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Segment Information (Details) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2016 USD ($) segment location | Mar. 31, 2015 USD ($) | Dec. 31, 2015 USD ($)
Segment Reporting [Abstract] |  |  |
Number of business segments | segment | 2 |  |
Segment Reporting Information [Line Items] |  |  |
Net premiums earned | $ 241,298 | $ 213,171 |
Investment income, net of investment expenses | 22,224 | 24,363 |
Net realized investment gains (losses) | 2,055 | 887 |
Other income | 108 | 63 |
Total revenues | 265,685 | 238,484 |
Net income | 22,427 | 23,679 |
Assets | 3,975,992 | 3,864,251 | $ 3,890,376
Invested assets | $ 3,172,329 | 3,139,578 | $ 3,142,760
Property and Casualty Insurance [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Number of domestic locations | location | 7 |  |
Total revenues | $ 231,334 | 210,645 |
Net income | 22,020 | 23,103 |
Assets | 2,344,686 | 2,166,432 |
Invested assets | 1,675,088 | 1,562,710 |
Life Insurance [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 34,351 | 27,839 |
Net income | 407 | 576 |
Assets | 1,631,306 | 1,697,819 |
Invested assets | 1,497,241 | 1,576,868 |
Operating Segments [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net premiums earned | 241,298 | 213,365 |
Investment income, net of investment expenses | 22,261 | 24,346 |
Net realized investment gains (losses) | 2,055 | 887 |
Other income | 108 | 63 |
Total revenues | 265,722 | 238,661 |
Operating Segments [Member] | Property and Casualty Insurance [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net premiums earned | 220,225 | 200,137 |
Investment income, net of investment expenses | 9,409 | 10,730 |
Net realized investment gains (losses) | 1,737 | (239) |
Other income | 0 | 0 |
Total revenues | 231,371 | 210,628 |
Operating Segments [Member] | Life Insurance [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net premiums earned | 21,073 | 13,228 |
Investment income, net of investment expenses | 12,852 | 13,616 |
Net realized investment gains (losses) | 318 | 1,126 |
Other income | 108 | 63 |
Total revenues | 34,351 | 28,033 |
Intersegment Eliminations [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | (37) | (177) |
Intersegment Eliminations [Member] | Property and Casualty Insurance [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | (37) | 17 |
Intersegment Eliminations [Member] | Life Insurance [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | $ 0 | $ (194) |

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