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Real estate (Details 8) (USD $)
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Real Estate Properties [Line Items]      
Real estate available and held for sale $ 599,061,000 $ 635,865,000 $ 635,865,000
Proceeds from sale of other real estate 75,200,000 49,500,000  
Income from sales of residential property 23,697,000 6,733,000  
Residential Operating Properties
     
Real Estate Properties [Line Items]      
Real estate available and held for sale 353,200,000   374,100,000
Land
     
Real Estate Properties [Line Items]      
Real estate available and held for sale 179,716,000   181,278,000
Commercial Operating Properties
     
Real Estate Properties [Line Items]      
Real estate available and held for sale 56,400,000   80,500,000
Net Lease Assets
     
Real Estate Properties [Line Items]      
Real estate available and held for sale $ 9,766,000   $ 0