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Mortgage Loans on Real Estate (Mortgage Loans by Credit Quality Indicator) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Mortgage Loans on Real Estate [Abstract]      
Performing $ 2,593,276 $ 2,597,440  
In workout 6,248 26,723  
Delinquent 0 0  
Collateral dependent 8,174 34,720  
Principal outstanding $ 2,607,698 $ 2,658,883 $ 2,856,011