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Indebtedness - Debt Obligations (Details)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2020
USD ($)
building
extension_option
Aug. 31, 2020
USD ($)
property
Jun. 30, 2020
USD ($)
Apr. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
property
Jan. 31, 2020
USD ($)
Sep. 30, 2020
USD ($)
building
extension_option
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
building
extension_option
Sep. 30, 2019
USD ($)
Oct. 29, 2020
USD ($)
Jul. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Debt Instrument [Line Items]                          
Borrowings outstanding $ 0           $ 0   $ 0       $ 0
Aggregate principal amount on secured properties $ 171,475           171,475   171,475        
Loss on early extinguishment of debt             $ 0 $ (284) $ (3,839) $ (769)      
Number of properties sold | property         1                
Number of collateral properties | property   1                      
Number of buildings secured by mortgage notes | building 7           7   7        
Aggregate net book value of secured properties $ 307,837           $ 307,837   $ 307,837        
Senior unsecured notes, 3.60% interest rate, due in 2020                          
Debt Instrument [Line Items]                          
Interest rate (as a percent) 3.60%           3.60%   3.60%        
Senior unsecured notes, 6.375% interest rate, due in 2050                          
Debt Instrument [Line Items]                          
Interest rate (as a percent) 6.375%           6.375%   6.375%        
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 | extension_option 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%       2.70%
The weighted average annual interest rate (as a percent)             1.20% 3.30% 2.00% 3.40%      
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 $ 2,072,000           $ 2,072,000   $ 2,072,000        
LIBOR | Unsecured revolving credit facility                          
Debt Instrument [Line Items]                          
Interest rate premium (as a percent)                 1.10%        
Senior unsecured notes | Senior unsecured notes, 3.60% interest rate, due in 2020                          
Debt Instrument [Line Items]                          
Interest rate (as a percent)           3.60%              
Repayments of debt           $ 400,000              
Loss on early extinguishment of debt                 $ 61        
Senior unsecured notes | Senior unsecured notes, 6.375% interest rate, due in 2050                          
Debt Instrument [Line Items]                          
Interest rate (as a percent)     6.375%                    
Principal balance     $ 150,000                    
Debt instrument, option to purchase period     30 days                    
Principal balance of additional option     $ 22,500                 $ 12,000  
Proceeds from issuance of long-term debt     156,186                    
Senior unsecured notes | Senior unsecured notes, 4.50% interest rate, due in 2025                          
Debt Instrument [Line Items]                          
Interest rate (as a percent) 4.50%           4.50%   4.50%        
Principal balance $ 250,000           $ 250,000   $ 250,000        
Senior unsecured notes | Senior Unsecured Notes Due In 2025 [Member]                          
Debt Instrument [Line Items]                          
Principal balance $ 400,000           400,000   400,000        
Proceeds from issuance of long-term debt     $ 251,269                    
Debt instrument, offering price, percentage of principal amount 101.414%                        
Mortgages                          
Debt Instrument [Line Items]                          
Outstanding principal amount $ 171,475           $ 171,475   $ 171,475        
Mortgages | Mortgage notes payable, 5.9% interest rate, due in 2021                          
Debt Instrument [Line Items]                          
Interest rate (as a percent) 5.90%       5.90%   5.90%   5.90%        
Repayments of debt         $ 13,095                
Loss on early extinguishment of debt                 $ 508        
Mortgages | Mortgage notes payable, 4.0% interest rate, due in 2030                          
Debt Instrument [Line Items]                          
Interest rate (as a percent)         4.00%                
Repayments of debt         $ 66,780                
Loss on early extinguishment of debt                 2,713        
Mortgages | Mortgage notes payable, 5.7% interest rate, due in 2020                          
Debt Instrument [Line Items]                          
Interest rate (as a percent)       5.70%                  
Repayments of debt       $ 32,677                  
Loss on early extinguishment of debt                 $ 163        
Mortgages | Mortgage notes payable, 2.2% interest rate, due in 2020                          
Debt Instrument [Line Items]                          
Interest rate (as a percent)   2.20%                      
Repayments of debt   $ 39,635