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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
Jun. 30, 2014
Dec. 31, 2013
Mortgage Loans on Real Estate [Abstract]    
Individually evaluated for impairment $ 42,963 $ 47,018
Collectively evaluated for impairment 2,527,987 2,560,680
Principal outstanding $ 2,570,950 $ 2,607,698