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Notes Payable (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
 1 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended
Oct. 31, 2012
Sep. 30, 2012
Y
Sep. 30, 2012
Letter Of Credit [Member]
Sep. 30, 2012
Floating Rate Debt [Member]
Sep. 30, 2011
Floating Rate Debt [Member]
Sep. 30, 2012
Line of Credit [Member]
Jun. 30, 2012
0.96% - 6.00% Conventional Mortgage Notes, Due 2013 - 2045 [Member]
Jun. 30, 2012
0.96% - 6.00% Conventional Mortgage Notes, Due 2013 - 2045 [Member]
Secured Debt [Member]
Sep. 30, 2012
Secured Notes Five Point Zero Seven Percentage Conventional Mortgage Note Due Two Thousand Twelve [Member]
Sep. 30, 2012
Secured Notes Five Point Zero Seven Percentage Conventional Mortgage Note Due Two Thousand Twelve [Member]
Secured Debt [Member]
Sep. 30, 2012
Secured Notes Four Point Nine Two Percentage Conventional Mortgage Note Due Two Thousand Twelve [Member]
Sep. 30, 2012
Secured Notes Four Point Nine Two Percentage Conventional Mortgage Note Due Two Thousand Twelve [Member]
Secured Debt [Member]
Amount of current borrowing capacity under unsecured credit facility           $ 500            
Unsecured Credit Facility, Expiration Date           Sep. 22, 2015            
Optional extension period of unsecured credit facility           September 2016            
Maximum borrowing capacity under unsecured credit facility     100     750            
Maximum term of bid rate loans (days)           180            
Lesser of amount stated or the amount available under the line of credit           250            
Outstanding letters of credit under credit facility     10.9                  
Available amount under unsecured credit facility           455.1            
Notes payable, effective interest rate               4.92%   5.07%   4.92%
Repayments of secured third-party notes payable $ 31.5           $ 33.7   $ 19.3   $ 16.7  
Extended Maturity Period Of Secured Third Party Note Payable   August 2013                    
Weighted average interest rate on floating rate debt   4.80%   1.10% 1.10%              
Weighted average maturity of indebtedness (including unsecured line of credit) (in years)   6.2