Equity - Schedule of Other Common Stock Activities (Details) - Common Stock - shares shares in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Class of Stock [Line Items]
Dividend Reinvestment and Stock Purchase Plan (in shares)	181	336	237
Conversion of DownREIT units (in shares)	120	213	3
Exercise of stock options (in shares)	54	152	120
Vesting of restricted stock units (in shares)	668	468	401
Repurchase of common stock (in shares)	298	162	141