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Stockholders' Equity of the Company - Earnings per Share (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Basic Earnings: |  |  |  |  |  |  |  |  |  |  |
Income attributable to SL Green common stockholders | $ 17,432 | $ 33,157 | $ 161,103 | $ 43,792 | $ (61,219) | $ 88,209 | $ 103,556 | $ 101,766 | $ 255,484 | $ 232,312 | $ 86,424
Net income attributable to SL Green common stockholders (numerator for basic earnings per share) |  |  |  |  |  |  |  |  | 253,745 | 231,760 | 85,953
Effect of Dilutive Securities: |  |  |  |  |  |  |  |  |  |  |
Add back: Dilutive effect of earnings allocated to participating securities |  |  |  |  |  |  |  |  | 1,719 | 552 | 471
Add back: Effect of dilutive securities (redemption of units to common shares) |  |  |  |  |  |  |  |  | 13,301 | 12,216 | 3,995
Diluted Earnings: |  |  |  |  |  |  |  |  |  |  |
Income attributable to SL Green common stockholders (numerator for diluted earnings per share) |  |  |  |  |  |  |  |  | $ 268,765 | $ 244,528 | $ 90,419
Basic Shares: |  |  |  |  |  |  |  |  |  |  |
Weighted average common stock outstanding (in shares) |  |  |  |  |  |  |  |  | 81,733,000 | 86,753,000 | 98,571,000
Effect of Dilutive Securities: |  |  |  |  |  |  |  |  |  |  |
Operating Partnership units redeemable for common shares (in shares) |  |  |  |  |  |  |  |  | 4,275,000 | 4,562,000 | 4,556,000
Stock-based compensation plans (in shares) |  |  |  |  |  |  |  |  | 554,000 | 215,000 | 276,000
Diluted weighted average common stock outstanding (in shares) |  |  |  |  |  |  |  |  | 86,562,000 | 91,530,000 | 103,403,000
Common stock shares excluded from the diluted shares outstanding (shares) |  |  |  |  |  |  |  |  | 1,252,670 | 1,138,647 | 774,782

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