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Stockholders' Equity of the Company - Earnings per Share (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Basic Earnings:    
Income attributable to SL Green common stockholders $ 7,751 $ (7,464)
Less: distributed earnings allocated to participating securities (335) (364)
Net Income attributable to common unitholders (numerator for basic earnings per unit) 7,416 (7,828)
Effect of Dilutive Securities:    
Add back: dilutive effect of earnings allocated to participating securities and contingently issuable shares (96) 7
Redemption of units to common shares 492 (476)
Diluted Earnings:    
Income attributable to SL Green common stockholders $ 7,812 $ (8,297)
Basic Shares:    
Weighted average common shares outstanding (shares) 64,349,000 66,961,000
Effect of Dilutive Securities:    
Operating Partnership units redeemable for common shares (shares) 4,121,000 4,148,000
Stock-based compensation plans (shares) 984,000 588,000
Contingently issuable shares from special dividend declared December 4, 2020 (in shares) 774,000 307,000
Diluted weighted average common stock outstanding (shares) 70,228,000 72,004,000
Common stock shares excluded from the diluted shares outstanding (shares) 351,927 1,124,920