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Investments (Narrative) (Details) $ in Thousands | 3 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2016 USD ($) securities | Jun. 30, 2015 USD ($) | Jun. 30, 2016 USD ($) securities | Jun. 30, 2015 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) securities | Mar. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Investment Narrative [Line Items] |  |  |  |  |  |  |  |
Proceeds From Sale Of Available For Sale Securities Sold At Loss | $ 343,300 | $ 651,300 | $ 585,800 | $ 850,900 |  |  |  |
Available-for-sale Securities, Realized Losses, Excluding Other than Temporary Impairments | 22,556 | 14,475 | 34,343 | 28,071 |  |  |  |
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held | 6,974 | 7,284 | 6,974 | 7,284 | $ 7,284 | $ 7,284 | $ 7,284 | $ 7,284
Financing Receivable, Recorded Investment, Past Due | $ 0 |  | $ 0 |  |  | $ 0 |  |
Policy Loans Percent Of Total Investments | 3.20% |  | 3.20% |  |  | 3.50% |  |
Mortgage Loan To Value Ratio on Approval |  |  | 75.00% |  |  |  |  |
Mortgage Loan Percent Of Cash And Invested Assets | 7.40% |  | 7.40% |  |  | 7.50% |  |
Available-for-sale Securities, Gross Realized Gains | $ 53,615 | $ 20,009 | $ 80,807 | $ 39,210 |  |  |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | securities | 908 |  | 908 |  |  | 2,080 |  |
Securities As Percentage Of Consolidated Stockholder Equity | 10.00% |  | 10.00% |  |  |  |  |
Securities Borrowed Or Pledged, Minimum Fair Value Percentage |  |  | 100.00% |  |  |  |  |
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 | 12.90% |  | 12.90% |  |  | 14.00% |  |
Funds withheld at interest | $ 5,899,289 |  | $ 5,899,289 |  |  | $ 5,880,203 |  |
Funds Held Under Reinsurance Agreements Asset Specific Client | $ 4,000,000 |  | $ 4,000,000 |  |  |  |  |
Other Invested Assets Percent Of Cash And Invested Assets | 3.70% |  | 3.70% |  |  | 3.10% |  |
CALIFORNIA |  |  |  |  |  |  |  |
Investment Narrative [Line Items] |  |  |  |  |  |  |  |
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total | 24.10% |  | 24.10% |  |  | 22.30% |  |

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