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Summary of Significant Accounting Policies (Notes Receivable) (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Properties
Dec. 31, 2011
Dec. 31, 2010
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Allowance for Doubtful Accounts Receivable $ 13,500,000 $ 12,100,000  
Tenant receivables and accrued rent receivables, gross 3,100,000 3,400,000  
Notes receivable 7,226,000 18,186,000  
Number of properties sold 2    
Gross deferred gain on sale of properties 12,900,000    
Investment Income, Interest 3,012,000 1,813,000 3,218,000
Purchase money mortgage loan repayments terms start in 2013, to be fully paid in 2015    
20 Year Amortization Period [Member] | Purchase money mortgage [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Notes receivable 7,200,000 7,200,000  
Interest rate 8.50% 8.50%  
Notes receivable amortization period, years 20 years 20 years  
Due 2015 [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Notes receivable   500,000  
Interest rate 10.00% 10.00%  
Proceeds from Collection of Notes Receivable 600,000    
Due 2016 [Member] | Purchase money mortgage [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Notes receivable   23,400,000  
Notes receivable amortization period, years 7 years 7 years  
Cash pay interest rate   6.00%  
Interest accrual rate   7.64%  
Proceeds from Collection of Notes Receivable 23,500,000    
Trenton Properties [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Notes receivable   23,400,000  
Number of properties sold   2  
Gross deferred gain on sale of properties 12,900,000 12,900,000  
Investment Income, Interest $ 1,000,000