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Investments - OTTI in Earnings on AFS Securities (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
OTTI recognized in earnings		$ 152	$ 1,553	$ 3,420
Fixed-maturity Securities [Member] | Investments in fixed-maturity securities not in default [Member]
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
OTTI recognized in earnings		$ 152	1,001	3,257
Fixed-maturity Securities [Member] | Investments in fixed-maturity securities in default [Member]
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
OTTI recognized in earnings			267	121
Equity Securities [Member]
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
OTTI recognized in earnings	[1]		$ 285	$ 42
[1] Subsequent to the adoption of ASU 2016-01 all changes in the fair value of equity securities are recognized in net income and thus OTTI no longer applies to equity securities.

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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.

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