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Investments (Narrative) (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2015 USD ($) securities | Sep. 30, 2014 USD ($) | Sep. 30, 2015 USD ($) securities | Sep. 30, 2014 USD ($) | Jun. 30, 2015 USD ($) | Dec. 31, 2014 USD ($) securities | Jun. 30, 2014 USD ($) | Dec. 31, 2013 USD ($)
Investment Narrative [Line Items] |  |  |  |  |  |  |  |
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held | $ 7,284 |  | $ 7,284 |  | $ 7,284 | $ 7,284 | $ 7,284 | $ 11,696
Policy Loans Percent Of Total Investments | 3.70% |  | 3.70% |  |  | 3.50% |  |
Mortgage Loan To Value Ratio on Approval |  |  | 75.00% |  |  |  |  |
Mortgage Loan Percent Of Cash And Invested Assets | 8.10% |  | 8.10% |  |  | 7.40% |  |
Proceeds From Sale Of Available For Sale Securities Sold At Loss | $ 404,100 | $ 225,600 | $ 1,255,000 | $ 683,500 |  |  |  |
Available-for-sale Securities, Gross Realized Losses | $ 22,186 | $ 6,355 | $ 50,257 | $ 19,815 |  |  |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | securities | 1,640 |  | 1,640 |  |  | 932 |  |
Securities As Percentage Of Consolidated Stockholder Equity | 10.00% |  | 10.00% |  |  |  |  |
Securities Borrowed Or Pledged, Minimum Fair Value Percentage |  |  | 100.00% |  |  |  |  |
Minimum Collateral Balance of Cash Received Fair Value |  |  | 105.00% |  |  |  |  |
Collateral Obtained Percent Of Fair Value Reverse Repurchase Agreements |  |  | 100.00% |  |  |  |  |
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total | 100.00% |  | 100.00% |  |  | 100.00% |  |
Funds Withheld At Interest Percent Of Total Investments | 14.60% |  | 14.60% |  |  | 16.10% |  |
Funds withheld at interest | $ 5,675,174 |  | $ 5,675,174 |  |  | $ 5,922,561 |  |
Funds Held Under Reinsurance Agreements Asset Specific Client | $ 4,100,000 |  | $ 4,100,000 |  |  |  |  |
Other Invested Assets Percent Of Cash And Invested Assets | 3.00% |  | 3.00% |  |  | 3.30% |  |
Assets Sold under Agreements to Repurchase, Repurchase Liability |  |  |  |  |  | $ 101,400 |  |
Securities Sold under Agreements to Repurchase, Fair Value of Collateral | $ 0 |  | $ 0 |  |  | 107,158 |  |
Investment in mortgage loans |  |  |  |  |  |  |  |
Investment Narrative [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due | $ 0 |  | $ 0 |  |  | $ 0 |  |
CALIFORNIA |  |  |  |  |  |  |  |
Investment Narrative [Line Items] |  |  |  |  |  |  |  |
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total | 21.50% |  | 21.50% |  |  | 18.70% |  |

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