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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