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Fair Values of Financial Instruments (Narrative) (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 USD ($) Basis_Points | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets, Level 1 to Level 2 transfers, amount | $ 0 | $ 0 |
Liabilities, Level 1 to Level 2 transfers, amount | 0 | 0 |
Assets, Level 2 to Level 1 transfers, amount | 0 | 0 |
Liabilities, Level 2 to Level 1 transfers, amount | 0 | 0 |
Assets, transfers into Level 3, amount | 0 | 0 | $ 0
Liabilities, transfers into Level 3, amount | 0 | 0 | 0
Assets, transfers out of Level 3, amount | 0 | 0 | 0
Liabilities, transfers out of Level 3, amount | $ 0 | $ 0 | $ 0
Maximum | Measurement Input, Discount Rate |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value, sensitivity, discount rate adjustment (basis points) | Basis_Points | 100 |  |
Fixed index annuities embedded derivative, adjustment due to change in discount rate | $ (504,500) |  |
Deferred policy acquisition costs and deferred sales inducements, combined balance, adjustment due to change in discount rate | $ (423,500) |  |
Minimum | Measurement Input, Discount Rate |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value, sensitivity, discount rate adjustment (basis points) | Basis_Points | (100) |  |
Fixed index annuities embedded derivative, adjustment due to change in discount rate | $ 559,900 |  |
Deferred policy acquisition costs and deferred sales inducements, combined balance, adjustment due to change in discount rate | $ 291,800 |  |

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