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Quarterly Results of Operations (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total property revenues | $ 350,787 | $ 348,610 | $ 346,526 | $ 344,947 | $ 342,417 | $ 341,974 | $ 336,766 | $ 333,168 |  |  |
Net income | 124,440 | 86,110 | 106,410 | 96,639 | 109,662 | 85,035 | 75,795 | 187,551 | $ 413,599 | $ 458,043 | $ 438,410
Net income available to common stockholders | $ 117,820 | $ 80,975 | $ 100,440 | $ 90,918 | $ 103,613 | $ 79,723 | $ 70,759 | $ 178,964 | $ 390,153 | $ 433,059 | $ 411,124
Net income: |  |  |  |  |  |  |  |  |  |  |
Net income available to common stockholders - basic (in dollars per share) | $ 1.78 | $ 1.23 | $ 1.52 | $ 1.38 | $ 1.57 | $ 1.21 | $ 1.08 | $ 2.73 | $ 5.91 | $ 6.58 | $ 6.28
Net income available to common stockholders - diluted (in dollars per share) | 1.78 | 1.22 | 1.52 | 1.38 | 1.57 | 1.21 | 1.08 | 2.72 | 5.90 | 6.57 | 6.27
Dividends declared (in dollars per share) | $ 1.86 | $ 1.86 | $ 1.86 | $ 1.86 | $ 1.75 | $ 1.75 | $ 1.75 | $ 1.75 | $ 7.44 | $ 7.00 | $ 6.40
Essex Portfolio, L.P. [Member] |  |  |  |  |  |  |  |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total property revenues | $ 350,787 | $ 348,610 | $ 346,526 | $ 344,947 | $ 342,417 | $ 341,974 | $ 336,766 | $ 333,168 |  |  |
Net income | 124,440 | 86,110 | 106,410 | 96,639 | 109,662 | 85,035 | 75,795 | 187,551 | $ 413,599 | $ 458,043 | $ 438,410
Net income available to common stockholders | $ 121,891 | $ 83,764 | $ 103,900 | $ 94,050 | $ 107,149 | $ 82,444 | $ 73,181 | $ 185,110 | $ 403,605 | $ 447,884 | $ 425,213
Net income: |  |  |  |  |  |  |  |  |  |  |
Net income available to common stockholders - basic (in dollars per share) | $ 1.78 | $ 1.23 | $ 1.52 | $ 1.38 | $ 1.57 | $ 1.21 | $ 1.08 | $ 2.73 | $ 5.91 | $ 6.58 | $ 6.28
Net income available to common stockholders - diluted (in dollars per share) | 1.78 | 1.23 | 1.52 | 1.38 | 1.57 | 1.21 | 1.08 | 2.72 | $ 5.90 | $ 6.57 | $ 6.27
Dividends declared (in dollars per share) | $ 1.86 | $ 1.86 | $ 1.86 | $ 1.86 | $ 1.75 | $ 1.75 | $ 1.75 | $ 1.75 |  |  |

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