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Mortgage Loans on Real Estate (Mortgage Loans by Credit Quality Indicator) (Details) (Financing Receivable, by Credit Quality Indicator, Credit Exposure by Payment Activity [Member], USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Financing Receivable, by Credit Quality Indicator, Credit Exposure by Payment Activity [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Performing $ 2,588,791 $ 2,597,440
In workout 30,724 26,723
Collateral dependent 6,048 34,720
Principal outstanding $ 2,625,563 $ 2,658,883