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Indebtedness - Debt Obligations (Details)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2021
USD ($)
extensionOption
building
Aug. 31, 2021
USD ($)
Jun. 30, 2021
USD ($)
May 31, 2021
USD ($)
Sep. 30, 2021
USD ($)
extensionOption
building
Mar. 31, 2021
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
extensionOption
building
Sep. 30, 2020
USD ($)
Oct. 27, 2021
USD ($)
Dec. 31, 2020
USD ($)
Debt Instrument [Line Items]                      
Borrowings outstanding $ 0       $ 0     $ 0     $ 0
Aggregate principal amount on secured properties $ 98,604       98,604     98,604      
Loss on early extinguishment of debt         $ 2,274   $ 0 $ 14,068 $ 3,839    
Number of buildings secured by mortgage notes | building 3       3     3      
Aggregate net book value of secured properties $ 189,298       $ 189,298     $ 189,298      
2.650% Senior Unsecured Notes Due 2026                      
Debt Instrument [Line Items]                      
Interest rate (as a percent) 2.65%       2.65%     2.65%      
2.400% Senior Unsecured Notes Due 2027                      
Debt Instrument [Line Items]                      
Interest rate (as a percent) 2.40%       2.40%     2.40%      
3.450% Senior Unsecured Notes Due 2031                      
Debt Instrument [Line Items]                      
Interest rate (as a percent) 3.45%       3.45%     3.45%      
5.875% Senior Unsecured Notes Due 2046                      
Debt Instrument [Line Items]                      
Interest rate (as a percent) 5.875%       5.875%     5.875%      
4.15% Senior Unsecured Notes Due 2022                      
Debt Instrument [Line Items]                      
Interest rate (as a percent) 4.15%       4.15%     4.15%      
Unsecured revolving credit facility                      
Debt Instrument [Line Items]                      
Borrowings outstanding $ 0       $ 0     $ 0      
Maximum borrowing capacity on revolving credit facility 750,000       750,000     750,000      
Aggregate principal amount on secured properties $ 1,950,000       $ 1,950,000     $ 1,950,000      
Number of extension options | extensionOption 2       2     2      
Extension option duration               6 months      
Facility fee (as a percent)               0.25%      
Interest rate (as a percent) 1.20%       1.20%     1.20%     1.20%
The weighted average annual interest rate (as a percent)         1.20%   1.20% 1.20% 2.00%    
Line of credit facility, remaining borrowing capacity $ 750,000       $ 750,000     $ 750,000      
Unsecured revolving credit facility | Subsequent Event                      
Debt Instrument [Line Items]                      
Borrowings outstanding                   $ 0  
Line of credit facility, remaining borrowing capacity                   $ 750,000  
Senior unsecured notes                      
Debt Instrument [Line Items]                      
Borrowings outstanding $ 2,512,000       $ 2,512,000     $ 2,512,000      
LIBOR | Unsecured revolving credit facility                      
Debt Instrument [Line Items]                      
Interest rate premium (as a percent)               1.10%      
Senior unsecured notes | 2.650% Senior Unsecured Notes Due 2026                      
Debt Instrument [Line Items]                      
Interest rate (as a percent)       2.65%              
Principal balance       $ 300,000              
Proceeds from issuance of long-term debt       $ 296,826              
Senior unsecured notes | 2.400% Senior Unsecured Notes Due 2027                      
Debt Instrument [Line Items]                      
Interest rate (as a percent)   2.40%                  
Principal balance   $ 350,000                  
Proceeds from issuance of long-term debt   $ 346,630                  
Senior unsecured notes | 3.450% Senior Unsecured Notes Due 2031                      
Debt Instrument [Line Items]                      
Interest rate (as a percent) 3.45%       3.45%     3.45%      
Principal balance $ 400,000       $ 400,000     $ 400,000      
Proceeds from issuance of long-term debt $ 395,698                    
Senior unsecured notes | 5.875% Senior Unsecured Notes Due 2046                      
Debt Instrument [Line Items]                      
Interest rate (as a percent)     5.875%                
Debt instrument, repurchased face amount     $ 310,000                
Loss on early extinguishment of debt               $ 8,581      
Senior unsecured notes | 4.15% Senior Unsecured Notes Due 2022                      
Debt Instrument [Line Items]                      
Interest rate (as a percent) 4.15%       4.15%     4.15%      
Debt instrument, repurchased face amount $ 300,000       $ 300,000     $ 300,000      
Loss on early extinguishment of debt               2,274      
Mortgages                      
Debt Instrument [Line Items]                      
Outstanding principal amount $ 98,604       $ 98,604     98,604      
Repayments of debt           $ 71,000          
Mortgages | 3.55% Mortgage Notes Payable due May 2023                      
Debt Instrument [Line Items]                      
Interest rate (as a percent)     3.55%                
Loss on early extinguishment of debt               $ 3,213      
Repayments of debt     $ 71,000