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REAL ESTATE OWNED (UNITED DOMINION REALTY, L.P.) - Acquisitions and Dispositions (Details) $ in Millions | 3 Months Ended
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Mar. 31, 2020 USD ($) item community state | Mar. 31, 2019 USD ($)
Real Estate Owned Disclosure |  |
Number of communities owned (in communities) | community | 150 |
Number of states in which there are owned and consolidated communities | state | 13 |
Development costs excluding direct costs and capitalized interest | $ 6.9 | $ 3.3
Number of apartments owned (in apartments homes) | item | 47,579 |
Interest capitalized during period | $ 1.4 | 1.1
United Dominion Realty L.P. |  |
Real Estate Owned Disclosure |  |
Number of communities owned (in communities) | community | 52 |
Number of states in which there are owned and consolidated communities | state | 9 |
Development costs excluding direct costs and capitalized interest | $ 0.4 |
Number of apartments owned (in apartments homes) | item | 16,434 |
United Dominion Realty L.P. | Maximum |  |
Real Estate Owned Disclosure |  |
Development costs excluding direct costs and capitalized interest |  | 0.1
Interest capitalized during period | $ 0.1 | $ 0.1

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- Definition Amount of interest capitalized, including amount of allowance for funds used during construction. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 835 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6501662&loc=d3e56162-110433 + Details
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- Definition The number of states the entity operates in as of the balance sheet date. + References No definition available. + Details
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