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Mortgage Loans on Real Estate (Summary of Mortgage Loan Portfolio) (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Loans and Leases Receivable Disclosure [Line Items]      
Principal outstanding $ 2,490,619 $ 2,449,909 $ 2,457,721
Mortgage loans on real estate 2,480,956 2,435,257  
Commercial Real Estate Portfolio Segment [Member]      
Loans and Leases Receivable Disclosure [Line Items]      
Principal outstanding 2,490,619 2,449,909  
Loan loss allowance (8,427) (14,142)  
Deferred prepayment fees (1,236) (510)  
Mortgage loans on real estate $ 2,480,956 $ 2,435,257