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Investments - Schedule of Net Realized Investment Gains and Losses (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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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
Realized Investment Gains Losses [Abstract] |  |  |  |  |  |  |  |  |  |  |
Gross gains from sales of available-for-sale securities |  |  |  |  |  |  |  |  | $ 1,162 | $ 3,249 | $ 8,126
Gross losses from sales of available-for-sale securities |  |  |  |  |  |  |  |  | (965) | (107) | (751)
OTTI losses of available-for-sale securities |  |  |  |  |  |  |  |  | (152) | (1,553) | (3,420)
Net gains (losses) recognized in net income during the period on equity securities |  |  |  |  |  |  |  |  | (2,456) |  |
Gains (losses) from bifurcated options |  |  |  |  |  |  |  |  | 290 | (250) | 133
Net realized investment gains (losses), including other-than- temporary impairment losses | $ (1,651) | $ (126) | $ 1,313 | $ (1,656) | $ 1,079 | $ 22 | $ 104 | $ 134 | $ (2,121) | $ 1,339 | $ 4,088

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- Definition This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. + References No definition available. + Details
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- Definition This item represents the gross loss realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. + References No definition available. + Details
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- Definition Net Increase or Decrease in the fair value of the embedded derivative or group of embedded derivatives included in earnings in the period. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 15 -URI http://asc.fasb.org/subtopic&trid=2229187 + 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 No definition available. + Details
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- Definition The net realized gains or losses on investments during the period, not including gains or losses on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity. + 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 210.7-04.3(a)) -URI http://asc.fasb.org/extlink&oid=114873790&loc=SL114874131-224263 + Details
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