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Segment Information (Tables) | 3 Months Ended
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Mar. 31, 2013
Segment Reporting [Abstract] |
Revenue from Continuing Operations By Segment |
Revenue by Segment |  | Quarter ended March 31,
($ in thousands) |  | 2013 |  | 2012
Standard Insurance Operations: |  |  |  |  |  |
Net premiums earned: |  |  |  |  |  |
Commercial automobile |  | $ | 74,347 |  |  | 70,484 |
Workers compensation |  | 66,084 |  |  | 65,811 |
General liability |  | 97,703 |  |  | 90,143 |
Commercial property |  | 53,415 |  |  | 49,371 |
Businessowners’ policies |  | 18,540 |  |  | 16,857 |
Bonds |  | 4,764 |  |  | 4,663 |
Other |  | 2,992 |  |  | 3,168 |
Total standard Commercial Lines |  | 317,845 |  |  | 300,497 |
Personal automobile |  | 38,393 |  |  | 37,456 |
Homeowners |  | 31,135 |  |  | 27,958 |
Other |  | 3,508 |  |  | 3,195 |
Total standard Personal Lines |  | 73,036 |  |  | 68,609 |
Total Standard Insurance Operations net premiums earned |  | 390,881 |  |  | 369,106 |
Miscellaneous income |  | 2,720 |  |  | 3,457 |
Total Standard Insurance Operations revenue |  | 393,601 |  |  | 372,563 |
E&S Insurance Operations: |  |  |  |
Net premiums earned |  | 30,059 |  |  | 9,723 |
Investments: |  |  |  |  |  |
Net investment income |  | 32,870 |  |  | 32,628 |
Net realized investment gains |  | 3,355 |  |  | 4,358 |
Total investment revenues |  | 36,225 |  |  | 36,986 |
Total all segments |  | 459,885 |  |  | 419,272 |
Other income |  | 64 |  |  | 76 |
Total revenues from continuing operations |  | $ | 459,949 |  |  | 419,348 |
Income From Continuing Operations, Before Federal Income Tax |
Income from Continuing Operations before Federal Income Tax |  | Quarter ended March 31,
($ in thousands) |  | 2013 |  | 2012
Standard Insurance Operations: |  |  |  |  |  |
Commercial Lines underwriting gain |  | $ | 6,102 |  |  | 409 |
Personal Lines underwriting gain |  | 5,973 |  |  | 3,121 |
Total Standard Insurance Operations underwriting gain, before federal income tax |  | 12,075 |  |  | 3,530 |
GAAP combined ratio |  | 96.9 | % |  | 99.0 |
Statutory combined ratio |  | 96.8 | % |  | 98.0 |
E&S Insurance Operations: |  |  |  |
Underwriting gain (loss) |  | 86 |  |  | (4,893 | )
GAAP combined ratio |  | 99.7 | % |  | 150.3 |
Statutory combined ratio |  | 98.2 | % |  | 120.3 |
Investments: |  |  |  |  |  |
Net investment income |  | 32,870 |  |  | 32,628 |
Net realized investment gains |  | 3,355 |  |  | 4,358 |
Total investment income, before federal income tax |  | 36,225 |  |  | 36,986 |
Total all segments |  | 48,386 |  |  | 35,623 |
Interest expense |  | (5,831 | ) |  | (4,700 | )
General corporate and other expenses |  | (13,687 | ) |  | (7,732 | )
Income from continuing operations before federal income tax |  | $ | 28,868 |  |  | 23,191 |

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- Definition Tabular disclosure of the revenue from continuing operations for each reportable segment, as a single block of text. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss. + References No definition available. + Details
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- Definition Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8736-108599 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8813-108599 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 131 -Paragraph 27, 28 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8906-108599 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8721-108599 + Details
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