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Stockholders' Equity of the Company - Earnings per Share (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Basic Earnings: |  |  |  |
(Loss) income attributable to SL Green common stockholders |  | $ (579,509) | $ (93,024) | $ 434,804
Less: distributed earnings allocated to participating securities |  | (2,655) | (2,219) | (2,398)
Less: undistributed earnings allocated to participating securities |  | 0 | 0 | (192)
Net (loss) income attributable to SL Green common stockholders (numerator for basic earnings per share) |  | (582,164) | (95,243) | 432,214
Effect of Dilutive Securities: |  |  |  |
Add back: dilutive effect of earnings allocated to participating securities and contingently issuable shares |  | 0 | 0 | 2,039
Add back: undistributed earnings allocated to participating securities |  | 0 | 0 | 192
Add back: effect of dilutive securities (redemption of units to common shares) |  | (37,465) | (5,794) | 25,457
Net (loss) income attributable to SL Green common stockholders, diluted |  | $ (619,629) | $ (101,037) | $ 459,902
Basic Shares: |  |  |  |
Weighted average common stock outstanding (in shares) |  | 63,809,000 | 63,917,000 | 65,740,000
Effect of Dilutive Securities: |  |  |  |
Operating Partnership units redeemable for common shares (in shares) |  | 4,163,000 | 4,012,000 | 3,987,000
Stock-based compensation plans (in shares) |  | 0 | 0 | 705,000
Contingently issuable shares from special dividend declared December 4, 2020 (in shares) |  | 0 | 0 | 337,000
Diluted weighted average common stock outstanding (in shares) |  | 67,972,000 | 67,929,000 | 70,769,000
Common stock shares excluded from the diluted shares outstanding (in shares) |  | 1,273,417 | 1,682,236 | 948,017

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