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Indebtedness (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended 1 Months Ended 1 Months Ended 1 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended
Dec. 31, 2011
Issuance
Y
Dec. 31, 2010
Dec. 31, 2011
Significant Other Observable Inputs (Level 2)
Jun. 30, 2011
Unsecured revolving credit facility
Lenders
Y
Dec. 31, 2011
Unsecured revolving credit facility
Jan. 31, 2012
Senior unsecured notes 8.625%
Dec. 31, 2011
Senior unsecured notes 8.625%
Dec. 31, 2010
Senior unsecured notes 8.625%
Jan. 31, 2011
Senior unsecured notes 4.30%
Dec. 31, 2011
Senior unsecured notes 4.30%
Dec. 31, 2011
Senior unsecured notes 6.75%
Apr. 30, 2010
Senior unsecured notes 6.75%
Dec. 31, 2011
Senior unsecured notes 6.75% maturing in 2021
Dec. 31, 2011
Mortgages
Property
Dec. 31, 2011
Capital leases
Property
Dec. 31, 2010
Capital leases
Dec. 31, 2011
Previous unsecured revolving credit facility
Jun. 30, 2011
Previous unsecured revolving credit facility
Jan. 31, 2011
Previous unsecured revolving credit facility
Apr. 30, 2010
Previous unsecured revolving credit facility
Dec. 31, 2011
Previous unsecured revolving credit facility
Dec. 31, 2010
Previous unsecured revolving credit facility
May 31, 2010
Senior unsecured notes 7.875%
Dec. 31, 2010
Senior unsecured notes 7.875%
Indebtedness                                                
Unsecured revolving credit facility, maximum borrowing capacity $ 1,500,000     $ 750,000 $ 750,000                         $ 550,000       $ 550,000    
Number of public issuances of unsecured senior notes 4                                              
Principal amount of unsecured senior notes 965,770 422,880         225,000     250,000 200,000   300,000                      
Redemption of senior notes           225,000                                 97,500  
Aggregate principal amount of mortgage debt                           847,404                    
Number of properties mortgaged                           79 2                  
Carrying value of mortgaged properties 4,091,330 3,222,840                       1,126,006 16,027 17,983                
Number of properties recorded under capital lease                             2                  
Capital leases                             14,211                  
Mortgage debt assumed 217,317 2,458 217,317                                          
Weighted average interest rate on mortgage debt assumed (as a percent) 5.94%                                              
Weighted average maturity period of mortgage debt assumed (in years) 5.3                                              
Number of institutional lenders       26                                        
Loss on early extinguishment of debt 427 2,433                               427         2,433  
Period for which the facility can be extended (in years)       1                                        
Interest rate, description       LIBOR                                        
Interest rate added to the base rate (as a percent)       1.60%                                        
Revolving credit facility, interest rate payable (as a percent)         1.90%                                      
Revolving credit facility, available amount         750,000                                      
Debt sold                 250,000   300,000 200,000 300,000                      
Interest rate (as a percent)             8.625% 8.625% 4.30% 4.30% 6.75% 6.75% 6.75%   7.70% 7.70%               7.875%
Net proceeds from sale of notes                 245,354   292,170 194,945                        
Repayments of borrowings under revolving credit facility                                 70,000   120,000 58,000        
Debt prepayment premium                                             1,280  
Write off of unamortized deferred financing fees and debt discount                                         $ 427   $ 1,153 $ 1,153