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Segment Information (Tables) | 9 Months Ended
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Sep. 30, 2020
Segment Reporting [Abstract] |
Schedule of Revenue By Segment |
Revenue by Segment |  | Quarter ended September 30, |  | Nine Months ended September 30,
($ in thousands) |  | 2020 |  | 2019 |  | 2020 |  | 2019
Standard Commercial Lines: |  |  |  |  |  |  |  |
Net premiums earned: |  |  |  |  |  |  |  |
Commercial automobile |  | $ | 160,937 |  |  | 141,182 |  |  | 449,162 |  |  | 408,706 |
Workers compensation |  | 75,595 |  |  | 75,478 |  |  | 204,207 |  |  | 232,657 |
General liability |  | 181,459 |  |  | 169,084 |  |  | 509,312 |  |  | 495,402 |
Commercial property |  | 97,997 |  |  | 89,215 |  |  | 287,279 |  |  | 262,418 |
Businessowners policies |  | 27,605 |  |  | 26,371 |  |  | 82,157 |  |  | 78,624 |
Bonds |  | 9,226 |  |  | 8,990 |  |  | 28,075 |  |  | 26,861 |
Other |  | 5,266 |  |  | 4,841 |  |  | 15,477 |  |  | 14,326 |
Miscellaneous income |  | 5,521 |  |  | 2,782 |  |  | 11,107 |  |  | 7,544 |
Total Standard Commercial Lines revenue |  | 563,606 |  |  | 517,943 |  |  | 1,586,776 |  |  | 1,526,538 |
Standard Personal Lines: |  |  |  |  |  |  |  |
Net premiums earned: |  |  |  |  |  |  |  |
Personal automobile |  | 42,458 |  |  | 43,226 |  |  | 123,134 |  |  | 129,777 |
Homeowners |  | 31,395 |  |  | 31,529 |  |  | 94,537 |  |  | 95,672 |
Other |  | 2,123 |  |  | 1,983 |  |  | 6,066 |  |  | 5,709 |
Miscellaneous income |  | 598 |  |  | 380 |  |  | 1,520 |  |  | 991 |
Total Standard Personal Lines revenue |  | 76,574 |  |  | 77,118 |  |  | 225,257 |  |  | 232,149 |
E&S Lines: |  |  |  |  |  |  |  |
Net premiums earned: |  |  |  |  |  |  |  |
Casualty lines |  | 43,650 |  |  | 47,171 |  |  | 130,444 |  |  | 136,455 |
Property lines |  | 16,830 |  |  | 14,550 |  |  | 47,065 |  |  | 42,205 |
Total E&S Lines revenue |  | 60,480 |  |  | 61,721 |  |  | 177,509 |  |  | 178,660 |
Investments: |  |  |  |  |  |  |  |
Net investment income |  | 68,185 |  |  | 55,826 |  |  | 158,596 |  |  | 164,949 |
Net realized and unrealized investment gains (losses) |  | 7,721 |  |  | (2,183) |  |  | (24,296) |  |  | 15,295 |
Total Investments revenue |  | 75,906 |  |  | 53,643 |  |  | 134,300 |  |  | 180,244 |
Total revenues |  | $ | 776,566 |  |  | 710,425 |  |  | 2,123,842 |  |  | 2,117,591 |
Schedule of Income Before and After Federal Income Tax |
Income Before and After Federal Income Tax |  | Quarter ended September 30, |  | Nine Months ended September 30,
($ in thousands) |  | 2020 |  | 2019 |  | 2020 |  | 2019
Standard Commercial Lines: |  |  |  |  |  |  |  |
Underwriting gain, before federal income tax |  | $ | 42,718 |  |  | 30,016 |  |  | 76,574 |  |  | 92,974 |
Underwriting gain, after federal income tax |  | 33,746 |  |  | 23,713 |  |  | 60,493 |  |  | 73,450 |
Combined ratio |  | 92.3 | % |  | 94.2 |  |  | 95.1 |  |  | 93.9 |
ROE contribution |  | 5.7 |  |  | 4.5 |  |  | 3.5 |  |  | 5.0 |
Standard Personal Lines: |  |  |  |  |  |  |  |
Underwriting (loss) gain, before federal income tax |  | $ | (14,404) |  |  | (631) |  |  | (20,342) |  |  | 7,074 |
Underwriting (loss) gain, after federal income tax |  | (11,379) |  |  | (499) |  |  | (16,070) |  |  | 5,588 |
Combined ratio |  | 119.0 | % |  | 100.8 |  |  | 109.1 |  |  | 96.9 |
ROE contribution |  | (1.9) |  |  | (0.1) |  |  | (0.9) |  |  | 0.4 |
E&S Lines: |  |  |  |  |  |  |  |
Underwriting (loss) gain, before federal income tax |  | $ | (7,277) |  |  | 1,916 |  |  | (3,965) |  |  | 9,439 |
Underwriting (loss) gain, after federal income tax |  | (5,748) |  |  | 1,514 |  |  | (3,132) |  |  | 7,457 |
Combined ratio |  | 112.0 | % |  | 96.9 |  |  | 102.2 |  |  | 94.7 |
ROE contribution |  | (1.0) |  |  | 0.3 |  |  | (0.2) |  |  | 0.5 |
Investments: |  |  |  |  |  |  |  |
Net investment income |  | $ | 68,185 |  |  | 55,826 |  |  | 158,596 |  |  | 164,949 |
Net realized and unrealized investment gains (losses) |  | 7,721 |  |  | (2,183) |  |  | (24,296) |  |  | 15,295 |
Total investment segment income, before federal income tax |  | 75,906 |  |  | 53,643 |  |  | 134,300 |  |  | 180,244 |
Tax on investment segment income |  | 14,676 |  |  | 10,884 |  |  | 24,338 |  |  | 34,733 |
Total investment segment income, after federal income tax |  | $ | 61,230 |  |  | 42,759 |  |  | 109,962 |  |  | 145,511 |
ROE contribution of after-tax net investment income |  | 9.4 |  |  | 8.6 |  |  | 7.5 |  |  | 9.1 |
Schedule of Reconciliation of Segment Results to Income Before Federal Income Tax |
Reconciliation of Segment Results to Income Before Federal Income Tax |  | Quarter ended September 30, |  | Nine Months ended September 30,
($ in thousands) |  | 2020 |  | 2019 |  | 2020 |  | 2019
Underwriting gain |  |  |  |  |  |  |  |
Standard Commercial Lines |  | $ | 42,718 |  |  | 30,016 |  |  | 76,574 |  |  | 92,974 |
Standard Personal Lines |  | (14,404) |  |  | (631) |  |  | (20,342) |  |  | 7,074 |
E&S Lines |  | (7,277) |  |  | 1,916 |  |  | (3,965) |  |  | 9,439 |
Investment income |  | 75,906 |  |  | 53,643 |  |  | 134,300 |  |  | 180,244 |
Total all segments |  | 96,943 |  |  | 84,944 |  |  | 186,567 |  |  | 289,731 |
Interest expense |  | (7,781) |  |  | (7,397) |  |  | (23,310) |  |  | (26,289) |
Corporate expenses |  | (3,905) |  |  | (6,369) |  |  | (19,310) |  |  | (28,345) |
Income, before federal income tax |  | $ | 85,257 |  |  | 71,178 |  |  | 143,947 |  |  | 235,097 |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8813-108599 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8906-108599 + Details
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