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Indebtedness (Narrative) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Mar. 31, 2012
Term Loans Fully Drawn [Member]
Mar. 31, 2012
Unsecured Revolving Lines Of Credit [Member]
Mar. 31, 2012
Syndicated Line Of Credit [Member]
Mar. 31, 2012
Cash Management Line [Member]
Mar. 31, 2012
Unsecured Bank Term Loan [Member]
Jan. 31, 2012
Unsecured Bank Term Loan [Member]
Debt Instrument [Line Items]                
Term loan facility, borrowing capacity               $ 300,000
Term loan facility, current borrowing amount             100,000  
Term loan facility, additional borrowing capacity             200,000  
Interest Rate, spread over LIBOR       1.40% [1] 1.40%   1.90% [2]  
Unused commitment fees             0.25%  
Interest rate based on credit ratings ranges, minimum         1.00%   1.50%  
Interest rate based on credit ratings ranges, maximum         1.80%   2.30%  
Maturity date             Jan. 01, 2018  
LIBOR component of the interest rate             1.54%  
Effective blended fixed rate     3.44%          
Line of credit facility, annual facility fees percentage         0.30%      
Previous interest rate, spread over LIBOR         2.30%      
Previous line of credit facility annual facility fees percentage         0.45%      
Line of credit facility, expiration year         January 2016 January 2016    
Line of credit facility, competitive bid option for short-term funds, percentage         50.00%      
Letters of credit issued 650              
Line of credit facility, current borrowing capacity         300,000 30,000    
Line of credit facility, covenant terms

The Company's Syndicated Line, Cash Management Line, Term Loan and senior unsecured notes contain customary restrictions, representations, covenants and events of default and require the Company to meet certain financial covenants. Debt service and fixed charge coverage covenants require the Company to maintain coverages of a minimum of 1.5 to 1.0, as defined in applicable debt arrangements. Additionally, the Company's ratio of unencumbered adjusted property-level net operating income to unsecured interest expense may not be less than 2.0 to 1.0, as defined in the applicable debt arrangements. Leverage covenants generally require the Company to maintain calculated covenants above/below minimum/maximum thresholds. The primary leverage ratios under these arrangements include total debt to total asset value (maximum of 60%), total secured debt to total asset value (maximum of 40%) and unencumbered assets to unsecured debt (minimum of 1.5 to 1.0), as defined in the applicable debt arrangements. The Company believes it met these financial covenants at March 31, 2012.

              
Facility fee rate based on credit ratings range, minimum         0.15%      
Facility fee rate based on credit ratings range, maximum         0.40%      
Fees and expenses incurred (301)              
Unamortized deferred financing costs $ 5,083 $ 3,972            
Coverages ratio 1.5              
Company's ratio 2.0              
Leverage ratio 60.00%              
Total secured debt to total asset value 40.00%              
Unencumbered assets to unsecured debt 1.5              
Number of six-month extension options             2  
Number of extension options           1    
[1] Represents stated rate. At March 31, 2012, the weighted average interest rate was 1.64%.
[2] Represents stated rate. As discussed below, the Company has entered into interest rate swap arrangements that effectively fix the interest rate under this facility at 3.45% as of March 31, 2012.