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Investments (Narrative) (Details) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2017 USD ($) securities | Mar. 31, 2016 USD ($) | Dec. 31, 2016 USD ($) securities | Dec. 31, 2015 USD ($)
Investment Narrative [Line Items] |  |  |  |
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Cash | $ 30,500 |  | $ 28,800 |
Derivative Instruments, Gain Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing | 1,000 | $ 4,600 |  |
Net Amount Assets Liabilities From Repurchase Reverse Repurchase Agreements | 2,500 |  | 5,500 |
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held | $ 3,677 | 7,284 | $ 6,013 | $ 7,284
Policy Loans Percent Of Total Investments | 3.10% |  | 3.20% |
Mortgage Loan Percent Of Cash And Invested Assets | 8.50% |  | 8.40% |
Proceeds From Sale Of Available For Sale Securities Sold At Loss | $ 576,200 | 242,600 |  |
Available-for-sale Securities, Realized Losses, Excluding Other than Temporary Impairments | 12,563 | 11,787 |  |
Available-for-sale Securities, Gross Realized Gains | $ 17,893 | $ 27,192 |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | securities | 1,308 |  | 1,535 |
Securities As Percentage Of Consolidated Stockholder Equity | 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% |
Funds Withheld At Interest Percent Of Total Investments | 13.10% |  | 13.10% |
Funds withheld at interest | $ 5,943,450 |  | $ 5,875,919 |
Funds Held Under Reinsurance Agreements Asset Specific Client | $ 4,100,000 |  |  |
Other Invested Assets Percent Of Cash And Invested Assets | 3.10% |  | 3.60% |
CALIFORNIA |  |  |  |
Investment Narrative [Line Items] |  |  |  |
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total | 23.50% |  | 22.10% |

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