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SIGNIFICANT ACCOUNTING POLICIES (Details 6) (USD $) In Thousands, except Share data, unless otherwise specified | 0 Months Ended | 3 Months Ended | 12 Months Ended
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Sep. 14, 2010 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 item | Dec. 31, 2012 | Dec. 31, 2011
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 | 50,000
Underlying number of shares awarded under Pay-for-Performance program included in calculation of diluted weighted average number of shares | 200,000 |  |  |  |  |  |  |  |  |  |  |
Number of shares awarded under Pay-for-Performance program not included in diluted weighted average number of shares |  |  |  |  |  |  |  |  |  | 100,000 | 100,000 | 100,000
Outstanding options at the end of the period (in shares) |  | 0 |  |  |  | 0 |  |  |  | 0 | 0 | 0
Numerator for basic and diluted earnings per share: |  |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations |  | $ 3,405 | $ 3,084 | $ 7,607 | $ 3,313 | $ 2,491 | $ 2,867 | $ 3,137 | $ 2,833 | $ 17,409 | $ 11,328 | $ 11,088
Less net (income) loss attributable to noncontrolling interests |  |  |  |  |  |  |  |  |  | (49) | 12 | 4
Less earnings allocated to unvested shares |  |  |  |  |  |  |  |  |  | (667) |  | (460)
Income from continuing operations available for common stockholders |  |  |  |  |  |  |  |  |  | 16,693 | 11,340 | 10,632
Discontinued operations |  | 90 | 144 | 145 | 136 | 2,417 | 15,553 | 2,617 | 393 | 515 | 20,980 | 2,632
Net income available for common stockholders, basic |  |  |  |  |  |  |  |  |  | 17,208 | 32,320 | 13,264
Net income available for common stockholders, diluted |  |  |  |  |  |  |  |  |  | 17,208 | 32,320 | 13,264
Denominator for basic earnings per share: |  |  |  |  |  |  |  |  |  |  |  |
Weighted average common shares |  | 15,178,000 | 15,093,000 | 14,844,000 | 14,672,000 | 14,596,000 | 14,443,000 | 14,378,000 | 14,289,000 | 14,948,000 | 14,427,000 | 13,801,000
Weighted average unvested restricted stock shares |  |  |  |  |  |  |  |  |  |  | 411,000 |
Denominator for basic earnings per share (in shares) |  |  |  |  |  |  |  |  |  | 14,948,000 | 14,838,000 | 13,801,000
Effect of diluted securities: |  |  |  |  |  |  |  |  |  |  |  |
Restricted stock units awarded under Pay-for-Performance program (in shares) |  |  |  |  |  |  |  |  |  | 100,000 | 100,000 | 50,000
Denominator for diluted earnings per share - weighted average shares |  |  |  |  |  |  |  |  |  | 15,048,000 | 14,938,000 | 13,851,000
Earnings per common share, basic (in dollars per share) |  | $ 0.22 | $ 0.20 | $ 0.51 | $ 0.22 | $ 0.33 | $ 1.24 | $ 0.39 | $ 0.22 | $ 1.15 | $ 2.18 | $ 0.96
Earnings per common share, diluted (in dollars per share) |  | $ 0.22 | $ 0.20 | $ 0.50 | $ 0.22 | $ 0.33 | $ 1.23 | $ 0.39 | $ 0.21 | $ 1.14 | $ 2.16 | $ 0.96
Amounts attributable to One Liberty Properties, Inc. common stockholders, net of noncontrolling interests: |  |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations |  |  |  |  |  |  |  |  |  | 17,360 | 11,340 | 11,092
Income from discontinued operations |  |  |  |  |  |  |  |  |  | 515 | 20,980 | 2,632
Net income attributable to One Liberty Properties, Inc. |  | $ 3,478 | $ 3,211 | $ 7,736 | $ 3,450 | $ 4,933 | $ 18,414 | $ 5,750 | $ 3,223 | $ 17,875 | $ 32,320 | $ 13,724
Segment Reporting |  |  |  |  |  |  |  |  |  |  |  |
Number of operating segments |  |  |  |  |  |  |  |  |  | 1 |  |
Reclassification |  |  |  |  |  |  |  |  |  |  |  |
Number of properties sold, considered for reclassification |  |  |  |  |  |  |  |  |  | 2 |  |

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