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Investments - Maturities of Fixed Maturities (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018
Amortized Cost |  |
Due in 1 year or less | $ 205,798 |
Due after 1 year through 5 years | 1,541,749 |
Due after 5 years through 10 years | 1,613,539 |
Due after 10 years through 20 years | 1,393,503 |
Due after 20 years | 702,391 |
Amortized Cost | 5,456,980 | $ 7,373,911
Fair Value |  |
Due in 1 year or less | 211,420 |
Due after 1 year through 5 years | 1,587,300 |
Due after 5 years through 10 years | 1,712,236 |
Due after 10 years through 20 years | 1,512,769 |
Due after 20 years | 767,951 |
Total | $ 5,791,676 | $ 7,515,318
Percent of Total Fair Value |  |
Due in 1 year or less | 3.60% |
Due after 1 year through 5 years | 27.40% |
Due after 5 years through 10 years | 29.60% |
Due after 10 years through 20 years | 26.10% |
Due after 20 years | 13.30% |
Total | 100.00% |
Average option-adjusted duration, in years | 6 years |

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