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Partners' Capital of the Operating Partnership - EPS (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
Numerator |  |  |  |  |  |  |  |  |  |  |
Net income attributable to SL Green common stockholders (numerator for basic earnings per share) |  |  |  |  |  |  |  |  | $ 253,745 | $ 231,760 | $ 85,953
Add back: Dilutive effect of earnings allocated to participating securities |  |  |  |  |  |  |  |  | $ 1,719 | $ 552 | $ 471
Denominator |  |  |  |  |  |  |  |  |  |  |
Weighted average common stock outstanding (in shares) |  |  |  |  |  |  |  |  | 81,733,000 | 86,753,000 | 98,571,000
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
SL Green Operating Partnership |  |  |  |  |  |  |  |  |  |  |
Numerator |  |  |  |  |  |  |  |  |  |  |
Net income attributable to SLGOP common unitholders | $ 18,426 | $ 34,876 | $ 169,413 | $ 46,070 | $ (64,658) | $ 93,006 | $ 109,142 | $ 107,038 | $ 268,785 | $ 244,528 | $ 90,419
Less: distributed earnings allocated to participating securities |  |  |  |  |  |  |  |  | (1,739) | (552) | (471)
Net income attributable to SL Green common stockholders (numerator for basic earnings per share) |  |  |  |  |  |  |  |  | 267,046 | 243,976 | 89,948
Add back: Dilutive effect of earnings allocated to participating securities |  |  |  |  |  |  |  |  | 1,719 | $ 552 | $ 471
Income attributable to SLGOP common unitholders |  |  |  |  |  |  |  |  | $ 268,765 |  |
Denominator |  |  |  |  |  |  |  |  |  |  |
Weighted average common stock outstanding (in shares) |  |  |  |  |  |  |  |  | 86,008,000 | 91,315,000 | 103,127,000
Stock-based compensation plans (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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