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Mortgage Loans Payable and Secured Revolving Credit Facilities (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2010
Line of Credit Facility [Line Items]    
Lender fees, closing and transaction costs $ 4,000,000  
Write-off of unamortized fees 2,607,000 2,552,000
Basis spread on borrowings variable rate 250.00%  
Weighted-average interest rate 2.80%  
Additional borrowing capacity under accordion feature 500,000,000  
Revolving credit facility, amount outstanding 81,000,000  
Remaining borrowing capacity 81,800,000  
Revolving Credit Facility [Member]
    
Line of Credit Facility [Line Items]    
Credit facility borrowing capacity 225,000,000  
Term Loan [Member]
    
Line of Credit Facility [Line Items]    
Credit facility borrowing capacity 75,000,000  
Minimum [Member]
    
Line of Credit Facility [Line Items]    
Basis spread on borrowings variable rate 200.00%  
Maximum [Member]
    
Line of Credit Facility [Line Items]    
Basis spread on borrowings variable rate 300.00%  
New [Member]
    
Line of Credit Facility [Line Items]    
Credit facility borrowing capacity 300,000,000  
Prior [Member] | Revolving Credit Facility [Member]
    
Line of Credit Facility [Line Items]    
Credit facility borrowing capacity 185,000,000  
Prior [Member] | Development Porperty Credit Facility [Member]
    
Line of Credit Facility [Line Items]    
Credit facility borrowing capacity $ 150,000,000