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Segment Information (Tables) | 12 Months Ended
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Dec. 31, 2017
Segment Reporting [Abstract] |
Schedule of Revenue from Continuing Operations By Segment |
Revenue by Segment |  | Years ended December 31,
($ in thousands) |  | 2017 |  | 2016 |  | 2015
Standard Commercial Lines: |  |  |  |  |  |  |  |  |
Net premiums earned: |  |  |  |  |  |  |  |  |
Commercial automobile |  | $ | 442,818 |  |  | 398,942 |  |  | 358,909 |
Workers compensation |  | 317,982 |  |  | 308,233 |  |  | 290,075 |
General liability |  | 569,217 |  |  | 527,859 |  |  | 483,291 |
Commercial property |  | 311,932 |  |  | 293,438 |  |  | 269,022 |
Businessowners’ policies |  | 100,266 |  |  | 97,754 |  |  | 93,428 |
Bonds |  | 29,086 |  |  | 23,227 |  |  | 20,350 |
Other |  | 17,198 |  |  | 16,030 |  |  | 14,367 |
Miscellaneous income |  | 9,488 |  |  | 7,782 |  |  | 6,343 |
Total Standard Commercial Lines revenue |  | 1,797,987 |  |  | 1,673,265 |  |  | 1,535,785 |
Standard Personal Lines: |  |  |  |  |  |
Net premiums earned: |  |  |  |  |  |
Personal automobile |  | 153,147 |  |  | 142,876 |  |  | 146,784 |
Homeowners |  | 129,699 |  |  | 130,973 |  |  | 134,382 |
Other |  | 6,855 |  |  | 6,758 |  |  | 6,968 |
Miscellaneous income |  | 1,228 |  |  | 1,098 |  |  | 1,113 |
Total Standard Personal Lines revenue |  | 290,929 |  |  | 281,705 |  |  | 289,247 |
E&S Lines: |  |  |  |  |  |
Net premiums earned: |  |  |  |  |  |
Casualty lines |  | 157,366 |  |  | 151,638 |  |  | 126,064 |
Property lines |  | 55,461 |  |  | 51,844 |  |  | 46,269 |
Miscellaneous income |  | — |  |  | 1 |  |  | — |
Total E&S Lines revenue |  | 212,827 |  |  | 203,483 |  |  | 172,333 |
Investments: |  |  |  |  |  |  |  |  |
Net investment income |  | 161,882 |  |  | 130,754 |  |  | 121,316 |
Net realized investment gains (losses) |  | 6,359 |  |  | (4,937 | ) |  | 13,171 |
Total Investments revenues |  | 168,241 |  |  | 125,817 |  |  | 134,487 |
Total revenues |  | $ | 2,469,984 |  |  | 2,284,270 |  |  | 2,131,852 |
Schedule of Income from Continuing Operations before Federal Income Tax |
Income Before Federal Income Tax |  | Years ended December 31,
($ in thousands) |  | 2017 |  | 2016 |  | 2015
Standard Commercial Lines: |  |  |  |  |  |  |  |  |
Underwriting gain, before federal income tax |  | $ | 149,514 |  |  | 146,435 |  |  | 164,496 |
Underwriting gain, after federal income tax |  | 97,184 |  |  | 95,183 |  |  | 106,923 |
Combined ratio |  | 91.6 | % |  | 91.2 | % |  | 89.2 | %
Standard Personal Lines: |  |  |  |  |  |
Underwriting gain, before federal income tax |  | 11,104 |  |  | 12,419 |  |  | 1,336 |
Underwriting gain, after federal income tax |  | 7,217 |  |  | 8,072 |  |  | 868 |
Combined ratio |  | 96.2 | % |  | 95.6 | % |  | 99.5 | %
E&S Lines: |  |  |  |  |  |
Underwriting loss, before federal income tax |  | (6,282 | ) |  | (6,921 | ) |  | (16,803 | )
Underwriting loss, after federal income tax |  | (4,083 | ) |  | (4,499 | ) |  | (10,922 | )
Combined ratio |  | 103.0 | % |  | 103.4 | % |  | 109.8 | %
Investments: |  |  |  |  |  |  |  |  |
Net investment income |  | $ | 161,882 |  |  | 130,754 |  |  | 121,316 |
Net realized investment gains (losses) |  | 6,359 |  |  | (4,937 | ) |  | 13,171 |
Total investment income, before federal income tax |  | 168,241 |  |  | 125,817 |  |  | 134,487 |
Tax on investment income |  | 45,588 |  |  | 30,621 |  |  | 32,090 |
Total investment income, after federal income tax |  | $ | 122,653 |  |  | 95,196 |  |  | 102,397 |
Schedule of Reconciliation of Segment Results to Income From Continuing Operations, Before Federal Income Tax |
Reconciliation of Segment Results to Income Before Federal Income Tax |  | Years ended December 31,
($ in thousands) |  | 2017 |  | 2016 |  | 2015
Underwriting gain (loss) |  |  |  |  |  |
Standard Commercial Lines |  | $ | 149,514 |  |  | 146,435 |  |  | 164,496 |
Standard Personal Lines |  | 11,104 |  |  | 12,419 |  |  | 1,336 |
E&S Lines |  | (6,282 | ) |  | (6,921 | ) |  | (16,803 | )
Investment income |  | 168,241 |  |  | 125,817 |  |  | 134,487 |
Total all segments |  | 322,577 |  |  | 277,750 |  |  | 283,516 |
Interest expense |  | (24,354 | ) |  | (22,771 | ) |  | (22,428 | )
Corporate expenses |  | (36,255 | ) |  | (35,024 | ) |  | (28,396 | )
Income, before federal income tax |  | $ | 261,968 |  |  | 219,955 |  |  | 232,692 |

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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 30 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8906-108599 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=68060357&loc=d3e8813-108599 Reference 3: 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=68060357&loc=d3e8721-108599 Reference 4: 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=35741047&loc=d3e13816-109267 Reference 5: 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=68060357&loc=d3e8736-108599 + Details
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