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Fair Values of Financial Instruments (Narrative) (Details) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2016 USD ($) Basis_Points | Mar. 31, 2015 USD ($) | Dec. 31, 2015 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 |
Liabilities, transfers into Level 3, amount | 0 | 0 |
Assets, transfers out of Level 3, amount | 0 | 0 |
Liabilities, transfers out of Level 3, amount | 0 | $ 0 |
Other investments | $ 290,556 |  | $ 291,530
Expected cost of annual call options | 3.10% |  | 3.10%
Mortality rate assumption | 65.00% |  |
Fair Value, Measurements, Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Other investments | $ 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 |  |
Fixed index annuities embedded derivative, adjustment due to change in discount rate | $ (441,000) |  |
Deferred policy scquisition costs and deferred sales inducements, combined balance, adjustment due to change in discount rate | $ (262,600) |  |
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 |  |
Fixed index annuities embedded derivative, adjustment due to change in discount rate | $ 494,300 |  |
Deferred policy scquisition costs and deferred sales inducements, combined balance, adjustment due to change in discount rate | $ 287,400 |  |

X
- 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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- Definition Amount of transfers of assets measured on a recurring basis out of Level 1 of the fair value hierarchy into Level 2. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bb) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Actuarially determined death rate of policyholders, which is included in determining the amount of the specified guaranteed benefit obligation as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section 55 -Paragraph 15 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6588021&loc=d3e7104-158389 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 80 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6484115&loc=d3e19393-158473 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6482852&loc=d3e14931-158439 + Details
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