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SIGNIFICANT ACCOUNTING POLICIES (Details 6) (USD $) In Thousands, except Share data, unless otherwise specified | 0 Months Ended | 1 Months Ended | 3 Months Ended | 12 Months Ended
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Sep. 14, 2010 | Feb. 28, 2011 | 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 item | Dec. 31, 2011 | Dec. 31, 2010
Earnings Per Common Share |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares sold |  | 2,700,000 |  |  |  |  |  |  |  |  |  |  |
Number of shares awarded under Pay-for-Performance program included in diluted weighted average number of shares |  |  |  |  |  |  |  |  |  |  | 100,000 | 50,000 | 30,000
Underlying number of shares awarded under Pay-for-Performance program included in calculation of diluted weighted average number of shares | 100,000 |  |  |  |  |  |  |  |  |  |  |  |
Number of shares awarded under Pay-for-Performance program not included in diluted weighted average number of shares |  |  |  |  |  |  |  |  |  |  | 100,000 | 100,000 | 100,000
Numerator for basic and diluted earnings per share: |  |  |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations |  |  | $ 2,627 | $ 3,001 | $ 3,266 | $ 2,962 | $ 2,827 | $ 2,538 | $ 3,880 | $ 2,327 | $ 11,856 | $ 11,572 | $ 7,438
Plus net loss attributable to noncontrolling interests |  |  |  |  |  |  |  |  |  |  | 12 | 4 |
Less earnings allocated to unvested shares |  |  |  |  |  |  |  |  |  |  |  | (460) |
Income from continuing operations available for common stockholders |  |  |  |  |  |  |  |  |  |  | 11,868 | 11,116 |
Discontinued operations |  |  | 2,281 | 15,419 | 2,488 | 264 | 254 | 227 | 1,262 | 405 | 20,452 | 2,148 | 1,868
Net income available for common stockholders, basic |  |  |  |  |  |  |  |  |  |  | 32,320 | 13,264 |
Net income available for common stockholders, diluted |  |  |  |  |  |  |  |  |  |  | 32,320 | 13,264 |
Denominator for basic earnings per share: |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average common shares |  |  | 14,596,000 | 14,443,000 | 14,378,000 | 14,289,000 | 14,210,000 | 14,143,000 | 14,078,000 | 13,117,000 | 14,427,000 | 13,801,000 | 11,465,000
Weighted average unvested restricted stock shares |  |  |  |  |  |  |  |  |  |  | 411,000 |  |
Denominator for basic earnings per share (in shares) |  |  |  |  |  |  |  |  |  |  | 14,838,000 | 13,801,000 |
Effect of diluted securities |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted stock units awarded under Pay-for-Performance program (in shares) |  |  |  |  |  |  |  |  |  |  | 100,000 | 50,000 | 30,000
Denominator for diluted earnings per share - weighted average shares |  |  |  |  |  |  |  |  |  |  | 14,938,000 | 13,851,000 |
Earnings per common share, basic (in dollars per share) |  |  | $ 0.33 | $ 1.24 | $ 0.39 | $ 0.22 | $ 0.21 | $ 0.19 | $ 0.36 | $ 0.21 | $ 2.18 | $ 0.96 | $ 0.81
Earnings per common share, diluted (in dollars per share) |  |  | $ 0.33 | $ 1.23 | $ 0.39 | $ 0.21 | $ 0.21 | $ 0.19 | $ 0.35 | $ 0.21 | $ 2.16 | $ 0.96 | $ 0.81
Amounts attributable to One Liberty Properties, Inc. common stockholders, net of noncontrolling interests: |  |  |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations |  |  |  |  |  |  |  |  |  |  | 11,868 | 11,576 |
Income from discontinued operations |  |  |  |  |  |  |  |  |  |  | 20,452 | 2,148 |
Net income attributable to One Liberty Properties, Inc. |  |  | $ 4,933 | $ 18,414 | $ 5,750 | $ 3,223 | $ 3,085 | $ 2,765 | $ 5,142 | $ 2,732 | $ 32,320 | $ 13,724 | $ 9,306
Segment Reporting |  |  |  |  |  |  |  |  |  |  |  |  |
Number of operating segments |  |  |  |  |  |  |  |  |  |  | 1 |  |
Reclassification |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties sold, whose transferred assets and liabilities, are considered for reclassification |  |  |  |  |  |  |  |  |  |  | 5 |  |

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