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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, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Numerator: |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations | $ 9,341 us-gaap_IncomeLossFromContinuingOperations | $ 28,564 us-gaap_IncomeLossFromContinuingOperations | $ 11,365 us-gaap_IncomeLossFromContinuingOperations | $ 21,595 us-gaap_IncomeLossFromContinuingOperations | $ 7,576 us-gaap_IncomeLossFromContinuingOperations | $ 8,893 us-gaap_IncomeLossFromContinuingOperations | $ 7,967 us-gaap_IncomeLossFromContinuingOperations | $ 9,590 us-gaap_IncomeLossFromContinuingOperations | $ 70,865 us-gaap_IncomeLossFromContinuingOperations | $ 34,026 us-gaap_IncomeLossFromContinuingOperations | $ 23,619 us-gaap_IncomeLossFromContinuingOperations
Less: net income attributable to participating securities |  |  |  |  |  |  |  |  | 1,152 us-gaap_UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic | 581 us-gaap_UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic | 458 us-gaap_UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic
Income from continuing operations net of income |  |  |  |  |  |  |  |  | $ 69,713 us-gaap_UndistributedEarnings | $ 33,445 us-gaap_UndistributedEarnings | $ 23,161 us-gaap_UndistributedEarnings
Denominator: |  |  |  |  |  |  |  |  |  |  |
Weighted average shares for basic earnings per share |  |  |  |  |  |  |  |  | 59,402,000 us-gaap_WeightedAverageNumberOfSharesIssuedBasic | 54,919,000 us-gaap_WeightedAverageNumberOfSharesIssuedBasic | 45,854,000 us-gaap_WeightedAverageNumberOfSharesIssuedBasic
Effect of dilutive securities: |  |  |  |  |  |  |  |  |  |  |
Employee share options |  |  |  |  |  |  |  |  | 24,000 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements | 38,000 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements | 40,000 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Denominator for diluted earnings per share |  |  |  |  |  |  |  |  | 59,426,000 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 54,957,000 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 45,894,000 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Basic earnings per Common Share from continuing operations attributable to Common Shareholders (in dollars per share) | $ 0.13 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.47 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.19 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.38 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.14 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.16 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.14 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.18 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 1.18 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.61 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.51 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare
Diluted earnings per Common Share from continuing operations attributable to Common Shareholders (in dollars per share) | $ 0.15 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.47 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.19 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.38 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.14 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.16 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.14 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.18 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 1.18 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.61 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.51 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare
Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Schedule of Earnings Per Share, Basic and Diluted [Line Items] |  |  |  |  |  |  |  |  |  |  |
Antidilutive securities excluded from computation of earnings per share, amount |  |  |  |  |  |  |  |  | 25,067 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 25,067 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 25,067 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Operating Partnership, as General Partner or Managing Member [Member] |  |  |  |  |  |  |  |  |  |  |
Schedule of Earnings Per Share, Basic and Diluted [Line Items] |  |  |  |  |  |  |  |  |  |  |
Series A Preferred OP Units (in shares) | 2,988,277 us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = akr_OperatingPartnershipAsGeneralPartnerOrManagingMemberMember |  |  |  | 1,457,467 us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = akr_OperatingPartnershipAsGeneralPartnerOrManagingMemberMember |  |  |  | 2,988,277 us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = akr_OperatingPartnershipAsGeneralPartnerOrManagingMemberMember | 1,457,467 us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = akr_OperatingPartnershipAsGeneralPartnerOrManagingMemberMember |
Operating Partnership, as General Partner or Managing Member [Member] | Series A Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Schedule of Earnings Per Share, Basic and Diluted [Line Items] |  |  |  |  |  |  |  |  |  |  |
Series A Preferred OP Units (in shares) | 188 us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = akr_OperatingPartnershipAsGeneralPartnerOrManagingMemberMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember |  |  |  | 188 us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = akr_OperatingPartnershipAsGeneralPartnerOrManagingMemberMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember |  |  |  | 188 us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = akr_OperatingPartnershipAsGeneralPartnerOrManagingMemberMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember | 188 us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = akr_OperatingPartnershipAsGeneralPartnerOrManagingMemberMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember | 188 us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = akr_OperatingPartnershipAsGeneralPartnerOrManagingMemberMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember

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- Definition Amount of income (loss) from continuing operations attributable to the parent. Also defined as revenue less expenses and taxes from ongoing operations before extraordinary items but after deduction of those portions of income or loss from continuing operations that are allocable to noncontrolling interests. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=7656940&loc=SL4613673-111683 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.13) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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