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Earnings Per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Numerator: |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations |  |  |  |  |  |  |  |  | $ 72,776 | $ 65,708 | $ 70,865
Less: net income attributable to participating securities |  |  |  |  |  |  |  |  | (793) | (927) | (1,152)
Income from continuing operations net of income attributable to participating securities |  |  |  |  |  |  |  |  | $ 71,983 | $ 64,781 | $ 69,713
Denominator: |  |  |  |  |  |  |  |  |  |  |
Weighted average shares for basic earnings per share |  |  |  |  |  |  |  |  | 76,231,000 | 68,851,000 | 59,402,000
Effect of dilutive securities: |  |  |  |  |  |  |  |  |  |  |
Employee share options |  |  |  |  |  |  |  |  | 13,000 | 19,000 | 24,000
Denominator for diluted earnings per share | 82,728,000 | 78,624,000 | 72,896,000 | 71,215,000 | 69,330,000 | 68,957,000 | 68,870,000 | 68,360,000 | 76,244,000 | 68,870,000 | 59,426,000
Basic earnings per Common Share from continuing operations attributable to Acadia (in dollars per share) |  |  |  |  |  |  |  |  | $ 0.94 | $ 0.94 | $ 1.18
Diluted earnings per Common Share from continuing operations attributable to Acadia (in dollars per share) |  |  |  |  |  |  |  |  | $ 0.94 | $ 0.94 | $ 1.18
Series A Preferred Stock [Member] | Common Shares |  |  |  |  |  |  |  |  |  |  |
Schedule of Earnings Per Share, Basic and Diluted [Line Items] |  |  |  |  |  |  |  |  |  |  |
Antidilutive securities excluded from computation of earnings per share (in shares) |  |  |  |  |  |  |  |  | 25,067 | 25,067 | 25,067
Series C Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Schedule of Earnings Per Share, Basic and Diluted [Line Items] |  |  |  |  |  |  |  |  |  |  |
Preferred OP Units (in shares) | 141,593 |  |  |  |  |  |  |  | 141,593 |  |
Series C Preferred Stock [Member] | Common Shares |  |  |  |  |  |  |  |  |  |  |
Schedule of Earnings Per Share, Basic and Diluted [Line Items] |  |  |  |  |  |  |  |  |  |  |
Antidilutive securities excluded from computation of earnings per share (in shares) |  |  |  |  |  |  |  |  | 407,845 |  |
Operating Partnership, as General Partner or Managing Member [Member] |  |  |  |  |  |  |  |  |  |  |
Schedule of Earnings Per Share, Basic and Diluted [Line Items] |  |  |  |  |  |  |  |  |  |  |
Preferred OP Units (in shares) | 3,365,668 |  |  |  | 2,931,198 |  |  |  | 3,365,668 | 2,931,198 |
Operating Partnership, as General Partner or Managing Member [Member] | Series A Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Schedule of Earnings Per Share, Basic and Diluted [Line Items] |  |  |  |  |  |  |  |  |  |  |
Preferred OP Units (in shares) | 188 |  |  |  | 188 |  |  |  | 188 | 188 | 188
Operating Partnership, as General Partner or Managing Member [Member] | Series C Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Schedule of Earnings Per Share, Basic and Diluted [Line Items] |  |  |  |  |  |  |  |  |  |  |
Preferred OP Units (in shares) |  | 141,593 |  |  |  |  |  |  |  |  |

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