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Investments (Mortgage Loans by Method of Evaluation and Related Valuation Allowances) (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Mortgage Loans:    
Total mortgage loans $ 4,333,997 $ 3,783,207
Mortgage Loans on Real Estate, Commercial and Consumer, Net, (Investment Based Operations Presentation) [Abstract]    
Mortgage loans on real estate (net of valuation allowances) 4,322,329 3,775,522
Commercial Real Estate Portfolio Segment [Member]    
Mortgage Loans:    
Evaluated individually for credit losses 5,856 2,216
Evaluated collectively for credit losses 4,328,141 3,780,991
Total mortgage loans 4,333,997 3,783,207
Valuation Allowances:    
Specific for credit losses 0 0
Non-specifically identified credit losses 9,137 7,685
Total valuation allowances $ 9,137 $ 7,685