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EARNINGS PER COMMON SHARE (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Numerator: |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations | $ 8,682 | $ 6,238 | $ 5,677 | $ 3,437 | $ 3,462 | $ 3,514 | $ 3,841 | $ 7,897 | $ 24,034 | $ 18,713 | $ 28,233
Less: net income attributable to participating securities |  |  |  |  |  |  |  |  | 466 | 384 | 389
Income from continuing operations net of income |  |  |  |  |  |  |  |  | 23,568 | 18,329 | 27,844
Effect of dilutive securities: |  |  |  |  |  |  |  |  |  |  |
Preferred OP Unit distributions |  |  |  |  |  |  |  |  | 18 | 18 | 18
Numerator for diluted earnings per Common Share |  |  |  |  |  |  |  |  | $ 23,586 | $ 18,347 | $ 27,862
Denominator: |  |  |  |  |  |  |  |  |  |  |
Weighted average shares for basic earnings per share |  |  |  |  |  |  |  |  | 45,854,000 | 40,697,000 | 40,136,000
Effect of dilutive securities: |  |  |  |  |  |  |  |  |  |  |
Employee share options |  |  |  |  |  |  |  |  | 456,000 | 264,000 | 245,000
Convertible Preferred OP Units |  |  |  |  |  |  |  |  | 25,000 | 25,000 | 25,000
Dilutive potential Common Shares |  |  |  |  |  |  |  |  | 481,000 | 289,000 | 270,000
Denominator for diluted earnings per share | 50,582,584 | 46,812,349 | 44,673,565 | 43,146,093 | 42,066,390 | 40,628,781 | 40,633,317 | 40,580,173 | 46,335,000 | 40,986,000 | 40,406,000
Basic earnings per Common Share from continuing operations attributable to Common Shareholders | $ 0.17 | $ 0.13 | $ 0.13 | $ 0.08 | $ 0.08 | $ 0.09 | $ 0.09 | $ 0.19 | $ 0.51 | $ 0.45 | $ 0.69
Diluted earnings per Common Share from continuing operations attributable to Common Shareholders | $ 0.17 | $ 0.13 | $ 0.13 | $ 0.08 | $ 0.08 | $ 0.09 | $ 0.09 | $ 0.19 | $ 0.51 | $ 0.45 | $ 0.69
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount |  |  |  |  |  |  |  |  | 25,067 | 25,067 | 25,067
Series A Preferred Stock [Member] | Acadia Realty, LP [Member] |  |  |  |  |  |  |  |  |  |  |
Schedule of Earnings Per Share, Basic and Diluted [Line Items] |  |  |  |  |  |  |  |  |  |  |
Series A Preferred OP Units | 188 |  |  |  | 188 |  |  |  | 188 | 188 | 188

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