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Significant Accounting Policies (Details 2) (USD $)
In Millions, unless otherwise specified
1 Months Ended 6 Months Ended
Apr. 30, 2012
Item
Dec. 31, 2011
property
Jun. 30, 2012
Item
Jun. 30, 2011
Dec. 09, 2011
Loans Held for Investment          
Aggregate carrying values of mortgages and mezzanine loans   $ 162.8 $ 86.4    
Number of mortgage loans repaid 1        
Repayment of mortgage loans 76.8        
Mortgage and mezzanine loans on real estate, number of loans     2    
Amortizable mortgage and mezzanine loans on real estate, number of loans     1    
Amortization period for payments of interest and principal on mortgage notes and mezzanine loans     30 years    
Interest rates on mortgage notes and mezzanine loans, minimum (as a percent)     5.90%    
Interest rates on mortgage notes and mezzanine loans, maximum (as a percent)     7.00%    
Weighted average interest rates on mortgage notes and mezzanine loans (as a percent)   7.00% 6.60%    
Interest income on loans held for investment     5.0 13.9  
Ownership interest (as a percent)         50.00%
Consideration paid for equity interest   88.8      
Equity interest, number of real estate developments acquired   2      
Interest rate (as a percent)   7.00% 6.60%    
Aggregate amount drawn on the loans   $ 50.7 $ 106.9