Financial Instruments and Fair Value Measurements - Financial Instruments Not Carried at Fair Value (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Carrying value
Fair value of financial assets and liabilities
Mortgages payable assumed in connection with acquisitions	$ 1,069,300	$ 1,114,100
Notes and bonds payable	12,856,600	12,257,300
Estimated fair value
Fair value of financial assets and liabilities
Mortgages payable assumed in connection with acquisitions	1,060,500	1,154,700
Notes and bonds payable	12,653,300	13,114,500
Mortgages payable
Fair value of financial assets and liabilities
Unamortized net premiums	25,000	28,700
Deferred financing costs	713	790
Notes and bonds payable
Fair value of financial assets and liabilities
Unamortized net premiums	272,700	295,500
Deferred financing costs	$ 60,600	$ 53,100