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Fair Values of Financial Instruments (Narrative) (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2015 USD ($) Basis_Points | Sep. 30, 2014 USD ($) | Sep. 30, 2015 USD ($) Basis_Points | Sep. 30, 2014 USD ($) | Dec. 31, 2014 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Assets, Level 1 to Level 2 transfers, amount | $ 0 |  | $ 0 |  | $ 0
Liabilities, Level 1 to Level 2 transfers, amount | 0 |  | 0 |  | 0
Assets, Level 2 to Level 1 transfers, amount | 0 |  | 0 |  | 0
Liabilities, Level 2 to Level 1 transfers, amount | 0 |  | 0 |  | 0
Assets, transfers into Level 3, amount | 0 | $ 0 | 0 | $ 0 |
Liabilities, transfers into Level 3, amount | 0 | 0 | 0 | 0 |
Assets, transfers out of Level 3, amount | 0 | 0 | 0 | 0 |
Liabilities, transfers out of Level 3, amount | 0 | $ 0 | 0 | $ 0 |
Other investments | 284,994 |  | 284,994 |  | $ 286,726
Fair Value, Measurements, Recurring [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Other investments | $ 0 |  | $ 0 |  |
Fair Value, Sensitivity, Increase in Discount Rate by 10 Percent [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair value, sensitivity, discount rate adjustment (basis points) | Basis_Points | 100 |  | 100 |  |
Fixed index annuities embedded derivative, adjustment due to change in discount rate |  |  | $ (383,900) |  |
Deferred policy scquisition costs and deferred sales inducements, combined balance, adjustment due to change in discount rate |  |  | $ (269,200) |  |
Fair Value, Sensitivity, Decrease in Discount Rate by 10 Percent [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair value, sensitivity, discount rate adjustment (basis points) | Basis_Points | 100 |  | 100 |  |
Fixed index annuities embedded derivative, adjustment due to change in discount rate |  |  | $ 429,300 |  |
Deferred policy scquisition costs and deferred sales inducements, combined balance, adjustment due to change in discount rate |  |  | $ 223,800 |  |

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