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Investments - Fixed-maturity Securities Classified by Contractual Maturity Date (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017 | [2]
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Available-for-sale Securities, Debt Maturities [Abstract] |  |  |
Due in one year or less, amortized cost | $ 167,037 |  |
Due after one year through five years, amortized cost | 861,401 |  |
Due after five years through 10 years, amortized cost | 526,109 |  |
Due after 10 years, amortized cost | 51,371 |  |
Total fixed-maturity securities with single maturity dates, amortized cost | 1,605,918 |  |
Mortgage and asset-backed securities, amortized cost | 378,038 |  |
Available-for-sale debt securities, amortized cost basis | 1,983,956 | [1] | $ 1,877,326
Due in one year or less, fair value | 168,983 |  |
Due after one year through five years, fair value | 864,997 |  |
Due after five years through 10 years, fair value | 520,398 |  |
Due after 10 years, fair value | 54,540 |  |
Total fixed-maturity securities with single maturity dates, fair value | 1,608,918 |  |
Mortgage and asset-backed securities, fair value | 376,972 |  |
Available-for-sale debt securities, at fair value | $ 1,985,890 | [1] | $ 1,927,842
[1] | Includes $0.2 million of other-than-temporary impairment ("OTTI") losses related to corporates and mortgage- and asset-backed securities recognized in accumulated other comprehensive income (loss).
[2] | Includes $0.2 million of OTTI losses related to corporates and mortgage- and asset-backed securities recognized in accumulated other comprehensive income (loss).

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