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Investments - Costs and Fair Values of Fixed-Maturity and Equity Securities Classified as Trading Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Schedule Of Trading Securities And Other Trading Assets [Line Items]
Total trading securities, cost	$ 13,597	$ 6,172
Total trading securities, Fair value	13,610	6,228
Fixed-maturity Securities [Member]
Schedule Of Trading Securities And Other Trading Assets [Line Items]
Total trading securities, cost	13,597	4,801
Total trading securities, Fair value	$ 13,610	4,800
Equity Securities [Member]
Schedule Of Trading Securities And Other Trading Assets [Line Items]
Total trading securities, cost		1,371
Total trading securities, Fair value		$ 1,428

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Definition

Amount of investment in debt security measured at fair value with change in fair value recognized in net income (trading) and investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.4)
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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- Definition

Cost of investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading.

+ References

No definition available.

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