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Earnings Per Common Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 0 Months Ended | 3 Months Ended
--- | --- | ---
Sep. 14, 2010 | Mar. 31, 2013 | Mar. 31, 2012
Earnings Per Common Share |  |  |
Number of shares awarded under Pay-for-Performance program included in diluted weighted average number of shares |  | 100,000 | 100,000
Underlying number of shares awarded under Pay-for-Performance program included in calculation of diluted weighted average number of shares | 100,000 | 200,000 | 200,000
Number of shares awarded under Pay-for-Performance program not included in diluted weighted average number of shares |  | 100,000 | 100,000
Outstanding options at the end of the period (in shares) |  | 0 | 0
Numerator for basic and diluted earnings per share: |  |  |
Income from continuing operations |  | $ 3,449 | $ 2,962
Plus net loss (income) attributable to noncontrolling interests |  | 1 | (3)
Less earnings allocated to unvested shares |  | (165) | (135)
Income from continuing operations available for common stockholders |  | 3,285 | 2,824
Discontinued operations |  |  | 264
Net income available for common stockholders, basic |  | 3,285 | 3,088
Net income available for common stockholders, diluted |  | 3,285 | 3,088
Denominator for basic earnings per share |  |  |
Weighted average common shares |  | 14,672,000 | 14,289,000
Denominator for basic earnings per share (in shares) |  | 14,672,000 | 14,289,000
Effect of diluted securities |  |  |
Restricted stock units awarded under Pay-for-Performance program (in shares) |  | 100,000 | 100,000
Denominator for diluted earnings per share - weighted average shares |  | 14,772,000 | 14,389,000
Earnings per common share, basic (in dollars per share) |  | $ 0.22 | $ 0.22
Earnings per common share, diluted (in dollars per share) |  | $ 0.22 | $ 0.21
Amounts attributable to One Liberty Properties, Inc. common stockholders, net of noncontrolling interests: |  |  |
Income from continuing operations |  | 3,450 | 2,959
Income from discontinued operations |  |  | 264
Net income attributable to One Liberty Properties, Inc. |  | $ 3,450 | $ 3,223

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