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Investments - Maturities of Fixed Maturities (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016
Amortized Cost |  |
Due in 1 year or less | $ 243,998 |
Due after 1 year through 5 years | 1,985,554 |
Due after 5 years through 10 years | 2,428,868 |
Due after 10 years through 20 years | 1,731,226 |
Due after 20 years | 913,304 |
Amortized Cost/Cost | 7,302,950 | $ 7,152,127
Fair Value |  |
Due in 1 year or less | 248,959 |
Due after 1 year through 5 years | 2,059,625 |
Due after 5 years through 10 years | 2,522,414 |
Due after 10 years through 20 years | 1,867,055 |
Due after 20 years | 1,026,022 |
Total | $ 7,724,075 | $ 7,456,708
Percent of Total Fair Value |  |
Due in 1 year or less | 3.20% |
Due after 1 year through 5 years | 26.70% |
Due after 5 years through 10 years | 32.60% |
Due after 10 years through 20 years | 24.20% |
Due after 20 years | 13.30% |
Total | 100.00% |
Average option-adjusted duration, in years | 5 years 10 months 24 days |

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