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Mortgage Loans on Real Estate (Mortgage Loans by Credit Quality Indicator) (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Mortgage Loans on Real Estate [Abstract]    
Performing $ 2,443,679 $ 2,451,760
In workout 10,739 0
Delinquent 0 0
Collateral dependent 16,038 5,961
Principal outstanding $ 2,470,456 $ 2,457,721