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