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Investments (Narrative) (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 USD ($) securities | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) securities | Sep. 30, 2017 USD ($) | Dec. 31, 2017 USD ($) securities
Investment Narrative [Line Items] |  |  |  |  |
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Cash | $ 28,900 |  | $ 28,900 |  | $ 31,200
Net Amount Assets Liabilities From Repurchase Reverse Repurchase Agreements | 400 |  | 400 |  | $ 1,100
Proceeds From Sale Of Available For Sale Securities Sold At Loss | 1,345,300 | $ 479,700 | 3,783,300 | $ 1,604,700 |
Available-for-sale Securities, Realized Losses, Excluding Other than Temporary Impairments | $ 37,880 | 7,593 | $ 94,194 | 26,577 |
Policy Loans Percent Of Total Investments | 2.50% |  | 2.50% |  | 2.60%
Mortgage Loan Percent Of Cash And Invested Assets | 9.00% |  | 9.00% |  | 8.50%
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | securities | 2,866 |  | 2,866 |  | 1,116
Securities As Percentage Of Consolidated Stockholder Equity | 10.00% |  | 10.00% |  |
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 | 11.30% |  | 11.30% |  | 11.80%
Funds withheld at interest | $ 5,976,301 |  | $ 5,976,301 |  | $ 6,083,388
Funds Held Under Reinsurance Agreements Asset Specific Client | $ 3,900,000 |  | $ 3,900,000 |  |
Other Invested Assets Percent Of Cash And Invested Assets | 3.20% |  | 3.20% |  | 2.90%
ProceedsFromSaleOfAvailableForSaleEquitySecuritiesSoldAtLoss | $ 3,100 | 5,000 | $ 31,500 | 166,700 |
Available-for-sale Equity Securities, Gross Unrealized Loss | $ 174 | $ 85 | $ 1,124 | $ 4,135 |
CALIFORNIA |  |  |  |  |
Investment Narrative [Line Items] |  |  |  |  |
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total | 18.80% |  | 18.80% |  |
TEXAS |  |  |  |  |
Investment Narrative [Line Items] |  |  |  |  |
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total | 10.00% |  | 10.00% |  |
GEORGIA |  |  |  |  |
Investment Narrative [Line Items] |  |  |  |  |
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total | 7.50% |  | 7.50% |  |
CANADA |  |  |  |  |
Investment Narrative [Line Items] |  |  |  |  |
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total | 2.60% |  | 2.60% |  |

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