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Segment Information - Summary of Segment Activity (Details) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) segment | Jun. 30, 2017 USD ($) | Dec. 31, 2017 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |
Reportable segments | segment |  |  | 4 |  |
Operating segments | segment |  |  | 3 |  |
Summarized financial information for these segments |  |  |  |  |
Insurance premiums and contract charges earned | $ 205,610 | $ 195,718 | $ 408,608 | $ 391,440 |
Net investment income | 97,101 | 91,994 | 188,965 | 182,705 |
Net income (loss) | 5,917 | 2,261 | 26,072 | 17,579 |
Assets | 11,156,214 |  | 11,156,214 |  | $ 11,198,340
Intersegment eliminations |  |  |  |  |
Summarized financial information for these segments |  |  |  |  |
Net investment income | (194) | (204) | (391) | (412) |
Assets | (33,148) |  | (33,148) |  | (42,482)
Property and Casualty |  |  |  |  |
Summarized financial information for these segments |  |  |  |  |
Insurance premiums and contract charges earned | 167,333 | 160,460 | 332,791 | 318,778 |
Property and Casualty | Operating segments |  |  |  |  |
Summarized financial information for these segments |  |  |  |  |
Net investment income | 10,300 | 8,113 | 19,816 | 17,290 |
Net income (loss) | (10,896) | (13,956) | (1,174) | (11,221) |
Assets | 1,227,650 |  | 1,227,650 |  | 1,217,394
Retirement |  |  |  |  |
Summarized financial information for these segments |  |  |  |  |
Insurance premiums and contract charges earned | 7,825 | 6,759 | 15,893 | 13,360 |
Retirement | Operating segments |  |  |  |  |
Summarized financial information for these segments |  |  |  |  |
Net investment income | 67,787 | 65,139 | 131,956 | 128,581 |
Net income (loss) | 14,141 | 11,800 | 25,562 | 23,330 |
Assets | 8,033,572 |  | 8,033,572 |  | 8,063,912
Life |  |  |  |  |
Summarized financial information for these segments |  |  |  |  |
Insurance premiums and contract charges earned | 30,452 | 28,499 | 59,924 | 59,302 |
Life | Operating segments |  |  |  |  |
Summarized financial information for these segments |  |  |  |  |
Net investment income | 19,166 | 18,928 | 37,506 | 37,216 |
Net income (loss) | 5,879 | 5,610 | 9,666 | 9,495 |
Assets | 1,786,525 |  | 1,786,525 |  | 1,815,732
Corporate and Other |  |  |  |  |
Summarized financial information for these segments |  |  |  |  |
Net investment income | 42 | 18 | 78 | 30 |
Net income (loss) | (3,207) | $ (1,193) | (7,982) | $ (4,025) |
Assets | $ 141,615 |  | $ 141,615 |  | $ 143,784

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- Definition The sum of insurance premiums earned, premiums earned on the income statement for all insurance contracts after subtracting any amounts ceded to another insurer and adding premiums assumed from other insurers, plus contract charges earned on investment and universal life-type contracts. + References No definition available. + Details
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