,563 12,864
Total standard Personal Lines [Member]
                      
Segment Reporting Information [Line Items]                      
Net premiums earned                 294,332 279,555 264,452
Total Standard Insurance Operations [Member]
                      
Segment Reporting Information [Line Items]                      
Net premiums earned                 1,610,951 1,504,890 1,435,399
Total Insurance Operations revenues                 1,623,152 1,513,717 1,443,468
Miscellaneous Income [Member]
                      
Segment Reporting Information [Line Items]                      
Other income                 12,201 [1] 8,827 [2] 8,069 [3]
Excess And Surplus Operations [Member]
                      
Segment Reporting Information [Line Items]                      
Net premiums earned                 125,121 79,229 3,914
Other Income [Member]
                      
Segment Reporting Information [Line Items]                      
Other income                 $ 93 $ 291 $ 410
[1] 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 $93 and $27,894, respectively.
[2] 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.
[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 $410 and $16,850, respectively.