Segment Reporting (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Reconciliation of NOI to net income
Net income	$ 142,234	$ 168,006
Indirect operating expenses, net of corporate income	24,470	22,799
Other Nonoperating Income (Expense)	(170)	3,334
Interest Expense	52,613	55,914
Gain (Loss) on Extinguishment of Debt	122	(9,170)
General and administrative expense	17,352	17,320
Equity in loss (income) of unconsolidated real estate entities	467	(1,175)
Depreciation expense	183,297	177,911
Income tax (benefit) expense	(755)	91
Gain on sale of communities	(53,727)	(24,436)
Gain on other real estate transactions, net	(427)	(43)
Net for-sale condominium activity	913	(3,460)
Net operating income from real estate assets sold or held for sale	(1,490)	(9,918)
Net operating income	$ 364,655	$ 415,513
Non-Apartment Components Of Mixed-Use Communities And Other Nonresidential Operations | Operating Income (Loss) | Product Concentration Risk
Segment Reporting Information [Line Items]
Concentration Risk, Percentage	1.50%	1.60%