Segment Reporting (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Reconciliation of NOI to net income
Net income	$ 78,847	$ 147,717	$ 669,058	$ 486,592
Property management and other indirect operating expenses, net of corporate income	25,322	23,837	74,110	70,043
Other Nonoperating Income (Expense)	417	567	1,900	4,289
Interest Expense	55,987	53,249	164,704	162,562
Loss on extinguishment of debt, net	(17,890)	105	(17,768)	(9,333)
General and administrative expense	17,313	13,985	53,130	46,878
Income from investments in unconsolidated entities	(6,867)	(5,083)	(32,959)	(6,770)
Depreciation expense	193,791	175,348	561,560	529,508
Income tax expense (benefit)	2,179	(27)	1,434	(1,069)
Casualty and impairment loss	1,940	0	3,117	0
Gain on sale of communities	(58)	(31,607)	(388,354)	(91,338)
Gain on other real estate transactions, net	(1,543)	(129)	(2,002)	(328)
Net for-sale condominium activity	(158)	646	1,402	(4,162)
Net operating income from real estate assets sold or held for sale	(2,373)	(14,686)	(17,393)	(47,798)
Net operating income	$ 382,687	$ 363,712	$ 1,107,475	$ 1,157,740
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	1.80%	1.20%	1.60%	1.10%