CONSOLIDATED BALANCE SHEETS (UNITED DOMINION REALTY, L.P.) (Parenthetical) - shares	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Partners’ capital:
Operating Partnership units outstanding related to limited partner	183,636,543	183,350,924	183,278,698	183,278,698
United Dominion Reality L.P.
Partners’ capital:
OP units outstanding related to general partner	110,883	110,883
Operating Partnership units outstanding related to limited partner	183,525,660	183,240,041