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Investments (Narrative) (Details) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2018 USD ($) securities | Mar. 31, 2017 USD ($) | Dec. 31, 2017 USD ($) securities | Dec. 31, 2016 USD ($)
Investment Narrative [Line Items] |  |  |  |
Proceeds From Sale Of Available For Sale Securities Sold At Loss | $ 1,263,600 | $ 428,600 |  |
Sales of fixed maturity securities available-for-sale | 1,898,722 | 1,563,956 |  |
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Cash | 30,700 |  | $ 31,200 |
Derivative Instruments, Gain Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing | 2,400 | 1,000 |  |
Net Amount Assets Liabilities From Repurchase Reverse Repurchase Agreements | 400 |  | 1,100 |
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held | $ 3,677 | 3,677 | $ 3,677 | $ 6,013
Policy Loans Percent Of Total Investments | 2.60% |  | 2.60% |
Mortgage Loan Percent Of Cash And Invested Assets | 8.60% |  | 8.50% |
Available-for-sale Securities, Realized Losses, Excluding Other than Temporary Impairments | $ 20,380 | 8,687 |  |
Proceeds From Sale Of Available For Sale Equity Securities Sold At Loss | 28,400 | 147,600 |  |
Available-for-sale Equity Securities, Gross Unrealized Loss | 950 | 3,876 |  |
Available-for-sale Securities, Gross Realized Gains | $ 10,966 | 17,893 |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | securities | 2,114 |  | 1,116 |
Securities As Percentage Of Consolidated Stockholder Equity | 10.00% |  |  |
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total | 100.00% |  | 100.00% |
Funds Withheld At Interest Percent Of Total Investments | 11.70% |  | 11.80% |
Funds withheld at interest | $ 6,005,892 |  | $ 6,083,388 |
Funds Held Under Reinsurance Agreements Asset Specific Client | $ 4,000,000 |  |  |
Other Invested Assets Percent Of Cash And Invested Assets | 2.90% |  | 2.90% |
Gain (Loss) on Sale of Equity Investments | $ (4,137) | $ 0 |  |
CALIFORNIA |  |  |  |
Investment Narrative [Line Items] |  |  |  |
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total | 19.60% |  |  |
TEXAS |  |  |  |
Investment Narrative [Line Items] |  |  |  |
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total | 8.60% |  |  |
GEORGIA |  |  |  |
Investment Narrative [Line Items] |  |  |  |
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total | 7.50% |  |  |
CANADA |  |  |  |
Investment Narrative [Line Items] |  |  |  |
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total | 2.40% |  |  |

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