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Investments (Mortgage Loans by Method of Evaluation and Related Valuation Allowances) (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Mortgage Loans:    
Total mortgage loans $ 3,079,255 $ 2,718,709
Mortgage Loans on Real Estate, Commercial and Consumer, Net, (Investment Based Operations Presentation) [Abstract]    
Mortgage loans on real estate (net of valuation allowances) 3,073,313 2,712,238
Commercial Real Estate Portfolio Segment    
Mortgage Loans:    
Evaluated individually for credit losses 16,885 17,027
Evaluated collectively for credit losses 3,062,370 2,701,682
Total mortgage loans 3,079,255 2,718,709
Valuation Allowances:    
Specific for credit losses 671 816
Non-specifically identified credit losses 5,271 5,655
Total valuation allowances $ 5,942 $ 6,471