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Stockholders' Equity of the Company - Earnings per Share (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Basic Earnings:    
Income attributable to SL Green common stockholders $ 101,766 $ 11,351
Diluted Earnings:    
Income attributable to SL Green common stockholders $ 107,038 $ 11,827
Basic Shares:    
Weighted average common shares outstanding (shares) 90,520,000 100,643,000
Effect of Dilutive Securities:    
Operating Partnership units redeemable for common shares (shares) 4,683,000 4,607,000
Stock-based compensation plans (shares) 53,000 304,000
Diluted weighted average common stock outstanding (shares) 95,256,000 105,554,000
Common stock shares excluded from the diluted shares outstanding (shares) 1,210,802 1,025,419
Common Stock    
Effect of Dilutive Securities:    
Redemption of units to common shares $ 5,272 $ 476