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Investments - Amortized Costs and Fair Value of Securities Classified as Trading Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
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Schedule Of Trading Securities And Other Trading Assets [Line Items] |  |  |
Total trading securities, Amortized cost |  | $ 23,090 | $ 6,172
Total trading securities, Fair value |  | 23,079 | 6,228
Fixed-maturity Securities [Member] |  |  |
Schedule Of Trading Securities And Other Trading Assets [Line Items] |  |  |
Total trading securities, Amortized cost |  | 23,090 | 4,801
Total trading securities, Fair value |  | $ 23,079 | 4,800
Equity Securities [Member] |  |  |
Schedule Of Trading Securities And Other Trading Assets [Line Items] |  |  |
Total trading securities, Amortized cost | [1] |  | 1,371
Total trading securities, Fair value | [1] |  | $ 1,428
[1] | Equity securities, previously classified as trading securities, are no longer classified as trading securities due to the adoption of ASU 2016-01. As of June 30, 2018, all equity security investments held by the Company are presented in the balance sheet as equity securities.

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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 + Details
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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. + Details
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