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Capital (Tables) | 12 Months Ended
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Dec. 31, 2019
Stockholders' Equity Note Disclosure, Disclosure of Compensation Related Costs, Share-based Payments and Earnings Per Share [Abstract] |
Dividends Declared | The following table summarizes the distributions paid on our operating partnership units for the years ended December 31, 2019, 2018 and 2017:
Record Date |  | Payment Date |  | Amount per Operating Partnership Unit
December 23, 2019 |  | December 31, 2019 |  | $0.105
September 16, 2019 |  | September 30, 2019 |  | $0.105
June 14, 2019 |  | June 28, 2019 |  | $0.105
March 15, 2019 |  | March 29, 2019 |  | $0.105
December 17, 2018 |  | December 31, 2018 |  | $0.105
September 14, 2018 |  | September 28, 2018 |  | $0.105
June 15, 2018 |  | June 29, 2018 |  | $0.105
March 15, 2018 |  | March 30, 2018 |  | $0.105
December 15, 2017 |  | December 29, 2017 |  | $0.105
September 15, 2017 |  | September 29, 2017 |  | $0.105
June 15, 2017 |  | June 30, 2017 |  | $0.105
March 15, 2017 |  | March 31, 2017 |  | $0.105
Summary of Restricted Stock and Long-Term Incentive Plan Activity | The following is a summary of ESRT restricted stock and LTIP unit activity for the year ended December 31, 2019:
| ESRT Restricted Stock |  | LTIP Units |  | Weighted Average Grant Fair Value
Unvested balance at December 31, 2018 | 91,158 |  |  | 5,702,821 |  |  | $ | 9.68 |
Vested | (35,724 | ) |  | (598,402 | ) |  | 15.98 |
Granted | 69,358 |  |  | 2,854,698 |  |  | 9.56 |
Forfeited or unearned | (5,874 | ) |  | (1,972,548 | ) |  | 7.34 |
Unvested balance at December 31, 2019 | 118,918 |  |  | 5,986,569 |  |  | $ | 9.73 |
Schedule of Earnings Per Unit, Basic and Diluted | Earnings per unit for the years ended December 31, 2019, 2018 and 2017 is computed as follows (amounts in thousands, except per share amounts):
| For the Year Ended December 31,
| 2019 |  | 2018 |  | 2017
Numerator: |  |  |  |  |
Net income | $ | 84,290 |  |  | $ | 117,253 |  |  | $ | 118,253 |
Private perpetual preferred unit distributions | (1,743 | ) |  | (936 | ) |  | (936 | )
Earnings allocated to unvested shares | (885 | ) |  | (851 | ) |  | (760 | )
Net income attributable to common unitholders - basic and diluted | $ | 81,662 |  |  | $ | 115,466 |  |  | $ | 116,557 |
Denominator: |  |  |  |  |
Weighted average units outstanding - basic | 297,798 |  |  | 297,258 |  |  | 296,455 |
Effect of dilutive securities: |  |  |  |  |
Stock-based compensation plans | — |  |  | 1 |  |  | 775 |
Exchangeable senior notes | — |  |  | — |  |  | 819 |
Weighted average shares outstanding - diluted | 297,798 |  |  | 297,259 |  |  | 298,049 |
Earnings per unit - basic and diluted | $ | 0.27 |  |  | $ | 0.39 |  |  | $ | 0.39 |

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