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Fair Values of Financial Instruments (Narrative) (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 USD ($) Basis_Points | Dec. 31, 2019 USD ($) | Dec. 31, 2018 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, Level 3 transfers, amount, net | 0 | 0 | $ 0
Liabilities, Level 3 transfers, amount, net | $ 0 | $ 0 | $ 0
Expected cost of annual call options | 2.10% | 2.90% | 3.10%
Experience study on products with lifetime income benefit riders, period |  | 10 years |
Mean reversion period | 8 years | 20 years |
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 | $ (614,100) |  |
Deferred policy acquisition costs and deferred sales inducements, combined balance, adjustment due to change in discount rate | $ (258,300) |  |
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 | $ 639,000 |  |
Deferred policy acquisition costs and deferred sales inducements, combined balance, adjustment due to change in discount rate | $ 278,300 |  |

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- Definition Corresponding amount of change in the combined balance of deferred policy acquistion costs and deferred sales inducements due to a change in the discount rate utilized to determine the fair value of embedded derivatives. + References No definition available. + Details
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- Definition The expected cost of annual call options to be purchased in the future to fund index credits beyond the next policy anniversary date, which are based on estimated account value growth and historical review of our actual option costs. + References No definition available. + Details
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