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Investments (Mortgage Loans by Method of Evaluation and Related Valuation Allowances) (Details) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2019 | Dec. 31, 2018
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Document Period End Date | Jun. 30, 2019 |
Mortgage Loans: |  |
Total mortgage loans | $ 5,424,145 | $ 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) | 5,405,422 | 4,966,298
Commercial Real Estate Portfolio Segment [Member] |  |
Mortgage Loans: |  |
Evaluated individually for credit losses | 17,014 | 30,635
Evaluated collectively for credit losses | 5,407,131 | 4,952,719
Total mortgage loans | 5,424,145 | 4,983,354
Valuation Allowances: |  |
Specific for credit losses | 0 | 0
Non-specifically identified credit losses | 11,692 | 11,286
Total valuation allowances | $ 11,692 | $ 11,286

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