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Partners' Capital of the Operating Partnership - EPS (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Numerator |  |  |  |
Less: distributed earnings allocated to participating securities | $ (363) | $ (333) | $ (1,090) | $ (777)
Less: undistributed earnings allocated to participating securities | (1,942) | 0 | (1,736) | (141)
Net Income attributable to common unitholders (numerator for basic earnings per unit) | 385,900 | 13,526 | 483,247 | 184,186
Add back: dilutive effect of earnings allocated to participating securities | (363) | (333) | (1,090) | (777)
Add back: undistributed earnings allocated to participating securities | (1,942) | 0 | (1,736) | (141)
Income attributable to SL Green common stockholders | $ 410,888 | 14,661 | $ 514,562 | $ 195,177
Denominator |  |  |  |
Common stock shares excluded from the diluted shares outstanding (shares) | 969,631 |  | 1,032,243 | 1,728,767
SL Green Operating Partnership |  |  |  |
Numerator |  |  |  |
Net income attributable to SLGOP common unitholders | $ 410,888 | 14,661 | $ 514,562 | $ 195,177
Less: distributed earnings allocated to participating securities | (363) | (333) | (1,090) | (777)
Less: undistributed earnings allocated to participating securities | (1,942) | 0 | (1,736) | (141)
Net Income attributable to common unitholders (numerator for basic earnings per unit) | 408,583 | 14,328 | 511,736 | 194,259
Add back: dilutive effect of earnings allocated to participating securities | 363 | 333 | 1,090 | 777
Add back: undistributed earnings allocated to participating securities | 1,942 | 0 | 1,736 | 141
Income attributable to SL Green common stockholders | $ 410,888 | $ 14,661 | $ 514,562 | $ 195,177
Denominator |  |  |  |
Basic weighted average common units outstanding (in shares) | 70,674,000 | 74,972,000 | 72,299,000 | 77,496,000
Stock-based compensation plans (shares) | 813,000 | 442,000 | 684,000 | 441,000
Contingently issuable units from special distribution declared December 4, 2020 (in shares) | 0 | 0 | 104,000 | 0
Diluted weighted average common units outstanding (shares) | 71,487,000 | 75,414,000 | 73,087,000 | 77,937,000
Common stock shares excluded from the diluted shares outstanding (shares) | 969,631 | 2,071,169 |  |

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