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Organization, Basis of Presentation and Significant Accounting Policies (Details 2) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Basic and diluted shares outstanding
Weighted average common shares - basic (in shares)	138,331,248	137,764,468
Weighted average DownREIT units outstanding (in shares)	7,500	7,500
Effect of dilutive securities (in shares)	493,453	381,202
Weighted average common shares - diluted (in shares)	138,832,201	138,153,170
Calculation of Earnings per Share - basic
Net income attributable to common stockholders	$ 170,366	$ 141,643
Net income allocated to unvested restricted shares	(501)	(430)
Net income attributable to common stockholders, adjusted	$ 169,865	$ 141,213
Weighted average common shares - basic (in shares)	138,331,248	137,764,468
Earnings per common share - basic (in dollars per share)	$ 1.23	$ 1.03
Calculation of Earnings per Share - diluted
Net income attributable to common stockholders	$ 170,366	$ 141,643
Add: noncontrolling interests of DownREIT unitholders in consolidated partnerships	11	11
Adjusted net income attributable to common stockholders	$ 170,377	$ 141,654
Weighted average common shares - diluted (in shares)	138,832,201	138,153,170
Earnings per common share - diluted (in dollars per share)	$ 1.23	$ 1.03

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