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Financial Instruments and Fair Value Measurements - Financial Instruments Not Carried at Fair Value (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Carrying value    
Fair value of financial assets and liabilities    
Mortgages payable assumed in connection with acquisitions $ 1,114,100 $ 299,600
Notes and bonds payable 12,257,300 8,302,400
Estimated fair value    
Fair value of financial assets and liabilities    
Mortgages payable assumed in connection with acquisitions 1,154,700 309,400
Notes and bonds payable 13,114,500 9,324,000
Mortgages payable    
Fair value of financial assets and liabilities    
Unamortized net premiums 28,700 1,700
Deferred financing costs 790 973
Notes and bonds payable    
Fair value of financial assets and liabilities    
Unamortized net premiums 295,500 14,600
Deferred financing costs $ 53,100 $ 49,200