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Fair Value of Financial Instruments - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Fair Value of Financial Instruments (Textual) [Abstract] |  |  |  |
Net realized investment gains (losses) included in net income related to financial assets | $ 0 | $ (246) | $ 0 | $ (243)
Level 3 |  |  |  |
Fair Value of Financial Instruments (Textual) [Abstract] |  |  |  |
Percentage of invested assets in total investment portfolio Level 3 recurring | 4.00% |  | 4.00% |
Net realized investment losses | $ (371) | $ (1,291) | $ (4,705) | $ (3,513)

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- Definition Fair value of financial instruments. + References No definition available. + Details
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- Definition Percentage of invested assets in the total investment portfolio in Level 3 carried at fair value on a recurring basis. + 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 Amount of gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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