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Earnings Per Common Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Dec. 31, 2014
Earnings Per Common Share |  |  |  |  |
Number of shares awarded under Pay-for-Performance program included in diluted weighted average number of shares | 100,000 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements |  | 100,000 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements |  |
Underlying number of shares awarded under Pay-for-Performance program included in calculation of diluted weighted average number of shares | 200,000 olp_IncrementalCommonSharesAttributableToShareBasedPaymentArrangementsUnderlyingShares |  | 200,000 olp_IncrementalCommonSharesAttributableToShareBasedPaymentArrangementsUnderlyingShares |  |
Number of shares awarded under Pay-for-Performance program not included in diluted weighted average number of shares | 100,000 olp_IncrementalCommonSharesNotIncludedInComputationOfEarningPerShare |  | 100,000 olp_IncrementalCommonSharesNotIncludedInComputationOfEarningPerShare |  |
Outstanding options at the end of the period (in shares) | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber |  | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber |  | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Numerator for basic and diluted earnings per share: |  |  |  |  |
Income from continuing operations | $ 9,207 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest |  | $ 3,287 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest |  |
Net income attributable to non-controlling interests | (1,351)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest |  | (27)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest |  |
Less earnings allocated to unvested restricted stock | (261)us-gaap_ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic | [1] | (178)us-gaap_ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic | [1] |
Income from continuing operations available for common stockholders | 7,595 olp_NetIncomeLossFromContinuingOperationsAvailableToCommonStockholders |  | 3,082 olp_NetIncomeLossFromContinuingOperationsAvailableToCommonStockholders |  |
Discontinued operations |  |  | 13 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax |  |
Net income available for common stockholders, basic | 7,595 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic |  | 3,095 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic |  |
Net income available for common stockholders, diluted | 7,595 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted |  | 3,095 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted |  |
Denominator for basic earnings per share: |  |  |  |  |
Weighted average common shares | 15,776,000 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic |  | 15,356,000 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic |  |
Effect of diluted securities: |  |  |  |  |
Restricted stock units awarded under Pay-for-Performance program (in shares) | 100,000 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements |  | 100,000 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements |  |
Denominator for diluted earnings per share - weighted average shares | 15,876,000 olp_WeightedAverageNumberOfDilutedSharesIncludingUnvestedRestrictedStockSharesOutstanding |  | 15,456,000 olp_WeightedAverageNumberOfDilutedSharesIncludingUnvestedRestrictedStockSharesOutstanding |  |
Earnings per common share, basic (in dollars per share) | $ 0.48 us-gaap_EarningsPerShareBasic |  | $ 0.20 us-gaap_EarningsPerShareBasic |  |
Earnings per common share, diluted (in dollars per share) | $ 0.48 us-gaap_EarningsPerShareDiluted |  | $ 0.20 us-gaap_EarningsPerShareDiluted |  |
Net income attributable to One Liberty Properties, Inc. common stockholders, net of non-controlling interests: |  |  |  |  |
Income from continuing operations | 7,856 us-gaap_IncomeLossFromContinuingOperations |  | 3,260 us-gaap_IncomeLossFromContinuingOperations |  |
Income from discontinued operations |  |  | 13 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity |  |
Net income attributable to One Liberty Properties, Inc. | $ 7,856 us-gaap_NetIncomeLoss |  | $ 3,273 us-gaap_NetIncomeLoss |  |
[1] | Represents an allocation to unvested restricted stock, which as participating securities are entitled to receive dividends.

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