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Investments (Fixed Maturity Securities by Contractual Maturity) (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
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Available-for-sale Securities, Debt Maturities, Amortized Cost Basis [Abstract] |  |
Available for sale securities, due in one year or less, amortized cost | $ 257,926 |
Available for sale securities, due after one year through five years, amortized cost | 5,319,752 |
Available for sale securities, due after five years through ten years, amortized cost | 9,837,190 |
Available for sale securities, due after ten years through twenty years, amortized cost | 9,443,966 |
Available for sale securities, due after twenty years, amortized cost | 8,618,803 |
Available for sale securities, securities with a single maturity date, amortized cost | 33,477,637 |
Available for sale securities, amortized cost | 44,353,741 | $ 43,116,759
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] |  |
Available for sale securities, due in one year or less, fair value | 263,997 |
Available for sale securities, due after one year through five years, fair value | 5,332,148 |
Available for sale securities, due after five years through ten years, fair value | 9,714,831 |
Available for sale securities, due after ten years through twenty years, fair value | 9,881,974 |
Available for sale securities, due after twenty years, fair value | 8,743,172 |
Available for sale securities, securities with a single maturity date, fair value | 33,936,122 |
Available for sale securities, fair value | 44,799,370 | 45,372,989
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract] |  |
Held for investment securities, due in one year or less, amortized cost | 0 |
Held for investment securities, due after one year through five years, amortized cost | 0 |
Held for investment securities, due after five years through ten years, amortized cost | 0 |
Held for investment securities, due after ten years through twenty years, amortized cost | 0 |
Held for investment securities, due after twenty years, amortized cost | 77,155 |
Held for investment securities, securities with a single maturity date, amortized cost | 77,155 |
Held for investment, amortized cost | 77,155 | 77,041
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract] |  |
Held for investment securities, due in one year or less, fair value | 0 |
Held for investment securities, due after one year through five years, fair value | 0 |
Held for investment securities, due after five years through ten years, fair value | 0 |
Held for investment securities, due after ten years through twenty years, fair value | 0 |
Held for investment securities, due after twenty years, fair value | 68,108 |
Held for investment securities, securities with a single maturity date, fair value | 68,108 |
Held for investment | 68,108 | $ 76,460
Residential Mortgage Backed Securities [Member] |  |
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis [Abstract] |  |
Available for sale securities, securities without a single maturity date, amortized cost | 1,147,738 |
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] |  |
Available for sale securities, securities without a single maturity date, fair value | 1,207,606 |
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract] |  |
Held for investment securities, securities without a single maturity date, amortized cost | 0 |
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract] |  |
Held for investment securities, securities without a single maturity date, fair value | 0 |
Commercial Mortgage Backed Securities [Member] |  |
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis [Abstract] |  |
Available for sale securities, securities without a single maturity date, amortized cost | 5,426,483 |
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] |  |
Available for sale securities, securities without a single maturity date, fair value | 5,331,174 |
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract] |  |
Held for investment securities, securities without a single maturity date, amortized cost | 0 |
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract] |  |
Held for investment securities, securities without a single maturity date, fair value | 0 |
Other Asset Backed Securities [Member] |  |
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis [Abstract] |  |
Available for sale securities, securities without a single maturity date, amortized cost | 4,301,883 |
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] |  |
Available for sale securities, securities without a single maturity date, fair value | 4,324,468 |
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract] |  |
Held for investment securities, securities without a single maturity date, amortized cost | 0 |
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract] |  |
Held for investment securities, securities without a single maturity date, fair value | $ 0 |

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