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Stockholders' Equity of the Company - Earnings per Share (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Basic Earnings: |  |  |  |
Income attributable to SL Green common stockholders | $ 388,205 | $ 13,859 | $ 486,073 | $ 185,104
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
Effect of Dilutive Securities: |  |  |  |
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
Redemption of units to common shares | 22,683 | 802 | 28,489 | 10,073
Diluted Earnings: |  |  |  |
Income attributable to SL Green common stockholders | $ 410,888 | $ 14,661 | $ 514,562 | $ 195,177
Basic Shares: |  |  |  |
Weighted average common shares outstanding (shares) | 66,840,000 | 70,943,000 | 68,275,000 | 73,373,000
Effect of Dilutive Securities: |  |  |  |
Operating Partnership units redeemable for common shares (shares) | 3,834,000 | 4,029,000 | 4,024,000 | 4,123,000
Stock-based compensation plans (shares) | 813,000 | 442,000 | 684,000 | 441,000
Contingently issuable shares from special dividend declared December 4, 2020 (in shares) | 0 | 0 | 104,000 | 0
Diluted weighted average common stock 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 |  | 1,032,243 | 1,728,767

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