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Net Income Per Common Share and Net Income Per Common Unit (Tables) | 12 Months Ended
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Dec. 31, 2016
Net Income Per Share and Net Income Per Unit [Line Items] |
Net Income Per Common Share and Net Income Per Unit | Basic and diluted income per share is calculated as follows for the years ended December 31 ($ in thousands, except share and per share amounts):
| 2016 |  | 2015 |  | 2014
| Income |  | Weighted- average Common Shares |  | Per Common Share Amount |  | Income |  | Weighted- average Common Shares |  | Per Common Share Amount |  | Income |  | Weighted- average Common Shares |  | Per Common Share Amount
Basic: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income available to common stockholders | 411,124 |  |  | 65,471,540 |  |  | $ | 6.28 |  |  | 226,865 |  |  | 64,871,717 |  |  | $ | 3.50 |  |  | 116,859 |  |  | 56,546,959 |  |  | $ | 2.07 |
Effect of Dilutive Securities (1) | — |  |  | 116,276 |  |  |  |  |  | — |  |  | 189,968 |  |  |  |  |  | — |  |  | 149,566 |  |  |  |
Diluted: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income available to common stockholders | 411,124 |  |  | 65,587,816 |  |  | $ | 6.27 |  |  | 226,865 |  |  | 65,061,685 |  |  | $ | 3.49 |  |  | 116,859 |  |  | 56,696,525 |  |  | $ | 2.06 |
(1) | Weighted average convertible limited partnership units of 2,224,100, 2,182,467, and 2,224,707, which include vested Series Z Incentive Units, Series Z-1 Incentive Units, 2014 Long-Term Incentive Plan Units, and 2015 Long-Term Incentive Plan Units, for the years ended December 31, 2016, 2015 and 2014, respectively, were not included in the determination of diluted earnings per share calculation because they were anti-dilutive. The related income allocated to these convertible limited partnership units aggregated $14.1 million, $7.8 million, and $4.9 million for the years ended December 31, 2016, 2015, and 2014, respectively. Additionally, excludes all DownREIT units as they are anti-dilutive.
Essex Portfolio, L.P. [Member] |
Net Income Per Share and Net Income Per Unit [Line Items] |
Net Income Per Common Share and Net Income Per Unit | Basic and diluted income per unit is calculated as follows for the years ended December 31 ($ in thousands, except unit and per unit amounts):
| 2016 |  | 2015 |  | 2014
| Income |  | Weighted- average Common Units |  | Per Common Unit Amount |  | Income |  | Weighted- average Common Units |  | Per Common Unit Amount |  | Income |  | Weighted- average Common Units |  | Per Common Unit Amount
Basic: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income available to common unitholders | $ | 425,213 |  |  | 67,695,640 |  |  | $ | 6.28 |  |  | $ | 234,689 |  |  | 67,054,184 |  |  | $ | 3.50 |  |  | $ | 121,726 |  |  | 58,771,666 |  |  | $ | 2.07 |
Effect of Dilutive Securities (1) | — |  |  | 116,276 |  |  |  |  |  | — |  |  | 189,968 |  |  |  |  |  | — |  |  | 149,566 |  |  |  |
Diluted: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income available to common unitholders | $ | 425,213 |  |  | 67,811,916 |  |  | $ | 6.27 |  |  | $ | 234,689 |  |  | 67,244,152 |  |  | $ | 3.49 |  |  | $ | 121,726 |  |  | 58,921,232 |  |  | $ | 2.07 |
(1) | Stock options of 252,334, 54,100, and 10,843, for the years ended December 31, 2016, 2015, and 2014, respectively, were not included in the diluted earnings per unit calculation because the assumed proceeds per share of these options plus the average unearned compensation were greater than the average market price of the common shares for the years ended and, therefore, were anti-dilutive. Additionally, excludes all DownREIT units as they are anti-dilutive.
The cumulative convertible Series H preferred interest have been excluded from diluted earnings per unit for the years ended December 31, 2016, 2015, and 2014 respectively, as the effect was anti-dilutive. The cumulative convertible Series G preferred interest have been excluded from diluted earnings per unit for the year ended December 31, 2014 as the effect was anti-dilutive.

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