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Segment Information (Tables) | 12 Months Ended
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Dec. 31, 2012
Segment Reporting [Abstract] |
Revenue from Continuing Operations By Segment |
Revenue by Segment |  |  |  |  |  |
Years ended December 31, |  |  |  |  |  |
($ in thousands) |  | 2012 |  | 2011 |  | 2010
Standard Insurance Operations: |  |  |  |  |  |  |  |  |
Net premiums earned: |  |  |  |  |  |  |  |  |
Commercial automobile |  | $ | 288,010 |  |  | 279,610 |  |  | 291,495 |
Workers compensation |  | 262,108 |  |  | 259,354 |  |  | 252,441 |
General liability |  | 373,381 |  |  | 344,682 |  |  | 336,475 |
Commercial property |  | 202,340 |  |  | 192,989 |  |  | 199,252 |
Business owners’ policies |  | 68,462 |  |  | 66,225 |  |  | 65,260 |
Bonds |  | 18,891 |  |  | 18,910 |  |  | 19,243 |
Other |  | 12,143 |  |  | 9,177 |  |  | 10,116 |
Total standard Commercial Lines |  | 1,225,335 |  |  | 1,170,947 |  |  | 1,174,282 |
Personal automobile |  | 152,142 |  |  | 148,824 |  |  | 141,962 |
Homeowners |  | 113,850 |  |  | 102,764 |  |  | 87,862 |
Other |  | 13,563 |  |  | 12,864 |  |  | 12,492 |
Total standard Personal Lines |  | 279,555 |  |  | 264,452 |  |  | 242,316 |
Total Standard Insurance Operations net premiums earned |  | 1,504,890 |  |  | 1,435,399 |  |  | 1,416,598 |
Miscellaneous income |  | 8,827 |  |  | 8,069 |  |  | 9,230 |
Total Standard Insurance Operations revenue |  | 1,513,717 |  |  | 1,443,468 |  |  | 1,425,828 |
E&S Insurance Operations: |  |  |  |  |  |
Net premiums earned |  | 79,229 |  |  | 3,914 |  |  | — |
Investments: |  |  |  |  |  |  |  |  |
Net investment income |  | 131,877 |  |  | 147,443 |  |  | 145,708 |
Net realized gains (losses) on investments |  | 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 |
Other income |  | 291 |  |  | 410 |  |  | 168 |
Total revenues from continuing operations |  | $ | 1,734,102 |  |  | 1,597,475 |  |  | 1,564,621 |
Income From Continuing Operations, Before Federal Income Tax |
Income before federal income tax |  |  |  |  |  |
Years ended December 31, |  |  |  |  |  |
($ in thousands) |  | 2012 |  | 2011 |  | 2010
Standard Insurance Operations: |  |  |  |  |  |  |  |  |
Commercial Lines underwriting (loss) gain |  | $ | (40,935 | ) |  | (49,952 | ) |  | 180 |
Personal Lines underwriting loss |  | (3,514 | ) |  | (46,971 | ) |  | (20,154 | )
Total Standard Insurance Operations underwriting loss, before federal income tax |  | (44,449 | ) |  | (96,923 | ) |  | (19,974 | )
GAAP combined ratio |  | 103.0 | % |  | 106.8 |  |  | 101.4 |
Statutory combined ratio |  | 102.5 | % |  | 106.4 |  |  | 101.6 |
E&S Insurance Operations: |  |  |  |  |  |
Underwriting loss |  | (19,558 | ) |  | (6,661 | ) |  | — |
GAAP combined ratio |  | 124.7 | % |  | 270.2 |  |  | — |
Statutory combined ratio |  | 118.8 | % |  | 131.3 |  |  | — |
Investments: |  |  |  |  |  |  |  |  |
Net investment income |  | 131,877 |  |  | 147,443 |  |  | 145,708 |
Net realized gains (losses) on investments |  | 8,988 |  |  | 2,240 |  |  | (7,083 | )
Total investment income, before federal income tax |  | 140,865 |  |  | 149,683 |  |  | 138,625 |
Total all segments |  | 76,858 |  |  | 46,099 |  |  | 118,651 |
Interest expense |  | (18,872 | ) |  | (18,259 | ) |  | (18,616 | )
General corporate and other expenses |  | (20,351 | ) |  | (16,440 | ) |  | (15,886 | )
Income from continuing operations, before federal income tax |  | $ | 37,635 |  |  | 11,400 |  |  | 84,149 |

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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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