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Mortgage Loans on Real Estate (Impaired Financing Receivables) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Financing Receivable, Impaired [Line Items]      
Mortgage loans with an allowance, recorded investment $ 13,435 $ 16,783  
Mortgage loans with no related allowance, recorded investment 8,859 2,656  
Impaired mortgage loans, recorded investment 22,294 19,439  
Mortgage loans with an allowance, unpaid principal balance 21,277 29,116  
Mortgage loans with no related allowance, unpaid principal balance 8,859 2,656  
Impaired mortgage loans, unpaid principal balance 30,136 31,772  
Mortgage loans with an allowance, related allowance (7,842) (12,333)  
Mortgage loans with an allowance, average recorded investment 13,893 18,465 $ 33,772
Mortgage loans with no related allowance, average recorded investment 8,930 2,656 3,264
Impaired mortgage loans, average recorded investment 22,823 21,121 37,036
Mortgage loans with an allowance, interest income recognized 1,117 1,797 2,094
Mortgage loans with no related allowance, interest income recognized 584 43 138
Impaired mortgage loans, interest income recognized $ 1,701 $ 1,840 $ 2,232