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Mortgage Loans on Real Estate (Mortgage Loans by Credit Quality Indicator) (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Mortgage Loans on Real Estate [Abstract]    
Performing $ 2,559,419 $ 2,593,276
In workout 2,213 6,248
Delinquent 0 0
Collateral dependent 9,318 8,174
Principal outstanding $ 2,570,950 $ 2,607,698