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Mortgage Loans on Real Estate (Schedule of Impaired Financing Receivables) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Financing Receivable, Impaired [Line Items]      
Mortgage loans with an allowance, recorded investment $ 13,305   $ 13,435
Mortgage loans with no related allowance, recorded investment 1,678   8,859
Impaired mortgage loans, recorded investment 14,983   22,294
Mortgage loans with an allowance, unpaid principal balance 19,055   21,277
Mortgage loans with no related allowance, unpaid principal balance 1,678   8,859
Impaired mortgage loans, unpaid principal balance 20,733   30,136
Mortgage loans with an allowance, related allowance (5,750)   $ (7,842)
Mortgage loans with an allowance, average recorded investment 13,999 $ 19,158  
Mortgage loans with no related allowance, average recorded investment 1,709 13,107  
Impaired mortgage loans, average recorded investment 15,708 32,265  
Mortgage loans with an allowance, interest income recognized 264 451  
Mortgage loans with no related allowance, interest income recognized 26 159  
Impaired mortgage loans, interest income reoognized $ 290 $ 610