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Investments (Mortgage Loans by Method of Evaluation and Related Valuation Allowances) (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
Mortgage Loans: |  |  |  |
Recorded investment | $ 5,134,898 | $ 4,983,354 |  |
Valuation Allowances: |  |  |  |
Allowance for Loan and Lease Losses, Real Estate | 11,218 | 11,286 | $ 8,864 | $ 9,384
Commercial Real Estate Portfolio Segment [Member] |  |  |  |
Mortgage Loans: |  |  |  |
Evaluated individually for credit losses | 17,079 | 30,635 |  |
Evaluated collectively for credit losses | 5,117,819 | 4,952,719 |  |
Recorded investment | 5,134,898 | 4,983,354 |  |
Valuation Allowances: |  |  |  |
Specific for credit losses | 0 | 0 |  |
Non-specifically identified credit losses | 11,218 | 11,286 |  |
Allowance for Loan and Lease Losses, Real Estate | $ 11,218 | $ 11,286 |  |

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- Definition The reserve to cover probable credit losses related to specifically identified fixed maturity real estate loans as well as probable credit losses inherent in the remainder of that loan portfolio. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 310 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=82921503&loc=d3e21338-158488 + Details
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