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Real Estate Investments Real Estate Investments - Acquisitions And Sales Of Real Estate (Details) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 USD ($) | Dec. 31, 2018 USD ($) community unit | Dec. 31, 2017 USD ($) community unit
Schedule of Equity Method Investments [Line Items] |  |  |
Number of units acquired | unit |  | 166 |
Purchase Price |  | $ 35,400 |
Investment in real estate | $ 13,366,101 | 13,366,101 |
Encumbrance | $ 1,806,626 | 1,806,626 |
Land and Land Improvements [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Purchase Price |  | 20,500 |
Building and Improvements [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Purchase Price |  | 47,800 |
Prepaid Expenses and Other Assets [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Purchase Price |  | 2,700 |
Marquis [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Limited partnership interest in partnership investments | 49.90% |  |
Cash payments to acquire membership interests | $ 4,700 |  |
Consideration transferred, equity instruments | 7,900 |  |
Investment in real estate | 71,000 | 71,000 |
Encumbrance | $ 45,800 | $ 45,800 |
Apartment Building [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Number of communities acquired | community |  | 1 | 2
Number of units acquired | unit |  | 166 | 1,328
Purchase Price |  | $ 35,400 | $ 273,000
Apartment Building [Member] | Marquis [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Number of units acquired | unit |  | 166 |
Purchase Price |  | $ 35,400 |
Essex Ownership Percentage | 100.00% | 100.00% |

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- Definition Amount of lien or mortgage outstanding on real estate investment properties for entities with a substantial portion of business acquiring and holding investment real estate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Paragraph Column B -Subsection 28 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 970 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-28(Column B)) -URI http://asc.fasb.org/extlink&oid=6590653&loc=d3e638233-123024 + Details
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- Definition Amount, before accumulated depreciation, of real estate investment by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate. Excludes real estate not held as investment or interest. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 970 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-28(Column E)) -URI http://asc.fasb.org/extlink&oid=6590653&loc=d3e638233-123024 + Details
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