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(Loss) Earnings Per Common Share - Schedule of Earnings Per Share, Basic and Diluted (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Numerator: |  |  |
Net (loss) income attributable to Acadia | $ (8,759) | $ 53,045 | $ 31,439
Less: net income attributable to participating securities | (233) | (413) | (267)
(Loss) income from continuing operations net of income attributable to participating securities | $ (8,992) | $ 52,632 | $ 31,172
Denominator: |  |  |
Weighted average shares for basic earnings per share (in shares) | 86,441,922 | 84,435,826 | 82,080,159
Effect of dilutive securities: |  |  |
Employee unvested restricted shares (in shares) | 0 | 0 | 0
Denominator for diluted earnings per share (in shares) | 86,441,922 | 84,435,826 | 82,080,159
Basic (loss) income and diluted earnings per Common Share from continuing operations attributable to Acadia | $ (0.10) | $ 0.62 | $ 0.38
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
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
Series C Preferred OP Units |  |  |
Anti-Dilutive Shares Excluded from Denominator: |  |  |
Antidilutive securities excluded from computation of earnings per share (in shares) | 126,593 | 136,593 | 136,593
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 | 474,278 | 474,278
Restricted shares |  |  |
Anti-Dilutive Shares Excluded from Denominator: |  |  |
Antidilutive securities excluded from computation of earnings per share (in shares) | 76,394 | 40,821 | 36,879

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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- Definition The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=121326447&loc=d3e1337-109256 + Details
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