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Stockholders' Equity of the Company - Earnings per Share (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Basic Earnings: |  |  |  |
Income attributable to SL Green common stockholders | $ 103,556 | $ 8,222 | $ 205,322 | $ 19,573
Diluted Earnings: |  |  |  |
Income attributable to SL Green common stockholders | $ 109,142 | $ 8,641 | $ 216,180 | $ 20,468
Basic Shares: |  |  |  |
Weighted average common shares outstanding (shares) | 87,176,000 | 99,900,000 | 88,772,000 | 100,268,000
Effect of Dilutive Securities: |  |  |  |
Operating Partnership units redeemable for common shares (shares) | 4,706,000 | 4,562,000 | 4,695,000 | 4,584,000
Stock-based compensation plans (shares) | 201,000 | 270,000 | 200,000 | 288,000
Diluted weighted average common stock outstanding (shares) | 92,083,000 | 104,732,000 | 93,667,000 | 105,140,000
Common stock shares excluded from the diluted shares outstanding (shares) | 1,158,317 |  | 1,184,735 |
Common Stock |  |  |  |
Effect of Dilutive Securities: |  |  |  |
Redemption of units to common shares | $ 5,586 | $ 419 | $ 10,858 | $ 895

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