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Real Estate (Real estate available and held for sale) (Details) (USD $)
 9 Months Ended
Sep. 30, 2013
property
Dec. 31, 2012
Real Estate Properties [Line Items]    
Real estate available and held for sale $ 410,080,000 $ 635,865,000
Land
    
Real Estate Properties [Line Items]    
Real estate available and held for sale 147,748,000 181,278,000
Number of properties transferred from held for sale to held for use 2  
Property transferred from HFS, aggregate, carrying value 49,700,000  
Number of real estate properties transferred to held-for-sale 2  
Property transferred to held-for-sale, aggregate, carrying value 19,800,000  
Residential Operating Properties
    
Real Estate Properties [Line Items]    
Real estate available and held for sale 252,900,000 374,100,000
Net Lease
    
Real Estate Properties [Line Items]    
Real estate available and held for sale 0 0
Property transferred to held-for-sale, aggregate, carrying value 18,500,000  
Gain (loss) on real estate held for sale $ 3,600,000