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Accounting Policies and Related Matters (Details) (USD $)
12 Months Ended
Dec. 31, 2011
Number
Dec. 31, 2010
Number
Dec. 31, 2009
Dec. 31, 2008
Accounting Policies and Related Matters (Textuals) [Abstract]        
Weighted-average amortization period in years 17.0 18.2    
Capitalized interest costs $ 13,164,000 $ 20,792,000 $ 41,170,000  
Allowance for loan losses 0 1,276,000 5,183,000 7,500,000
Amount of non-accrual loans receivable outstanding 6,244,000 9,691,000 67,126,000  
Building [Member]
       
Real Property Owned (Textuals) [Abstract]        
Estimated useful lives of buildings and improvements minimum 15      
Estimated useful lives of buildings and improvements maximum 40      
Building Improvements [Member]
       
Real Property Owned (Textuals) [Abstract]        
Estimated useful lives of buildings and improvements minimum 5      
Estimated useful lives of buildings and improvements maximum $ 15