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Equity and Redeemable Noncontrolling Interests - Schedule of Other Common Stock Activities (Details) - Common Stock - shares shares in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Class of Stock [Line Items]
Dividend Reinvestment and Stock Purchase Plan (in shares)	81	181	336
Conversion of DownREIT units (in shares)	8	120	213
Exercise of stock options (in shares)	97	54	152
Vesting of restricted stock units (in shares)	924	668	468
Repurchase of common stock (in shares)	418	298	162

X

- Definition

Number of gross share options (or share units) exercised during the current period.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The number of shares issued during the period upon the conversion of units. An example of a convertible unit is an umbrella partnership real estate investment trust unit (UPREIT unit).

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Number of shares issued during the period from a dividend reinvestment plan (DRIP). A dividend reinvestment plan allows the shareholders to reinvest dividends paid to them by the entity on new issues of stock by the entity.

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Number of shares issued during the period related to Restricted Stock Awards, net of any shares forfeited.

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Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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