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	117,516							115,834		1,682
Other comprehensive income (loss) - change in fair value of interest rate swaps, excluding portion attributable to redeemable noncontrolling interests	(261)								(261)
Dividends declared to common shareholders	(176,064)							(176,064)
Dividends declared to preferred shareholders	(4,016)							(4,016)
Distributions declared to noncontrolling interests, excluding amounts attributable to redeemable noncontrolling interests	(2,202)									(2,202)
Common shares issued, net (in shares)				57,096
Common shares issued, net	6,192			$ 1		6,191
Shares issued under dividend reinvestment plan (in shares)				9,631
Shares issued under dividend reinvestment plan	905					905
Share-based compensation expense, net of forfeitures (in shares)				141,234
Share-based compensation expense, net of forfeitures	8,130			$ 1		8,129
Shares withheld for employee taxes (in shares)				(42,932)
Shares withheld for employee taxes	(4,711)					(4,711)
Conversion and redemption of downREIT OP units (in Shares)					7,523
Conversion and redemption of downREIT OP units					$ 0		$ 668
Purchase of noncontrolling interest		$ 0									$ (668)
Contributions from noncontrolling interests	927									927
Ending balance (in shares) at Jun. 30, 2023			398,878	81,515,511
Ending balance at Jun. 30, 2023	2,980,431		$ 159,822	$ 820		3,832,983		(1,098,432)	5,496	79,742
Beginning balance (in shares) at Mar. 31, 2023			398,878	81,511,204
Beginning balance at Mar. 31, 2023	3,004,241		$ 159,822	$ 820		3,828,930		(1,068,892)	4,546	79,015
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income, excluding amounts attributable to redeemable noncontrolling interests	61,453							60,499		954
Other comprehensive income (loss) - change in fair value of interest rate swaps, excluding portion attributable to redeemable noncontrolling interests	950								950
Dividends declared to common shareholders	(88,031)							(88,031)
Dividends declared to preferred shareholders	(2,008)							(2,008)
Distributions declared to noncontrolling interests, excluding amounts attributable to redeemable noncontrolling interests	(1,154)									(1,154)
Common shares issued, net (in shares)				32
Common shares issued, net	(59)			$ 0		(59)
Shares issued under dividend reinvestment plan (in shares)				4,967
Shares issued under dividend reinvestment plan	482					482
Share-based compensation expense, net of forfeitures (in shares)				0
Share-based compensation expense, net of forfeitures	3,696			$ 0		3,696
Shares withheld for employee taxes (in shares)				(692)
Shares withheld for employee taxes	(66)					(66)
Contributions from noncontrolling interests	927									927
Ending balance (in shares) at Jun. 30, 2023			398,878	81,515,511
Ending balance at Jun. 30, 2023	2,980,431		$ 159,822	$ 820		3,832,983		(1,098,432)	5,496	79,742
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	169,234							168,718		516
Other comprehensive income (loss) - change in fair value of interest rate swaps, excluding portion attributable to redeemable noncontrolling interests	2,990								2,990
Dividends declared to common shareholders	(181,564)							(181,564)
Dividends declared to preferred shareholders	(4,016)							(4,016)
Distributions declared to noncontrolling interests, excluding amounts attributable to redeemable noncontrolling interests	(1,890)									(1,890)
Common shares issued, net (in shares)				700,798
Common shares issued, net	70,930			$ 7		70,923
Shares issued under dividend reinvestment plan (in shares)				9,433
Shares issued under dividend reinvestment plan	847					847
Share-based compensation expense, net of forfeitures (in shares)				147,382
Share-based compensation expense, net of forfeitures	8,175			$ 1		8,174
Shares withheld for employee taxes (in shares)				(46,516)
Shares withheld for employee taxes	(4,686)					(4,686)
Conversion and redemption of downREIT OP units (in Shares)					4,160
Conversion and redemption of downREIT OP units					$ 0		427
Purchase of noncontrolling interest	(12,358)	(285)				(10,264)				(2,094)	(712)
Contributions from noncontrolling interests	725									725
Purchase of capped calls	(19,448)					(19,448)
Ending balance (in shares) at Jun. 30, 2024			398,878	83,590,543
Ending balance at Jun. 30, 2024	3,070,813		$ 159,822	$ 841		4,005,249		(1,177,336)	7,042	75,195
Beginning balance (in shares) at Mar. 31, 2024			398,878	82,948,600
Beginning balance at Mar. 31, 2024	2,995,992		$ 159,822	$ 835		3,946,740		(1,196,225)	6,899	77,921
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income, excluding amounts attributable to redeemable noncontrolling interests	112,788							111,982		806
Other comprehensive income (loss) - change in fair value of interest rate swaps, excluding portion attributable to redeemable noncontrolling interests	143								143
Dividends declared to common shareholders	(91,085)							(91,085)
Dividends declared to preferred shareholders	(2,008)							(2,008)
Distributions declared to noncontrolling interests, excluding amounts attributable to redeemable noncontrolling interests	(1,092)									(1,092)
Common shares issued, net (in shares)				637,875
Common shares issued, net	64,553			$ 6		64,547
Shares issued under dividend reinvestment plan (in shares)				4,805
Shares issued under dividend reinvestment plan	492					492
Share-based compensation expense, net of forfeitures (in shares)				(25)
Share-based compensation expense, net of forfeitures	3,745			$ 0		3,745
Shares withheld for employee taxes (in shares)				(712)
Shares withheld for employee taxes	(72)					(72)
Conversion and redemption of downREIT OP units (in Shares)					0
Conversion and redemption of downREIT OP units					$ 0		$ 61
Purchase of noncontrolling interest	(12,358)	$ (285)				(10,264)				(2,094)	$ (346)
Ending balance (in shares) at Jun. 30, 2024			398,878	83,590,543
Ending balance at Jun. 30, 2024	$ 3,070,813		$ 159,822	$ 841		$ 4,005,249		$ (1,177,336)	$ 7,042	$ 75,195