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Mortgage Loans on Real Estate (Schedule of Impaired Financing Receivables) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Financing Receivable, Impaired [Line Items]          
Mortgage loans with an allowance, recorded investment $ 3,356   $ 3,356   $ 13,435
Mortgage loans with no related allowance, recorded investment 1,621   1,621   8,859
Impaired mortgage loans, recorded investment 4,977   4,977   22,294
Mortgage loans with an allowance, unpaid principal balance 4,683   4,683   21,277
Mortgage loans with no related allowance, unpaid principal balance 1,621   1,621   8,859
Impaired mortgage loans, unpaid principal balance 6,304   6,304   30,136
Mortgage loans with an allowance, related allowance (1,327)   (1,327)   $ (7,842)
Mortgage loans with an allowance, average recorded investment 3,378 $ 17,336 3,420 $ 17,649  
Mortgage loans with no related allowance, average recorded investment 1,634 13,414 1,680 13,432  
Impaired mortgage loans, average recorded investment 5,012 30,750 5,100 31,081  
Mortgage loans with an allowance, interest income recognized 75 44 226 866  
Mortgage loans with no related allowance, interest income recognized 25 176 75 595  
Impaired mortgage loans, interest income reoognized $ 100 $ 220 $ 301 $ 1,461