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Indebtedness (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended 0 Months Ended 12 Months Ended 12 Months Ended 1 Months Ended 1 Months Ended 12 Months Ended
Dec. 31, 2013
item
Dec. 31, 2012
Dec. 31, 2011
Aug. 31, 2013
Unsecured revolving credit facility
Dec. 31, 2013
Unsecured revolving credit facility
Feb. 28, 2014
Unsecured revolving credit facility
Dec. 31, 2012
Unsecured revolving credit facility
Dec. 31, 2013
Senior unsecured notes 4.30%
Dec. 31, 2012
Senior unsecured notes 4.30%
Dec. 31, 2011
Senior unsecured notes 6.75%
Dec. 31, 2013
Senior unsecured notes 6.75%
Dec. 31, 2012
Senior unsecured notes 6.75%
Dec. 31, 2013
Senior unsecured notes 6.75% maturing in 2021
Dec. 31, 2012
Senior unsecured notes 6.75% maturing in 2021
Jul. 31, 2012
Senior unsecured notes 5.625% due in 2042
Dec. 31, 2013
Senior unsecured notes 5.625% due in 2042
Dec. 31, 2012
Senior unsecured notes 5.625% due in 2042
Sep. 30, 2013
Mortgages
item
Jun. 30, 2013
Mortgages
item
Aug. 31, 2012
Mortgages
item
Dec. 31, 2013
Mortgages
item
Dec. 31, 2013
Mortgages
Significant Unobservable Inputs (Level 3)
Dec. 31, 2013
Capital leases
item
property
Dec. 31, 2012
Capital leases
Indebtedness                                                
Unsecured revolving credit facility, maximum borrowing capacity $ 750,000       $ 750,000                                      
Number of public issues of unsecured senior notes 4                                              
Principal amount of unsecured senior notes 1,093,337 1,092,053           250,000     200,000   300,000     350,000                
Aggregate principal amount of mortgage debt                                         681,628      
Interest rate (as a percent)               4.30% 4.30%   6.75% 6.75% 6.75% 6.75% 5.625% 5.625% 5.625%     6.40% 6.25%   7.70% 7.70%
Number of properties mortgaged                                       28 51   2  
Carrying value of mortgaged properties 4,422,865 4,304,928                                     945,419   18,626 15,603
Mortgage debt assumed in connection with real estate acquisitions 12,266 121,793 217,317                                     12,266    
Fair value of mortgage notes payable                                           13,306    
Increase (decrease) in outstanding principal balances                                           1,040    
Number of properties recorded under capital lease                                             2  
Capital leases                                             13,314  
Number of mortgage notes                                   2 4          
Prepayment of mortgage notes                                   13,579 10,377          
Extension period of revolving credit facility         1 year                                      
Option to increase the borrowing capacity under revolving credit facility         1,500,000                                      
Interest rate, description       LIBOR LIBOR                                      
Interest rate added to the base rate (as a percent)       1.60% 1.30%                                      
Debt instrument, facility fee (as a percent)       0.35% 0.30%                                      
Revolving credit facility, interest rate payable (as a percent) 1.40%                                              
Weighted average interest rate on debt (as a percent) 6.25% 5.84%     1.60%   1.80%                     6.90% 6.10%          
Losses on early extinguishment of debt 797 6,349 427   538                             6,349 259      
Sale of senior unsecured notes                   300,000         350,000                  
Net proceeds from sale of senior unsecured notes                             338,561                  
Principal repayment due until maturity 0                                              
Early repayment of debt variable portion                                       199,197        
Number of Properties released from mortgage as collateral                                       11        
Interest expense and other associated costs incurred 3,781 5,733 2,745                                          
Unsecured revolving credit facility, amount outstanding         $ 100,000 $ 170,000