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Investments - Distribution of Fixed Maturity Securities by Expected Maturity (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2017 | Dec. 31, 2016
Percent of Total Fair Value |  |
Due in 1 year or less, Percent of Total Fair Value | 3.60% | 3.90%
Due after 1 year through 5 years, Percent of Total Fair Value | 27.40% | 28.70%
Due after 5 years through 10 years, Percent of Total Fair Value | 34.10% | 35.20%
Due after 10 years through 20 years, Percent of Total Fair Value | 22.80% | 19.50%
Due after 20 years, Percent of Total Fair Value | 12.10% | 12.70%
Total, Percent of Total Fair Value | 100.00% | 100.00%
Fair Value |  |
Due in 1 year or less, Fair Value | $ 275,005 |
Due after 1 year through 5 years, Fair Value | 2,079,595 |
Due after 5 years through 10 years, Fair Value | 2,580,296 |
Due after 10 years through 20 years, Fair Value | 1,729,382 |
Due after 20 years, Fair Value | 914,307 |
Total, Fair Value | 7,578,585 | $ 7,456,708
Amortized Cost |  |
Due in 1 year or less, Amortized Cost | 269,431 |
Due after 1 year through 5 years, Amortized Cost | 1,981,639 |
Due after 5 years through 10 years, Amortized Cost | 2,478,678 |
Due after 10 years through 20 years, Amortized Cost | 1,609,894 |
Due after 20 years, Amortized Cost | 822,275 |
Total, Amortized Cost | $ 7,161,917 | $ 7,152,127
Average option-adjusted duration, in years | 6 years | 5 years 10 months 25 days

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