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Fair Values of Financial Instruments (Narrative) (Details) (USD $) | 9 Months Ended |  |  |
--- | --- | --- | --- | ---
Sep. 30, 2013 | Oct. 22, 2013 | Aug. 26, 2013 | Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Assets, Level 1 to Level 2 transfers, amount | $ 0 |  |  |
Liabilities, Level 1 to Level 2 transfers, amount | 0 |  |  |
Assets, Level 2 to Level 1 transfers, amount | 0 |  |  |
Liabilities, Level 2 to Level 1 transfers, amount | 0 |  |  |
Assets, transfers into Level 3, amount | 0 |  |  |
Liabilities, transfers into Level 3, amount | 0 |  |  |
Assets, transfers out of Level 3, amount | 0 |  |  |
Liabilities, transfers out of Level 3, amount | 0 |  |  |
Other investments | 212,870,000 |  |  | 196,366,000
Percentage of outstanding call options and warrants settled pursuant to agreement |  | 50.00% | 50.00% |
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 |  |  |
Fixed index annuities embedded derivative, adjustment due to change in discount rate | (255,400,000) |  |  |
Deferred policy scquisition costs and deferred sales inducements, combined balance, adjustment due to change in discount rate | (155,200,000) |  |  |
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 |  |  |
Fixed index annuities embedded derivative, adjustment due to change in discount rate | 283,600,000 |  |  |
Deferred policy scquisition costs and deferred sales inducements, combined balance, adjustment due to change in discount rate | 168,800,000 |  |  |
Fair Value, Measurements, Recurring [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Other investments | $ 0 |  |  |

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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=7578670&loc=d3e19207-110258 + Details
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