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EARNINGS PER COMMON SHARE (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Jun. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Outstanding options at the end of the period (in shares) | 0 |  |  |  | 0 |  |  |  |  | 0 | 0 | 0
Numerator for basic and diluted earnings per share: |  |  |  |  |  |  |  |  |  |  |  |
Net income | $ 4,242 | $ 7,128 | $ 9,993 | $ 2,886 | $ 4,414 | $ 4,323 | $ 12,459 | $ 3,285 |  | $ 24,249 | $ 24,481 | $ 21,907
Less net income attributable to non-controlling interests |  |  |  |  |  |  |  |  |  | (102) | (59) | (1,390)
Less earnings allocated to unvested restricted stock |  |  |  |  |  |  |  |  |  | (1,072) | (999) | (852)
Net income available for common stockholders, basic |  |  |  |  |  |  |  |  |  | 23,075 | 23,423 | 19,665
Net income available for common stockholders, diluted |  |  |  |  |  |  |  |  |  | $ 23,075 | $ 23,423 | $ 19,665
Denominator for basic earnings per share: |  |  |  |  |  |  |  |  |  |  |  |
Weighted average number of common shares | 18,198,000 | 18,000,000 | 17,824,000 | 17,751,000 | 17,255,000 | 16,845,000 | 16,579,000 | 16,388,000 |  | 17,944,000 | 16,768,000 | 15,971,000
Effect of diluted securities: |  |  |  |  |  |  |  |  |  |  |  |
RSUs |  |  |  |  |  |  |  |  |  | 103,000 | 114,000 | 108,000
Denominator for diluted earnings per share: weighted average number of shares |  |  |  |  |  |  |  |  |  | 18,047,000 | 16,882,000 | 16,079,000
Earnings per common share, basic | $ 0.22 | $ 0.38 | $ 0.54 | $ 0.15 | $ 0.24 | $ 0.24 | $ 0.72 | $ 0.19 |  | $ 1.29 | $ 1.40 | $ 1.23
Earnings per common share, diluted | $ 0.22 | $ 0.38 | $ 0.54 | $ 0.15 | $ 0.24 | $ 0.24 | $ 0.72 | $ 0.18 |  | $ 1.28 | $ 1.39 | $ 1.22
Net income attributable to One Liberty Properties, Inc. common stockholders, net of non-controlling interests | $ 4,205 | $ 7,105 | $ 9,972 | $ 2,865 | $ 4,395 | $ 4,299 | $ 12,441 | $ 3,287 |  | $ 24,147 | $ 24,422 | $ 20,517
2009 Incentive Plan |  |  |  |  |  |  |  |  |  |  |  |
Number of underlying shares |  |  |  |  |  |  |  |  |  | 200,000 |  |
Effect of diluted securities: |  |  |  |  |  |  |  |  |  |  |  |
RSUs |  |  |  |  |  |  |  |  | 113,584 |  | 114,000 | 108,000
2016 Incentive Plan |  |  |  |  |  |  |  |  |  |  |  |
Number of underlying shares |  |  |  |  |  |  |  |  |  | 76,250 |  |
Number of shares included in diluted weighted average number of shares pursuant to return on capital performance metric |  |  |  |  |  |  |  |  |  | 33,353 |  |
Number of shares included in diluted weighted average number of shares pursuant to stockholder return metric |  |  |  |  |  |  |  |  |  | 38,125 |  |
Number of shares not included in diluted weighted average number of shares pursuant to return on capital performance metric |  |  |  |  |  |  |  |  |  | 4,772 |  |
Effect of diluted securities: |  |  |  |  |  |  |  |  |  |  |  |
RSUs |  |  |  |  |  |  |  |  |  | 71,478 |  |

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