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Investments (Amortized Cost and Fair Value of Fixed Maturities by Contractual Maturities) (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Available For Sale Securities Debt Maturities Amortized Cost |  |
Due in one year or less | $ 986,289 |
Due after one year through five years | 7,797,732 |
Due after five year through ten years | 9,311,737 |
Due after ten years | 14,688,760 |
Asset and mortgage-backed securities | 4,966,614 |
Total | 37,751,132 | $ 35,281,412
Available For Sale Securities Debt Maturities Fair Value |  |
Due in one year or less | 993,352 |
Due after one year through five years | 7,888,116 |
Due after five year through ten years | 9,407,186 |
Due after ten years | 15,799,245 |
Asset and mortgage-backed securities | 4,917,313 |
Total | $ 39,005,212 | $ 38,150,820

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