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Investments - Investment Income (Expense) Comprised Primarily of Interest and Dividends (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Net Investment Income [Line Items]
Total investment income									$ 27,776	$ 15,655	$ 11,746
Less: Investment expenses									(2,960)	(2,195)	(2,206)
Net investment income	$ 7,603	$ 6,642	$ 5,786	$ 4,785	$ 4,448	$ 3,085	$ 3,223	$ 2,704	24,816	13,460	9,540
Debt Securities
Net Investment Income [Line Items]
Investment income									18,198	12,375	9,523
Equity Securities
Net Investment Income [Line Items]
Investment income									2,978	1,799	1,414
Short-term investments
Net Investment Income [Line Items]
Investment income									145	22	75
Cash and Cash Equivalents
Net Investment Income [Line Items]
Investment income									4,331	981	325
Other
Net Investment Income [Line Items]
Investment income									$ 2,124	$ 478	$ 409

X

- 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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Represents the total of interest and dividend income, including any amortization and accretion (as applicable) of discounts and premiums, earned from (1) loans and leases whether held-for-sale or held-in-portfolio; (2) investment securities; (3) federal funds sold; (4) securities purchased under agreements to resell; (5) investments in banker's acceptances, commercial paper, or certificates of deposit; (6) dividend income; or (7) other investments not otherwise specified herein.

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Amount of expenses related to the generation of investment income.

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-Publisher FASB
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-Topic 220
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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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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