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Investments (Mortgage Loans by Method of Evaluation and Related Valuation Allowances) (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2019 | Dec. 31, 2018
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Document Period End Date | Sep. 30, 2019 |
Mortgage Loans: |  |
Total mortgage loans | $ 5,667,354 | $ 4,983,354
Mortgage Loans on Real Estate, Commercial and Consumer, Net, (Investment Based Operations Presentation) [Abstract] |  |
Mortgage loans on real estate (net of valuation allowances) | 5,647,265 | 4,966,298
Commercial Real Estate Portfolio Segment [Member] |  |
Mortgage Loans: |  |
Evaluated individually for credit losses | 17,016 | 30,635
Evaluated collectively for credit losses | 5,650,338 | 4,952,719
Total mortgage loans | 5,667,354 | 4,983,354
Valuation Allowances: |  |
Specific for credit losses | 0 | 0
Non-specifically identified credit losses | 11,775 | 11,286
Total valuation allowances | $ 11,775 | $ 11,286

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- Definition The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953423-111524 + Details
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