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Investments - Net Investment Income (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Schedule of Net Investment Income, Reported Amounts, by Category [Line Items] |  |  |  |
Gross investment income, operating | $ 25,564 | $ 23,697 | $ 78,385 | $ 71,585
Investment expenses | (1,208) | (1,210) | (3,643) | (3,667)
Investment income net of investment expenses | 24,356 | 22,487 | 74,742 | 67,918
Interest expense on surplus note | (4,957) | (3,772) | (13,716) | (8,954)
Net investment income | 19,399 | 18,715 | 61,026 | 58,964
Equity Securities [Member] |  |  |  |
Schedule of Net Investment Income, Reported Amounts, by Category [Line Items] |  |  |  |
Gross investment income, operating | 505 | 514 | 1,527 | 1,533
Policy Loans and Other Invested Assets [Member] |  |  |  |
Schedule of Net Investment Income, Reported Amounts, by Category [Line Items] |  |  |  |
Gross investment income, operating | 318 | 354 | 998 | 1,049
Cash and Cash Equivalents [Member] |  |  |  |
Schedule of Net Investment Income, Reported Amounts, by Category [Line Items] |  |  |  |
Gross investment income, operating | 148 | 51 | 497 | 141
Market return on deposit asset underlying 10% insurance agreement [Member] |  |  |  |
Schedule of Net Investment Income, Reported Amounts, by Category [Line Items] |  |  |  |
Gross investment income, operating | 1,058 | 220 | 5,443 | 1,776
Available-for-Sale [Member] | Fixed-maturity Securities [Member] |  |  |  |
Schedule of Net Investment Income, Reported Amounts, by Category [Line Items] |  |  |  |
Gross investment income, operating | 18,578 | 18,786 | 56,204 | 58,132
Held-to-Maturity [Member] | Fixed-maturity Securities [Member] |  |  |  |
Schedule of Net Investment Income, Reported Amounts, by Category [Line Items] |  |  |  |
Gross investment income, operating | $ 4,957 | $ 3,772 | $ 13,716 | $ 8,954

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- Definition Amount, before investment expense, of income earned from investments in securities and real estate. Includes, but is not limited to, real estate investment, policy loans, dividends, and interest. Excludes realized gain (loss) on investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.2) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 + Details
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