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Fair Value of Financial Instruments - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Percentage of investment portfolio fair value pricing services or index price | 90.70% | 90.70% |
Net realized investment gains (losses) | $ (13,410) | $ (5,076) | $ 2,529
Level 3 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Percentage of investment portfolio fair value pricing services or index price | 2.80% |  |
Realized loss on impairment of securities | $ 1,833 | 1,889 |
Net realized investment gains (losses) | $ 12,942 | $ 5,011 |

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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/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 + Details
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