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LEASES (UNITED DOMINION REALTY, L.P.) - Lessee Future Minimum Payments - (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 USD ($) lease community | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2019
Lessee operating leases |  |  |  |
Number of communities subject to ground leases | community | 6 |  |  |
Operating leases existence of option to extend | true |  |  |
Lease classification per practical expedient | true |  |  |
Operating lease right-of-use assets | $ 204,225 |  |  |
Increase in operating lease right-to-use assets | $ 111,055 |  |  |
Number of ground leases that became fixed | lease | 2 |  |  |
Weighted average remaining lease term |  |  |  | 44 years 8 months 12 days
Weighted average discount rate | 5.00% |  |  |
Number of real estate properties | community | 148 |  |  |
Future minimum lease payments |  |  |  |
Operating lease liabilities | $ 198,558 |  |  |
LAND |  |  |  |
Future minimum lease payments |  |  |  |
2020 | 12,442 |  |  |
2021 | 12,442 |  |  |
2022 | 12,442 |  |  |
2023 | 12,442 |  |  |
2024 | 12,442 |  |  |
Thereafter | 455,221 |  |  |
Total future minimum lease payments (undiscounted) | 517,431 |  |  |
Difference between future undiscounted cash flows and discounted cash flows | (318,873) |  |  |
Operating lease liabilities | $ 198,558 |  |  |
United Dominion Realty L.P. |  |  |  |
Lessee operating leases |  |  |  |
Number of communities subject to ground leases | community | 6 |  |  |
Operating leases existence of option to extend | true |  |  |
Operating lease right-of-use assets | $ 205,668 |  |  |
Increase in operating lease right-to-use assets | $ 112,498 |  |  |
Weighted average remaining lease term | 44 years 4 months 24 days |  |  |
Weighted average discount rate | 5.00% |  |  |
Number of real estate properties | community | 52 |  |  |
Future minimum lease payments |  |  |  |
2020 | $ 12,594 |  |  |
2021 | 12,598 |  |  |
2022 | 12,601 |  |  |
2023 | 12,605 |  |  |
2024 | 12,608 |  |  |
Thereafter | 456,090 |  |  |
Total future minimum lease payments (undiscounted) | 519,096 |  |  |
Difference between future undiscounted cash flows and discounted cash flows | (319,095) |  |  |
Operating lease liabilities | 200,001 |  |  |
United Dominion Realty L.P. | LAND |  |  |  |
Lessee operating leases |  |  |  |
Increase in operating lease right-to-use assets | 111,100 |  |  |
2019 |  | $ 4,900 |  |
2020 |  | 4,900 |  |
2021 |  | 4,900 |  |
2022 |  | 4,900 |  |
2023 |  | 4,900 |  |
Thereafter |  | 313,900 |  |
Future minimum lease payments |  |  |  |
2020 | 12,442 |  |  |
2021 | 12,442 |  |  |
2022 | 12,442 |  |  |
2023 | 12,442 |  |  |
2024 | 12,442 |  |  |
Thereafter | 455,221 |  |  |
Total future minimum lease payments (undiscounted) | 517,431 |  |  |
Difference between future undiscounted cash flows and discounted cash flows | (318,873) |  |  |
Operating lease liabilities | $ 198,558 |  |  |
United Dominion Realty L.P. | LAND | Other operating expense |  |  |  |
Lessee operating leases |  |  |  |
Rent expense |  | $ 7,300 | $ 6,200 |
United Dominion Realty L.P. | Equipment Leases |  |  |  |
Lessee operating leases |  |  |  |
Number of leases | lease | 6 |  |  |
Increase in operating lease right-to-use assets | $ 1,400 |  |  |
Future minimum lease payments |  |  |  |
2020 | 152 |  |  |
2021 | 156 |  |  |
2022 | 159 |  |  |
2023 | 163 |  |  |
2024 | 166 |  |  |
Thereafter | 869 |  |  |
Total future minimum lease payments (undiscounted) | 1,665 |  |  |
Difference between future undiscounted cash flows and discounted cash flows | (222) |  |  |
Operating lease liabilities | $ 1,443 |  |  |
United Dominion Realty L.P. | Retail and Commercial Spaces |  |  |  |
Lessee operating leases |  |  |  |
Lease classification per practical expedient | true |  |  |

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