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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

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- Definition Amount, after premiums ceded to other entities and premiums assumed by the entity, of property and casualty premiums earned. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.1) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 1 -Article 7 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6486662&loc=d3e27175-158546 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 1 -Subparagraph (b),(c) -URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 + Details
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