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Fair Value Disclosures (Details 4) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Mortgage Loans [Member]
    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fair Value Assets Carrying Value Prior To Impairment $ 24,295,000 $ 27,227,000
Fair Value Assets Estimate Of Fair Value 20,480,000 21,220,000
Fair Value Assets Gains Losses (3,815,000) (6,007,000)
Limited Partnership Interest [Member]
    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fair Value Assets Carrying Value Prior To Impairment 25,191,000 0
Fair Value Assets Estimate Of Fair Value 16,944,000 0
Fair Value Assets Gains Losses (8,247,000) 0
Real Estate Investments [Member]
    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fair Value Assets Carrying Value Prior To Impairment 6,593,000 0
Fair Value Assets Estimate Of Fair Value 4,500,000 0
Fair Value Assets Gains Losses $ (2,093,000) $ 0