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Indebtedness (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 1 Months Ended 3 Months Ended 1 Months Ended 0 Months Ended
Jun. 30, 2014
item
Jun. 30, 2014
item
Jun. 30, 2013
Dec. 31, 2013
Jun. 30, 2014
Unsecured revolving credit facility
Jun. 30, 2013
Unsecured revolving credit facility
Jun. 30, 2014
Unsecured revolving credit facility
Jun. 30, 2013
Unsecured revolving credit facility
Aug. 04, 2014
Unsecured revolving credit facility
Subsequent event
Jun. 30, 2014
Senior unsecured notes 4.30%
Jun. 30, 2014
Senior unsecured notes 6.75%
Jun. 30, 2014
Senior unsecured notes 6.75% maturing in 2021
Jun. 30, 2014
Senior unsecured notes 5.625% due in 2042
Jun. 30, 2014
Mortgages
item
property
building
Jun. 30, 2014
Mortgages
Significant Unobservable Inputs (Level 3)
Jun. 30, 2014
Capital leases
property
Apr. 30, 2014
Senior unsecured notes due 2019
Apr. 30, 2014
Senior unsecured notes due 2024
May 30, 2014
Unsecured term loan
Jun. 30, 2014
Unsecured term loan
Indebtedness                                        
Number of public issues of unsecured senior notes 6 6                                    
Principal amount of unsecured senior notes $ 1,742,893 $ 1,742,893   $ 1,093,337           $ 250,000 $ 200,000 $ 300,000 $ 350,000       $ 400,000 $ 250,000    
Unsecured term loan facility                                       350,000
Aggregate principal amount of mortgage debt                           655,324            
Interest rate (as a percent) 1.55% 1.55%               4.30% 6.75% 6.75% 5.625%   6.28%   3.25% 4.75%    
Number of buildings mortgaged                           50            
Number of properties mortgaged                           47            
Number of properties recorded under capital lease                               2        
Carrying value of mortgaged properties 5,258,671 5,258,671   4,422,865                   886,458   18,403        
Capital leases                               13,047        
Extension period of revolving credit facility             1 year                          
Principal repayment due until maturity             0                          
Option to increase the borrowing capacity under revolving credit facility         1,500,000   1,500,000                          
Maximum borrowing capacity that may be increased                                     700,000  
Interest rate, description             LIBOR                       LIBOR  
Interest rate added to the base rate (as a percent)             1.30%                       1.40%  
Debt instrument, facility fee (as a percent)             0.30%                          
Weighted average interest rate on debt (as a percent)         1.42% 2.56% 1.42% 1.86%                        
Debt, Weighted Average Interest Rate                           5.80%           1.55%
Interest expense and other associated costs incurred         969   1,880                          
Unsecured revolving credit facility, amount outstanding         0   0   0                      
Revolving credit facility, available amount         750,000   750,000   750,000                      
Sale of senior unsecured notes   350,000                             400,000 250,000    
Net proceeds after underwriting discounts from sale of senior unsecured notes 644,889                                 644,889    
Assumption of mortgage notes payable   15,630 12,266                       15,630          
Fair value of mortgage notes payable                             16,643          
Increase (decrease) in outstanding principal balances                             1,013          
Number of mortgage notes                           2            
Prepayment of mortgage notes                           $ 35,300