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Fair Value of Assets and Liabilities - Financial Instruments (Details)
$ in Thousands
1 Months Ended 9 Months Ended
Jun. 30, 2023
USD ($)
Sep. 30, 2023
USD ($)
mortgage_note
Sep. 30, 2022
USD ($)
Dec. 31, 2022
USD ($)
property
Fair Value of Financial Instruments        
Senior notes   $ 2,193,577   $ 2,187,875
Mortgage notes payable   172,331   $ 49,917
Repayment of mortgage notes payable   $ 50,000 $ 25,400  
Number of mortgage notes | mortgage_note   6    
4.25% Senior Unsecured Notes Due 2024        
Fair Value of Financial Instruments        
Interest rate (as a percent)   4.25%    
4.50% Senior Unsecured Notes Due 2025        
Fair Value of Financial Instruments        
Interest rate (as a percent)   4.50%    
2.650% Senior Unsecured Notes Due 2026        
Fair Value of Financial Instruments        
Interest rate (as a percent)   2.65%    
2.400% Senior Unsecured Notes Due 2027        
Fair Value of Financial Instruments        
Interest rate (as a percent)   2.40%    
3.450% Senior Unsecured Notes Due 2031        
Fair Value of Financial Instruments        
Interest rate (as a percent)   3.45%    
6.375% Senior Unsecured Notes Due 2050        
Fair Value of Financial Instruments        
Interest rate (as a percent)   6.375%    
3.700% Mortgage Notes Payable        
Fair Value of Financial Instruments        
Number of properties (in properties) | property       1
Mortgages        
Fair Value of Financial Instruments        
Interest rate (as a percent)   7.792%    
Outstanding principal amount   $ 177,320    
Mortgages | 3.700% Mortgage Notes Payable        
Fair Value of Financial Instruments        
Interest rate (as a percent) 3.70%      
Repayment of mortgage notes payable $ 50,000      
Senior Notes And Mortgages        
Fair Value of Financial Instruments        
Unamortized debt premiums, discounts and issuance costs   23,412   $ 24,208
Carrying Value        
Fair Value of Financial Instruments        
Fair value of financial instruments   2,365,908   2,237,792
Carrying Value | 4.25% Senior Unsecured Notes Due 2024        
Fair Value of Financial Instruments        
Senior notes   348,574   346,863
Carrying Value | 4.50% Senior Unsecured Notes Due 2025        
Fair Value of Financial Instruments        
Senior notes   645,404   642,818
Carrying Value | 2.650% Senior Unsecured Notes Due 2026        
Fair Value of Financial Instruments        
Senior notes   298,308   297,839
Carrying Value | 2.400% Senior Unsecured Notes Due 2027        
Fair Value of Financial Instruments        
Senior notes   347,931   347,466
Carrying Value | 3.450% Senior Unsecured Notes Due 2031        
Fair Value of Financial Instruments        
Senior notes   396,504   396,178
Carrying Value | 6.375% Senior Unsecured Notes Due 2050        
Fair Value of Financial Instruments        
Senior notes   156,856   156,711
Carrying Value | Mortgages        
Fair Value of Financial Instruments        
Mortgage notes payable   172,331   49,917
Fair Value        
Fair Value of Financial Instruments        
Fair value of financial instruments   1,744,621   1,840,543
Fair Value | 4.25% Senior Unsecured Notes Due 2024        
Fair Value of Financial Instruments        
Senior notes   331,881   331,601
Fair Value | 4.50% Senior Unsecured Notes Due 2025        
Fair Value of Financial Instruments        
Senior notes   531,284   589,388
Fair Value | 2.650% Senior Unsecured Notes Due 2026        
Fair Value of Financial Instruments        
Senior notes   204,081   232,770
Fair Value | 2.400% Senior Unsecured Notes Due 2027        
Fair Value of Financial Instruments        
Senior notes   209,255   256,606
Fair Value | 3.450% Senior Unsecured Notes Due 2031        
Fair Value of Financial Instruments        
Senior notes   202,504   268,004
Fair Value | 6.375% Senior Unsecured Notes Due 2050        
Fair Value of Financial Instruments        
Senior notes   89,748   113,075
Fair Value | Mortgages        
Fair Value of Financial Instruments        
Mortgage notes payable   $ 175,868   $ 49,099