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Segment Information (Revenue by Segment) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Segment Reporting Information [Line Items]        
Total net premiums earned $ 531,932 $ 490,309 $ 1,054,390 $ 966,432
Net investment income 31,182 32,230 61,951 59,147
Net realized investment gains (losses) 1,765 (3,420) (939) 15,463
Total investment revenues 32,947 28,810 61,012 74,610
Other income 3,868 2,854 4,819 4,823
Total revenues 568,747 521,973 1,120,221 1,045,865
Standard Commercial Lines [Member]        
Segment Reporting Information [Line Items]        
Total net premiums earned 414,844 379,768 818,423 746,970
Standard Commercial Lines [Member] | Commercial Automobile [Member]        
Segment Reporting Information [Line Items]        
Total net premiums earned 98,896 88,658 194,315 175,013
Standard Commercial Lines [Member] | Workers Compensation [Member]        
Segment Reporting Information [Line Items]        
Total net premiums earned 75,251 70,954 151,251 139,431
Standard Commercial Lines [Member] | General Liability [Member]        
Segment Reporting Information [Line Items]        
Total net premiums earned 129,283 119,207 257,368 234,178
Standard Commercial Lines [Member] | Commercial Property [Member]        
Segment Reporting Information [Line Items]        
Total net premiums earned 73,591 66,549 143,769 131,112
Standard Commercial Lines [Member] | Business Owners' Policies [Member]        
Segment Reporting Information [Line Items]        
Total net premiums earned 24,651 23,178 48,555 45,877
Standard Commercial Lines [Member] | Bonds Segment [Member]        
Segment Reporting Information [Line Items]        
Total net premiums earned 5,665 5,106 11,129 10,106
Standard Commercial Lines [Member] | Other Commercial [Member]        
Segment Reporting Information [Line Items]        
Total net premiums earned 3,940 3,553 7,779 7,021
Standard Commercial Lines [Member] | Miscellaneous Income [Member]        
Segment Reporting Information [Line Items]        
Total net premiums earned 3,567 2,563 4,257 4,232
Standard Personal Lines [Member]        
Segment Reporting Information [Line Items]        
Total net premiums earned 71,125 72,362 141,590 145,141
Standard Personal Lines [Member] | Miscellaneous Income [Member]        
Segment Reporting Information [Line Items]        
Total net premiums earned 301 291 561 591
Standard Personal Lines [Member] | Personal Automobile [Member]        
Segment Reporting Information [Line Items]        
Total net premiums earned 35,881 36,740 71,661 73,750
Standard Personal Lines [Member] | Homeowners [Member]        
Segment Reporting Information [Line Items]        
Total net premiums earned 33,411 33,731 66,311 67,452
Standard Personal Lines [Member] | Other Personal [Member]        
Segment Reporting Information [Line Items]        
Total net premiums earned 1,532 1,600 3,057 3,348
Excess And Surplus Operations [Member]        
Segment Reporting Information [Line Items]        
Total net premiums earned 49,831 41,033 99,196 79,144
Excess And Surplus Operations [Member] | Commercial Automobile [Member]        
Segment Reporting Information [Line Items]        
Total net premiums earned 2,663 1,776 5,061 3,506
Excess And Surplus Operations [Member] | General Liability [Member]        
Segment Reporting Information [Line Items]        
Total net premiums earned 35,452 28,793 70,974 55,519
Excess And Surplus Operations [Member] | Commercial Property [Member]        
Segment Reporting Information [Line Items]        
Total net premiums earned 11,716 10,464 23,160 20,119
Excess And Surplus Operations [Member] | Miscellaneous Income [Member]        
Segment Reporting Information [Line Items]        
Total net premiums earned $ 0 $ 0 $ 1 $ 0