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Mortgage Loans on Real Estate (Mortgage Loans by Credit Quality Indicator) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Mortgage Loans on Real Estate [Abstract]    
Performing $ 2,591,196 $ 2,593,276
In workout 7,956 6,248
Delinquent 0 0
Collateral dependent 11,228 8,174
Principal outstanding $ 2,610,380 $ 2,607,698