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 (loss), excluding amounts attributable to redeemable noncontrolling interests	56,063							55,335		728
Other comprehensive income (loss) - change in fair value of interest rate swaps, excluding portion attributable to redeemable noncontrolling interests	(1,211)								(1,211)
Dividends declared to common shareholders	(88,033)							(88,033)
Dividends declared to preferred shareholders	(2,008)							(2,008)
Distributions declared to noncontrolling interests, excluding amounts attributable to redeemable noncontrolling interests	(1,048)									(1,048)
Common shares issued, net (in shares)				57,064
Common shares issued, net	6,251			$ 1		6,250
Shares issued under dividend reinvestment plan (in shares)				4,664
Shares issued under dividend reinvestment plan	423					423
Share-based compensation expense, net of forfeitures (in shares)				141,234
Share-based compensation expense, net of forfeitures	4,434			$ 1		4,433
Shares withheld for employee taxes (in shares)				(42,240)
Shares withheld for employee taxes	(4,645)					(4,645)
Conversion of downREIT OP units (in Shares)					7,523
Conversion of downREIT OP units					$ 0		$ 668
Conversion of downREIT OP units		$ 0									$ (668)
Ending balance (in shares) at Mar. 31, 2023			398,878	81,511,204
Ending balance at Mar. 31, 2023	3,004,241		$ 159,822	$ 820		3,828,930		(1,068,892)	4,546	79,015
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 (loss), excluding amounts attributable to redeemable noncontrolling interests	56,446							56,736		(290)
Other comprehensive income (loss) - change in fair value of interest rate swaps, excluding portion attributable to redeemable noncontrolling interests	2,847								2,847
Dividends declared to common shareholders	(90,479)							(90,479)
Dividends declared to preferred shareholders	(2,008)							(2,008)
Distributions declared to noncontrolling interests, excluding amounts attributable to redeemable noncontrolling interests	(798)									(798)
Common shares issued, net (in shares)				62,923
Common shares issued, net	6,377			$ 1		6,376
Shares issued under dividend reinvestment plan (in shares)				4,628
Shares issued under dividend reinvestment plan	355					355
Share-based compensation expense, net of forfeitures (in shares)				147,407
Share-based compensation expense, net of forfeitures	4,430			$ 1		4,429
Shares withheld for employee taxes (in shares)				(45,804)
Shares withheld for employee taxes	(4,614)					(4,614)
Conversion of downREIT OP units (in Shares)					4,160
Conversion of downREIT OP units					$ 0		$ 366
Conversion of downREIT OP units		$ 0									$ (366)
Contributions from noncontrolling interests	725									725
Purchase of capped calls	(19,448)					(19,448)
Ending balance (in shares) at Mar. 31, 2024			398,878	82,948,600
Ending balance at Mar. 31, 2024	$ 2,995,992		$ 159,822	$ 835		$ 3,946,740		$ (1,196,225)	$ 6,899	$ 77,921