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Commitments and Contingencies (Details) (USD $)
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Loss Contingencies [Line Items]      
Commitment to Provide Funding to Tenants for Capital Improvements $ 143,800,000    
Letter of Credit Renewal Period 1 year    
Property Subject to or Available for Operating Lease, Number of Units 3    
Operating Leases, Future Minimum Payments Due [Abstract]      
2012 750,000    
2013 750,000    
2014 750,000    
2015 749,000    
2016 749,000    
Thereafter 74,870,000    
Total 78,618,000    
Collectibility of Tenant Reimbursements [Member]
     
Loss Contingencies [Line Items]      
Loss Contingency, Loss in Period 700,000 400,000 1,400,000
Pending or Threatened Litigation [Member]
     
Operating Leases, Future Minimum Payments Due [Abstract]      
Number of Lawsuits as Defendant 2    
Loss Contingency, Damages Sought, Value 159,000,000    
Loss Contingency, Range of Possible Loss, Minimum 0    
Loss Contingency, Range of Possible Loss, Maximum 159,000,000    
Letter Of Credit August 2012 [Member]
     
Loss Contingencies [Line Items]      
Letters of Credit Outstanding, Amount 382,556    
Letter of Credit Renewal Period 1 year    
Letter of Credit 2, February 2012 [Member]
     
Loss Contingencies [Line Items]      
Letters of Credit Outstanding, Amount 14,782,820    
Letter of Credit Renewal Period 1 year    
Letter of Credit, December 2012 [Member]
     
Loss Contingencies [Line Items]      
Letters of Credit Outstanding, Amount 1,231,573    
Letter of Credit Renewal Period 1 year    
Letter Of Credit, June 2012 [Member]
     
Loss Contingencies [Line Items]      
Letters of Credit Outstanding, Amount 9,033,164    
Letter of Credit Renewal Period 1 year    
Unsecured Debt [Member] | $500 Million Unsecured Facility [Member]
     
Loss Contingencies [Line Items]      
Debt Instrument, Face Amount 500,000,000    
Land [Member]
     
Operating Leases, Future Minimum Payments Due [Abstract]      
Operating Leases, Rent Expense 600,000 600,000 600,000
Building [Member]
     
Operating Leases, Future Minimum Payments Due [Abstract]      
Property Subject to or Available for Operating Lease, Net 26,000,000 26,400,000  
Maximum [Member] | Pending or Threatened Litigation [Member]
     
Operating Leases, Future Minimum Payments Due [Abstract]      
Estimated Insurance Recoveries $ 15,000,000