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Mortgage Loans on Real Estate (Impaired Mortgage Loans on Real Estate By Basis of Impairment) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Mortgage Loans on Real Estate [Abstract]      
Individually evaluated for impairment $ 47,018 $ 53,110 $ 67,698
Collectively evaluated for impairment 2,560,680 2,605,773 2,788,313
Principal outstanding $ 2,607,698 $ 2,658,883 $ 2,856,011