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Financial Instruments and Fair Value Measurements - Summary of Fair Value (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Carrying value    
Fair value of financial assets and liabilities    
Mortgages payable assumed in connection with acquisitions $ 299,600 $ 408,400
Notes and bonds payable 8,302,400 6,317,600
Estimated fair value    
Fair value of financial assets and liabilities    
Mortgages payable assumed in connection with acquisitions 309,400 417,700
Notes and bonds payable 9,324,000 6,826,100
Mortgages payable    
Fair value of financial assets and liabilities    
Unamortized net original issuance premiums 1,700 3,000
Deferred financing costs 973 1,300
Notes and bonds payable    
Fair value of financial assets and liabilities    
Unamortized net original issuance premiums 14,600 6,300
Deferred financing costs $ 49,200 $ 35,900