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Investments (Narrative) (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Dec. 31, 2018 USD ($)
Investment Narrative [Line Items] |  |  |  |  |
Document Period End Date |  |  | Sep. 30, 2019 |  |
Funds Held Under Reinsurance Agreements Asset Specific Client | $ 3,600,000 |  | $ 3,600,000 |  |
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held | 3,700 |  | 3,700 |  |
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Cash | 27,500 |  | 27,500 |  | $ 28,600
Net Amount Assets Liabilities From Repurchase Reverse Repurchase Agreements | 500 |  | 500 |  | $ 400
Proceeds From Sale Of Available For Sale Securities Sold At Loss | 1,313,700 | $ 1,345,300 | 3,026,500 | $ 3,783,300 |
Available-for-sale Securities, Realized Losses, Excluding Other than Temporary Impairments | $ 12,996 | 37,880 | $ 38,589 | 94,194 |
Policy Loans Percent Of Total Investments | 2.00% |  | 2.00% |  | 2.50%
Mortgage Loan Percent Of Cash And Invested Assets | 8.80% |  | 8.80% |  | 9.10%
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | 856 |  | 856 |  | 3,109
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 | 8.70% |  | 8.70% |  | 10.60%
Funds withheld at interest | $ 5,614,363 |  | $ 5,614,363 |  | $ 5,761,471
Other Invested Assets Percent Of Cash And Invested Assets | 3.40% |  | 3.40% |  | 3.50%
ProceedsFromSaleOfAvailableForSaleEquitySecuritiesSoldAtLoss |  |  |  | 31,500 |
Available-for-sale Equity Securities, Gross Unrealized Loss | $ 0 | $ 174 | $ 1 | $ 1,124 |
CALIFORNIA |  |  |  |  |
Investment Narrative [Line Items] |  |  |  |  |
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total | 17.00% |  | 17.00% |  |
TEXAS |  |  |  |  |
Investment Narrative [Line Items] |  |  |  |  |
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total | 12.90% |  | 12.90% |  |
WASHINGTON |  |  |  |  |
Investment Narrative [Line Items] |  |  |  |  |
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total | 7.40% |  | 7.40% |  |
CANADA |  |  |  |  |
Investment Narrative [Line Items] |  |  |  |  |
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total | 2.90% |  | 2.90% |  |
UNITED KINGDOM |  |  |  |  |
Investment Narrative [Line Items] |  |  |  |  |
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total | 0.50% |  | 0.50% |  |

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