Organization, Basis of Presentation and Significant Accounting Policies - Earnings per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Basic and diluted shares outstanding
Weighted average common shares - basic (in shares)	141,902,066	139,766,727
Weighted average DownREIT units outstanding (in shares)	0	7,500
Effect of dilutive securities (in shares)	320,689	249,583
Weighted average common shares - diluted (in shares)	142,222,755	140,023,810
Calculation of Earnings per Common Share - basic
Net income attributable to common stockholders	$ 173,449	$ 146,902
Net income allocated to unvested restricted shares	(338)	(267)
Net income attributable to common stockholders - basic	$ 173,111	$ 146,635
Weighted average common shares - basic (in shares)	141,902,066	139,766,727
Earnings per common share - basic (in dollars per share)	$ 1.22	$ 1.05
Calculation of Earnings per Common Share - diluted
Net income attributable to common stockholders	$ 173,449	$ 146,902
Add: noncontrolling interests of DownREIT unitholders in consolidated partnerships, including discontinued operations	0	12
Net income attributable to common stockholders - diluted	$ 173,449	$ 146,914
Weighted average common shares - diluted (in shares)	142,222,755	140,023,810
Earnings per common share - diluted (in dollars per share)	$ 1.22	$ 1.05
Antidilutive securities excluded from the computation of earnings per share (in shares)	309,339	307,625