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Mortgage Loans on Real Estate (Aging of Financing Receivables) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Mortgage Loans on Real Estate [Abstract]      
30 to 59 days $ 0 $ 0  
60 to 89 days 0 0  
90 days and over 0 0  
Total past due 0 0  
Current 2,599,524 2,624,163  
Collateral dependent receivables 8,174 34,720  
Principal outstanding $ 2,607,698 $ 2,658,883 $ 2,856,011