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Earnings Per Common Share - Schedule of Earnings Per Share, Basic and Diluted (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Numerator:
Net income (loss) attributable to Acadia	$ 12,069	$ (9,030)	$ 21,149	$ 1,966
Less: net income attributable to participating securities	(156)	0	(468)	(233)
Income (loss) from continuing operations net of income attributable to participating securities	$ 11,913	$ (9,030)	$ 20,681	$ 1,733
Denominator:
Weighted average shares for basic earnings per share (in shares)	88,480,844	86,308,500	87,217,422	86,486,017
Effect of dilutive securities:
Employee unvested restricted shares (in shares)	0	0	0	0
Denominator for diluted earnings per share (in shares)	88,480,844	86,308,500	87,217,422	86,486,017
Basic and diluted earnings and basic loss per Common Share from continuing operations attributable to Acadia	$ 0.13	$ (0.10)	$ 0.24	$ 0.02
Series A Preferred OP Units
Anti-Dilutive Shares Excluded from Denominator:
Antidilutive securities excluded from computation of earnings per share (in shares)	188	188	188	188
Series A Preferred OP Units - Common Share Equivalent
Anti-Dilutive Shares Excluded from Denominator:
Antidilutive securities excluded from computation of earnings per share (in shares)	25,067	25,067	25,067	25,067
Series C Preferred OP Units
Anti-Dilutive Shares Excluded from Denominator:
Antidilutive securities excluded from computation of earnings per share (in shares)	126,593	126,593	126,593	126,593
Series C Preferred OP Units - Common Share Equivalent
Anti-Dilutive Shares Excluded from Denominator:
Antidilutive securities excluded from computation of earnings per share (in shares)	439,556	439,556	439,556	439,556
Restricted shares
Anti-Dilutive Shares Excluded from Denominator:
Antidilutive securities excluded from computation of earnings per share (in shares)	70,827	76,394	70,827	76,394

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