CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
REVENUES:
Rental income	$ 308,845	$ 289,008	$ 934,920	$ 835,393
Joint venture management and other fees	$ 1,199	$ 6,386	$ 3,861	$ 11,982
Type of revenue	udr:ManagementAndOtherFeesMember	udr:ManagementAndOtherFeesMember	udr:ManagementAndOtherFeesMember	udr:ManagementAndOtherFeesMember
Total revenues	$ 310,044	$ 295,394	$ 938,781	$ 847,375
OPERATING EXPENSES:
Property operating and maintenance	53,385	46,869	151,585	131,702
Real estate taxes and insurance	44,328	38,490	134,485	110,624
Property management	8,879	8,309	26,879	24,018
Other operating expenses	5,543	2,751	16,609	11,132
Real estate depreciation and amortization	151,949	127,391	462,481	357,793
General and administrative	11,958	12,197	37,907	37,002
Casualty-related charges/(recoveries), net		(1,088)	1,353	(842)
Other depreciation and amortization	3,887	1,619	7,939	4,953
Total operating expenses	279,929	236,538	839,238	676,382
Gain/(loss) on sale of real estate owned			61,303	5,282
Operating income	30,115	58,856	160,846	176,275
Income/(loss) from unconsolidated entities	2,940	12,713	14,328	19,387
Interest expense	(62,268)	(42,523)	(140,182)	(110,482)
Interest income and other income/(expense), net	2,183	1,875	7,304	12,998
Income/(loss) before income taxes	(27,030)	30,921	42,296	98,178
Tax (provision)/benefit, net	(187)	(1,499)	(1,877)	(3,836)
Net income/(loss)	(27,217)	29,422	40,419	94,342
Net (income)/loss attributable to redeemable noncontrolling interests in the Operating Partnership and DownREIT Partnership	1,990	(2,162)	(2,614)	(6,871)
Net (income)/loss attributable to noncontrolling interests	(31)	(56)	(71)	(145)
Net income/(loss) attributable to UDR, Inc.	(25,258)	27,204	37,734	87,326
Distributions to preferred stockholders - Series E (Convertible)	(1,051)	(1,031)	(3,179)	(3,073)
Net income/(loss) attributable to common stockholders	$ (26,309)	$ 26,173	$ 34,555	$ 84,253
Income/(loss) per weighted average common share - basic	$ (0.09)	$ 0.09	$ 0.12	$ 0.30
Income/(loss) per weighted average common share - diluted	$ (0.09)	$ 0.09	$ 0.12	$ 0.30
Weighted average number of common shares outstanding - Basic	294,713	288,706	294,627	282,598
Weighted average number of common shares outstanding - diluted	295,003	289,529	294,938	283,292