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Net Income Per Common Share and Net Income Per Common Unit (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Basic: |  |  |  |
Net income available to common stockholders/unitholders | $ 99,335 | $ 80,975 | $ 310,468 | $ 272,333
Weighted average number of shares/common units outstanding during the period (in shares) | 65,850,524 | 66,052,108 | 65,757,914 | 66,047,990
Net income available to common stockholders/unitholders (in dollars per share) | $ 1.51 | $ 1.23 | $ 4.72 | $ 4.12
Effect of Dilutive Securities: Stock options (in shares) | 122,561 | 51,704 | 99,746 | 45,014
Diluted: |  |  |  |
Net income available to common stockholders/unitholders | $ 99,335 | $ 80,975 | $ 310,468 | $ 272,333
Net income available to common stockholders/unitholders, weighted average common shares (in shares) | 65,973,085 | 66,103,812 | 65,857,660 | 66,093,004
Net income available to common stockholders/unitholders (in dollars per share) | $ 1.51 | $ 1.22 | $ 4.71 | $ 4.12
Essex Portfolio, L.P. [Member] |  |  |  |
Basic: |  |  |  |
Net income available to common stockholders/unitholders | $ 102,799 | $ 83,764 | $ 321,331 | $ 281,714
Weighted average number of shares/common units outstanding during the period (in shares) | 68,148,913 | 68,325,091 | 68,058,802 | 68,321,153
Net income available to common stockholders/unitholders (in dollars per share) | $ 1.51 | $ 1.23 | $ 4.72 | $ 4.12
Effect of Dilutive Securities: Stock options (in shares) | 122,561 | 51,704 | 99,746 | 45,014
Diluted: |  |  |  |
Net income available to common stockholders/unitholders | $ 102,799 | $ 83,764 | $ 321,331 | $ 281,714
Net income available to common stockholders/unitholders, weighted average common shares (in shares) | 68,271,474 | 68,376,795 | 68,158,548 | 68,366,167
Net income available to common stockholders/unitholders (in dollars per share) | $ 1.51 | $ 1.23 | $ 4.71 | $ 4.12
Convertible Limited Partnership Units [Member] |  |  |  |
Diluted: |  |  |  |
Antidilutive securities excluded from computation of earnings per share, amount (in shares) | 2,298,389 | 2,272,983 | 2,300,888 | 2,273,163
Income allocated to convertible OP Units | $ 3,500 | $ 2,800 | $ 10,900 | $ 9,400
Share-based Payment Arrangement, Option [Member] |  |  |  |
Diluted: |  |  |  |
Antidilutive securities excluded from computation of earnings per share, amount (in shares) | 0 | 150,852 | 0 | 160,252
Share-based Payment Arrangement, Option [Member] | Essex Portfolio, L.P. [Member] |  |  |  |
Diluted: |  |  |  |
Antidilutive securities excluded from computation of earnings per share, amount (in shares) | 0 | 150,852 | 0 | 160,252

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