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Real estate (Details 8) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Real Estate Properties [Line Items]          
Real estate available and held for sale $ 524,092,000   $ 524,092,000   $ 635,865,000
Income from sales of residential property 34,319,000 13,266,000 58,016,000 19,999,000  
Residential Operating Properties
          
Real Estate Properties [Line Items]          
Real estate available and held for sale 298,800,000   298,800,000   374,100,000
Condominium Units
          
Real Estate Properties [Line Items]          
Number of condominium units sold 103 168 199 262  
Income from sales of residential property 30,900,000 13,300,000 54,600,000 20,000,000  
Land
          
Real Estate Properties [Line Items]          
Real estate available and held for sale 179,827,000   179,827,000   181,278,000
Net Lease Assets
          
Real Estate Properties [Line Items]          
Gain (loss) on sale of leased assets, net, operating leases, sale carve out     3,400,000 2,400,000  
Real estate available and held for sale $ 8,694,000   $ 8,694,000   $ 0