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SIGNIFICANT ACCOUNTING POLICIES (UNITED DOMINION REALTY, L.P.) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 01, 2019
Accounting policies |  |  |  |
Operating lease right-of-use assets | $ 204,225 |  |  |
Operating lease liabilities | 198,558 |  |  |
Development costs excluding direct costs and capitalized interest | 8,400 | $ 7,500 | $ 8,800 |
Interest capitalized during period | 5,100 | 10,600 | 18,600 |
Advertising expense | $ 6,500 | 6,700 | 6,200 |
Minimum percentage of carrying value of real estate portfolio | 10.00% |  |  |
Minimum | Buildings |  |  |  |
Accounting policies |  |  |  |
Estimated useful lives | 30 years |  |  |
Minimum | Building improvements |  |  |  |
Accounting policies |  |  |  |
Estimated useful lives | 10 years |  |  |
Minimum | Furniture, fixtures, equipment, and other assets |  |  |  |
Accounting policies |  |  |  |
Estimated useful lives | 3 years |  |  |
Maximum | Buildings |  |  |  |
Accounting policies |  |  |  |
Estimated useful lives | 55 years |  |  |
Maximum | Building improvements |  |  |  |
Accounting policies |  |  |  |
Estimated useful lives | 35 years |  |  |
Maximum | Furniture, fixtures, equipment, and other assets |  |  |  |
Accounting policies |  |  |  |
Estimated useful lives | 10 years |  |  |
United Dominion Realty L.P. |  |  |  |
Accounting policies |  |  |  |
Operating lease right-of-use assets | $ 205,668 |  |  |
Operating lease liabilities | 200,001 |  |  |
Development costs excluding direct costs and capitalized interest | 800 | 100 | 500 |
Interest capitalized during period | 200 |  |  |
Unrecognized Tax Benefits | 0 |  |  |
Advertising expense | $ 1,900 | 1,900 | 2,100 |
Minimum percentage of carrying value of real estate portfolio | 10.00% |  |  |
United Dominion Realty L.P. | Minimum | Buildings |  |  |  |
Accounting policies |  |  |  |
Estimated useful lives | 30 years |  |  |
United Dominion Realty L.P. | Minimum | Building improvements |  |  |  |
Accounting policies |  |  |  |
Estimated useful lives | 10 years |  |  |
United Dominion Realty L.P. | Minimum | Furniture, fixtures, equipment, and other assets |  |  |  |
Accounting policies |  |  |  |
Estimated useful lives | 3 years |  |  |
United Dominion Realty L.P. | Maximum |  |  |  |
Accounting policies |  |  |  |
Interest capitalized during period |  | 100 | $ 100 |
United Dominion Realty L.P. | Maximum | Buildings |  |  |  |
Accounting policies |  |  |  |
Estimated useful lives | 55 years |  |  |
United Dominion Realty L.P. | Maximum | Building improvements |  |  |  |
Accounting policies |  |  |  |
Estimated useful lives | 35 years |  |  |
United Dominion Realty L.P. | Maximum | Furniture, fixtures, equipment, and other assets |  |  |  |
Accounting policies |  |  |  |
Estimated useful lives | 10 years |  |  |
ASU 2016-02 | Adjustment |  |  |  |
Accounting policies |  |  |  |
Operating lease right-of-use assets |  |  |  | $ 94,300
Operating lease liabilities |  |  |  | 88,300
Prepaid rent and intangible assets |  |  |  | 6,000
ASU 2016-02 | Adjustment | United Dominion Realty L.P. |  |  |  |
Accounting policies |  |  |  |
Operating lease right-of-use assets |  |  |  | 94,200
Operating lease liabilities |  |  |  | $ 88,200
Prepaid rent and intangible assets |  | $ 6,000 |  |

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