CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Cash flows from operating activities:
Net income	$ 514,582	$ 400,642
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation expense	405,289	401,088
Amortization of deferred financing costs and debt discount	6,352	5,337
Amortization of stock-based compensation	15,115	17,681
Equity in loss (income) of, and return on, unconsolidated investments and noncontrolling interests, net of eliminations	622	(1)
Casualty loss	2,407	0
Abandonment of development pursuits	4,253	738
Cash flow hedge losses reclassified to earnings	708	2,026
Gain on sale of real estate assets	(188,078)	(150,753)
Decrease in resident security deposits, prepaid expenses and other assets	(28,456)	(31,336)
Increase (decrease) in accrued expenses, other liabilities and accrued interest payable	9,785	(5,374)
Net cash provided by operating activities	742,579	640,048
Cash flows from investing activities:
Development/redevelopment of real estate assets including land acquisitions and deferred development costs	(453,139)	(414,107)
Acquisition of real estate assets	0	(165,117)
Capital expenditures - existing real estate assets	(73,746)	(64,356)
Capital expenditures - non-real estate assets	(8,106)	(5,665)
Increase (decrease) in payables for construction	16,159	(5,024)
Proceeds from sale of real estate and for-sale condominiums, net of selling costs	252,904	305,842
Note receivable lending	(27,108)	(6,055)
Note receivable payments	230	4,021
Distributions from unconsolidated entities	3,859	2,000
Unconsolidated investments	(8,930)	(8,047)
Net cash used in investing activities	(297,877)	(356,508)
Cash flows from financing activities:
Issuance of common stock, net	494,959	2,010
Repurchase of common stock, net	(1,911)	0
Dividends paid	(454,323)	(445,226)
Repayments of mortgage notes payable, including prepayment penalties	(7,401)	(6,427)
Repayment of unsecured notes	(250,000)	(100,000)
Payment of deferred financing costs	(662)	(421)
Redemption of noncontrolling interest and units for cash by minority partners	(1,355)	0
Payments to noncontrolling interest	0	(29)
Payments related to tax withholding for share-based compensation	(10,509)	(16,379)
Distributions to DownREIT partnership unitholders	(25)	(24)
Distributions to joint venture and profit-sharing partners	(202)	(181)
Preferred interest obligation redemption and dividends	(520)	(460)
Net cash used in financing activities	(231,949)	(567,137)
Net increase (decrease) in cash, cash equivalents and cash in escrow	212,753	(283,597)
Cash, cash equivalents and cash in escrow, beginning of period	734,245	543,788
Cash, cash equivalents and cash in escrow, end of period	946,998	260,191
Cash paid during the period for interest, net of amount capitalized	94,241	106,443
Supplemental Cash Flow Information [Abstract]
Cash and cash equivalents	769,622	152,522
Cash in escrow	177,376	107,669
Cash, cash equivalents and cash in escrow reported in the Condensed Consolidated Statements of Cash Flows	$ 946,998	$ 260,191