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Investments - Net Investment Income (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Schedule of Net Investment Income, Reported Amounts, by Category [Line Items] |  |  |  |  |
Gross investment income, operating |  | $ 31,187 | $ 27,134 | $ 60,251 | $ 53,988
Investment expenses |  | (2,105) | (1,305) | (3,779) | (2,546)
Investment income net of investment expenses |  | 29,082 | 25,829 | 56,472 | 51,442
Interest expense on surplus note |  | (9,052) | (6,087) | (17,425) | (11,806)
Net investment income |  | 20,030 | 19,742 | 39,047 | 39,636
Equity Securities [Member] |  |  |  |  |
Schedule of Net Investment Income, Reported Amounts, by Category [Line Items] |  |  |  |  |
Gross investment income, operating |  | 466 | 515 | 979 | 1,051
Policy Loans and Other Invested Assets [Member] |  |  |  |  |
Schedule of Net Investment Income, Reported Amounts, by Category [Line Items] |  |  |  |  |
Gross investment income, operating |  | 390 | 316 | 801 | 622
Cash and Cash Equivalents [Member] |  |  |  |  |
Schedule of Net Investment Income, Reported Amounts, by Category [Line Items] |  |  |  |  |
Gross investment income, operating |  | 641 | 246 | 1,227 | 439
Total 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] | 895 | 770 | 788 | 1,801
Available-for-Sale [Member] | Fixed-maturity Securities [Member] |  |  |  |  |
Schedule of Net Investment Income, Reported Amounts, by Category [Line Items] |  |  |  |  |
Gross investment income, operating |  | 19,743 | 19,200 | 39,031 | 38,269
Held-to-Maturity [Member] | Fixed-maturity Securities [Member] |  |  |  |  |
Schedule of Net Investment Income, Reported Amounts, by Category [Line Items] |  |  |  |  |
Gross investment income, operating |  | $ 9,052 | $ 6,087 | $ 17,425 | $ 11,806
[1] | Includes $0.4 million and $1.7 million of losses recognized for the change in fair value of the deposit asset underlying the 10% coinsurance agreement for the three and six months ended June 30, 2018, respectively. The change in fair value of the deposit asset underlying the 10% coinsurance agreement for the three and six months ended June 30, 2017 was not material.

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- Definition Amount, before investment expense, of income earned or loss recognized from investments in securities. Includes, but is not limited to, policy loans, dividends, and interest. Excludes realized gain (loss) on investments. + References No definition available. + Details
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