Organization, Basis of Presentation and Significant Accounting Policies - Earnings per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2023	Jun. 30, 2022
Basic and diluted shares outstanding
Weighted average common shares - basic (in shares)	141,779,951		139,630,291		140,773,339	139,595,098
Weighted average DownREIT units outstanding (in shares)	6,511		7,500		7,005	7,500
Effect of dilutive securities (in shares)	337,655		296,687		293,620	352,682
Weighted average common shares - diluted (in shares)	142,124,117		139,934,478		141,073,964	139,955,280
Calculation of Earnings per Share - basic
Net income attributable to common stockholders	$ 367,923	$ 146,902	$ 138,691	$ 262,044	$ 514,825	$ 400,735
Net income allocated to unvested restricted shares	(645)		(247)		(919)	(756)
Net income attributable to common stockholders - basic	$ 367,278		$ 138,444		$ 513,906	$ 399,979
Weighted average common shares - basic (in shares)	141,779,951		139,630,291		140,773,339	139,595,098
Earnings per common share - basic (in dollars per share)	$ 2.59		$ 0.99		$ 3.65	$ 2.87
Calculation of Earnings per Share - diluted
Net income attributable to common stockholders	$ 367,923	$ 146,902	$ 138,691	$ 262,044	$ 514,825	$ 400,735
Add: noncontrolling interests of DownREIT unitholders in consolidated partnerships, including discontinued operations	13		12		25	24
Net income attributable to common stockholders - diluted	$ 367,936		$ 138,703		$ 514,850	$ 400,759
Weighted average common shares - diluted (in shares)	142,124,117		139,934,478		141,073,964	139,955,280
Earnings per common share - diluted (in dollars per share)	$ 2.59		$ 0.99		$ 3.65	$ 2.86
Antidilutive securities excluded from the computation of earnings per share (in shares)					303,784	8,222