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Stockholders' Equity of the Company (Tables) | 12 Months Ended
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Dec. 31, 2019
Stockholders' Equity Note [Abstract] |
Class of Treasury Stock | At December 31, 2019 repurchases executed under the program were as follows:
Period | Shares repurchased | Average price paid per share | Cumulative number of shares repurchased as part of the repurchase plan or programs
Year ended 2017 | 8,342,411 | $101.64 | 8,342,411
Year ended 2018 | 9,744,911 | $96.22 | 18,087,322
Year ended 2019 | 4,596,171 | $83.62 | 22,683,493
Schedule of Common Stock Issued and Proceeds Received Dividend Reinvestments | The following table summarizes SL Green common stock issued, and proceeds received from dividend reinvestments and/or stock purchases under the DRSPP for the years ended December 31, 2019, 2018, and 2017, respectively (dollars in thousands):
| Year Ended December 31,
| 2019 |  | 2018 |  | 2017
Shares of common stock issued | 3,867 |  |  | 1,399 |  |  | 2,141 |
Dividend reinvestments/stock purchases under the DRSPP | $ | 334 |  |  | $ | 136 |  |  | $ | 223 |
Schedule of Earnings Per Share | SL Green's earnings per share for the years ended December 31, 2019, 2018, and 2017 are computed as follows (in thousands):
| Year Ended December 31,
Numerator | 2019 |  | 2018 |  | 2017
Basic Earnings: |  |  |  |  |
Income attributable to SL Green common stockholders | $ | 255,484 |  |  | $ | 232,312 |  |  | $ | 86,424 |
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) | $ | 253,745 |  |  | $ | 231,760 |  |  | $ | 85,953 |
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 |
Income attributable to SL Green common stockholders (numerator for diluted earnings per share) | $ | 268,765 |  |  | $ | 244,528 |  |  | $ | 90,419 |
| Year Ended December 31,
Denominator | 2019 |  | 2018 |  | 2017
Basic Shares: |  |  |  |  |
Weighted average common stock outstanding | 81,733 |  |  | 86,753 |  |  | 98,571 |
Effect of Dilutive Securities: |  |  |  |  |
Operating Partnership units redeemable for common shares | 4,275 |  |  | 4,562 |  |  | 4,556 |
Stock-based compensation plans | 554 |  |  | 215 |  |  | 276 |
Diluted weighted average common stock outstanding | 86,562 |  |  | 91,530 |  |  | 103,403 |

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