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Investments - Net Investment Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Investment [Line Items]
Gross investment income	$ 31,885	$ 16,333	$ 69,041	$ 48,681
External investment expense	(175)	(46)	(265)	(151)
Net investment income	31,710	16,287	68,776	48,530
Fixed maturity securities, available-for-sale at fair value
Investment [Line Items]
Gross investment income	26,687	14,951	58,574	44,426
Equity securities
Investment [Line Items]
Gross investment income	1,501	578	2,763	1,827
Mortgage loans
Investment [Line Items]
Gross investment income	1,971	447	4,824	1,475
Policy loans
Investment [Line Items]
Gross investment income	316	289	873	878
Other invested assets
Investment [Line Items]
Gross investment income	$ 1,410	$ 68	$ 2,007	$ 75

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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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04.2)
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Amount of expenses related to the generation of investment income.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
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Amount, after 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

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