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Mortgage Loans on Real Estate (Narrative) (Details) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2014
loans
portfolio_segment
Jun. 30, 2013
loans
Jun. 30, 2014
loans
portfolio_segment
Jun. 30, 2013
loans
Dec. 31, 2013
Mortgage Loans on Real Estate [Abstract]          
Mortgage loans on real estate $ 2,543,810,000   $ 2,543,810,000   $ 2,581,082,000
Commitments outstanding 38,600,000   38,600,000    
Number of portfolio segments that make up financing receivables 1   1    
Number of mortgage loans satisfied by foreclosure 4 0 5 1  
Impaired mortgage loans, workout terms, interest only payments, six month terms     6 months    
Impaired mortgage loans, workout terms, interest only payments, twelve month terms     12 months    
Impaired mortgage loans, workout terms, cash flow sweep, number of months     12 months    
Number of days past due, delinquent status     60 days    
Number of days past due, non-accrual status     90 days    
Outstanding principal of loans in a non-accrual status $ 9,300,000   $ 9,300,000   $ 8,200,000