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Fair Values of Financial Instruments (Narrative) (Details) (USD $) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013 | Dec. 31, 2013
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 | 221,459,000 |  | 221,459,000 |  | 215,042,000
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) | 100 |  | 100 |  |
Fixed index annuities embedded derivative, adjustment due to change in discount rate |  |  | (350,000,000) |  |
Deferred policy scquisition costs and deferred sales inducements, combined balance, adjustment due to change in discount rate |  |  | (209,200,000) |  |
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) | 100 |  | 100 |  |
Fixed index annuities embedded derivative, adjustment due to change in discount rate |  |  | 391,700,000 |  |
Deferred policy scquisition costs and deferred sales inducements, combined balance, adjustment due to change in discount rate |  |  | 230,400,000 |  |
Fair Value, Measurements, Recurring [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Other investments | $ 0 |  | $ 0 |  |

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 Item represents the number of basis points of change in the assumed discount rate utilized to determine the fair value of embedded derivatives. + References No definition available. + Details
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- Definition Amount of change in the fair value of fixed index embedded derivative liabilities due to a change in the discount rate. + 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=25499696&loc=d3e19207-110258 + Details
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- Definition Amount of transfers of assets measured on a recurring basis out of Level 2 of the fair value hierarchy into Level 1. + 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=25499696&loc=d3e19207-110258 + Details
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