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Partners' Capital of the Operating Partnership (Tables) | 9 Months Ended
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Sep. 30, 2020
Equity [Abstract] |
Schedule of calculation of numerator and denominator in earnings per unit | The Operating Partnership's earnings per unit for the three and nine months ended September 30, 2020 and 2019, respectively, are computed as follows (in thousands):
| Three Months Ended September 30, |  | Nine Months Ended September 30,
Numerator | 2020 |  | 2019 |  | 2020 |  | 2019
Basic Earnings: |  |  |  |  |  |  |
Income attributable to SLGOP common unitholders | $ | 14,661 |  |  | $ | 34,876 |  |  | $ | 195,177 |  |  | $ | 250,358 |
Less: distributed earnings allocated to participating securities | (333) |  |  | (108) |  |  | (777) |  |  | (325) |
Less: undistributed earnings allocated to participating securities | — |  |  | — |  |  | (141) |  |  | (41) |
Net Income attributable to SLGOP common unitholders (numerator for basic earnings per unit) | $ | 14,328 |  |  | $ | 34,768 |  |  | $ | 194,259 |  |  | $ | 249,992 |
Add back: dilutive effect of earnings allocated to participating securities | 333 |  |  | 108 |  |  | 777 |  |  | 325 |
Add back: undistributed earnings allocated to participating securities | — |  |  | — |  |  | 141 |  |  | 41 |
Income attributable to SLGOP common unitholders (numerator for diluted earnings per unit) | $ | 14,661 |  |  | $ | 34,876 |  |  | $ | 195,177 |  |  | $ | 250,358 |
| Three Months Ended September 30, |  | Nine Months Ended September 30,
Denominator | 2020 |  | 2019 |  | 2020 |  | 2019
Basic units: |  |  |  |  |  |  |
Weighted average common units outstanding | 77,049 |  |  | 86,550 |  |  | 79,644 |  |  | 87,138 |
Effect of Dilutive Securities: |  |  |  |  |  |  |
Stock-based compensation plans | 442 |  |  | 164 |  |  | 441 |  |  | 171 |
Diluted weighted average common units outstanding | 77,491 |  |  | 86,714 |  |  | 80,085 |  |  | 87,309 |

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