Consolidated Statement Of Shareholders' Equity - USD ($) $ in Thousands	Total	downREIT OP units	Preferred Shares	Common Shares	Common Shares downREIT OP units	Additional Paid-in Capital	Additional Paid-in Capital downREIT OP units	Accumulated Dividends in Excess of Net Income	Accumulated Other Comprehensive Income (Loss)	Noncontrolling Interest	Noncontrolling Interest downREIT OP units
Beginning balance (in shares) at Dec. 31, 2022			398,878	81,342,959
Beginning balance at Dec. 31, 2022	$ 3,034,015		$ 159,822	$ 818		$ 3,821,801		$ (1,034,186)	$ 5,757	$ 80,003
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income, excluding amounts attributable to redeemable noncontrolling interests	175,091							172,882		2,209
Other comprehensive income (loss) - change in fair value of interest rate swaps, excluding portion attributable to redeemable noncontrolling interests	1,016								1,016
Dividends declared to common shareholders	(265,022)							(265,022)
Dividends declared to preferred shareholders	(6,024)							(6,024)
Distributions declared to noncontrolling interests, excluding amounts attributable to redeemable noncontrolling interests	(3,283)									(3,283)
Common shares issued, net (in shares)				152,141
Common shares issued, net	15,895			$ 2		15,893
Shares issued under dividend reinvestment plan (in shares)				14,398
Shares issued under dividend reinvestment plan	1,380					1,380
Share-based compensation expense, net of forfeitures (in shares)				145,156
Share-based compensation expense, net of forfeitures	11,868			$ 1		11,867
Shares withheld for employee taxes (in shares)				(45,615)
Shares withheld for employee taxes	(4,979)					(4,979)
Conversion and redemption of downREIT OP units (in Shares)					9,123
Conversion and redemption of downREIT OP units					$ 0		$ 883
Purchase of noncontrolling interest		$ 0									$ (883)
Contributions from noncontrolling interests	1,092									1,092
Ending balance (in shares) at Sep. 30, 2023			398,878	81,618,162
Ending balance at Sep. 30, 2023	2,961,049		$ 159,822	$ 821		3,846,845		(1,132,350)	6,773	79,138
Beginning balance (in shares) at Jun. 30, 2023			398,878	81,515,511
Beginning balance at Jun. 30, 2023	2,980,431		$ 159,822	$ 820		3,832,983		(1,098,432)	5,496	79,742
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income, excluding amounts attributable to redeemable noncontrolling interests	57,575							57,048		527
Other comprehensive income (loss) - change in fair value of interest rate swaps, excluding portion attributable to redeemable noncontrolling interests	1,277								1,277
Dividends declared to common shareholders	(88,958)							(88,958)
Dividends declared to preferred shareholders	(2,008)							(2,008)
Distributions declared to noncontrolling interests, excluding amounts attributable to redeemable noncontrolling interests	(1,081)									(1,081)
Common shares issued, net (in shares)				95,045
Common shares issued, net	9,703			$ 1		9,702
Shares issued under dividend reinvestment plan (in shares)				4,767
Shares issued under dividend reinvestment plan	475					475
Share-based compensation expense, net of forfeitures (in shares)				3,922
Share-based compensation expense, net of forfeitures	3,738			$ 0		3,738
Shares withheld for employee taxes (in shares)				(2,683)
Shares withheld for employee taxes	(268)					(268)
Conversion and redemption of downREIT OP units (in Shares)					1,600
Conversion and redemption of downREIT OP units		0			$ 0		215
Purchase of noncontrolling interest											(215)
Contributions from noncontrolling interests	165									165
Ending balance (in shares) at Sep. 30, 2023			398,878	81,618,162
Ending balance at Sep. 30, 2023	2,961,049		$ 159,822	$ 821		3,846,845		(1,132,350)	6,773	79,138
Beginning balance (in shares) at Dec. 31, 2023			398,878	82,775,286
Beginning balance at Dec. 31, 2023	3,042,159		$ 159,822	$ 833		3,959,276		(1,160,474)	4,052	78,650
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income, excluding amounts attributable to redeemable noncontrolling interests	230,953							229,671		1,282
Other comprehensive income (loss) - change in fair value of interest rate swaps, excluding portion attributable to redeemable noncontrolling interests	(1,880)								(1,880)
Dividends declared to common shareholders	(275,006)							(275,006)
Dividends declared to preferred shareholders	(6,024)							(6,024)
Distributions declared to noncontrolling interests, excluding amounts attributable to redeemable noncontrolling interests	(3,183)									(3,183)
Common shares issued, net (in shares)				2,059,775
Common shares issued, net	222,319			$ 21		222,298
Shares issued under dividend reinvestment plan (in shares)				13,975
Shares issued under dividend reinvestment plan	1,323					1,323
Share-based compensation expense, net of forfeitures (in shares)				148,462
Share-based compensation expense, net of forfeitures	11,952			$ 1		11,951
Shares withheld for employee taxes (in shares)				(49,120)
Shares withheld for employee taxes	(4,972)					(4,972)
Conversion and redemption of downREIT OP units (in Shares)					4,160
Conversion and redemption of downREIT OP units					$ 0		287
Purchase of noncontrolling interest	(12,358)	(960)				(10,264)				(2,094)	(1,247)
Contributions from noncontrolling interests	725									725
Purchase of capped calls	(19,448)					(19,448)
Ending balance (in shares) at Sep. 30, 2024			398,878	84,952,538
Ending balance at Sep. 30, 2024	3,185,600		$ 159,822	$ 855		4,160,451		(1,211,833)	2,172	74,133
Beginning balance (in shares) at Jun. 30, 2024			398,878	83,590,543
Beginning balance at Jun. 30, 2024	3,070,813		$ 159,822	$ 841		4,005,249		(1,177,336)	7,042	75,195
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income, excluding amounts attributable to redeemable noncontrolling interests	61,719							60,953		766
Other comprehensive income (loss) - change in fair value of interest rate swaps, excluding portion attributable to redeemable noncontrolling interests	(4,870)								(4,870)
Dividends declared to common shareholders	(93,442)							(93,442)
Dividends declared to preferred shareholders	(2,008)							(2,008)
Distributions declared to noncontrolling interests, excluding amounts attributable to redeemable noncontrolling interests	(1,293)									(1,293)
Common shares issued, net (in shares)				1,358,977
Common shares issued, net	151,389			$ 14		151,375
Shares issued under dividend reinvestment plan (in shares)				4,542
Shares issued under dividend reinvestment plan	476					476
Share-based compensation expense, net of forfeitures (in shares)				1,080
Share-based compensation expense, net of forfeitures	3,777			$ 0		3,777
Shares withheld for employee taxes (in shares)				(2,604)
Shares withheld for employee taxes	(286)					(286)
Conversion and redemption of downREIT OP units (in Shares)					0
Conversion and redemption of downREIT OP units					$ 0
Purchase of noncontrolling interest		$ (675)					$ (140)				$ (535)
Ending balance (in shares) at Sep. 30, 2024			398,878	84,952,538
Ending balance at Sep. 30, 2024	$ 3,185,600		$ 159,822	$ 855		$ 4,160,451		$ (1,211,833)	$ 2,172	$ 74,133