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Investments - Impairment Charges in Earnings on Available-for-sale Securities (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items] |  |  |  |
Impairment charges recognized in earnings | $ 478 | $ 1,564 | $ 3,308 | $ 2,433
Equity Securities [Member] |  |  |  |
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items] |  |  |  |
Impairment charges recognized in earnings | 10 | 275 | 42 | 351
Investments in fixed-maturity securities not in default [Member] | Fixed-maturity Securities [Member] |  |  |  |
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items] |  |  |  |
Impairment charges recognized in earnings | 466 | 1,287 | 3,145 | 2,075
Investments in fixed-maturity securities in default [Member] | Fixed-maturity Securities [Member] |  |  |  |
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items] |  |  |  |
Impairment charges recognized in earnings | $ 2 | $ 2 | $ 121 | $ 7

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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 The amount of other than temporary impairment losses on investments in debt and equity securities categorized as Available-for-sale which have been recognized in earnings during the period. Such impairment losses consist of other than temporary impairments (OTTI) on equity securities, credit losses on investments in debt securities, and when the entity intends to sell an impaired debt security or it is more likely than not that the entity will be required to sell the impaired debt security before recovery of its amortized cost basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563 + Details
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