CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
REVENUES:
Rental income	$ 305,982	$ 278,463	$ 626,075	$ 546,385
Joint venture management and other fees	$ 1,274	$ 2,845	$ 2,662	$ 5,596
Type of revenue	udr:ManagementAndOtherFeesMember	udr:ManagementAndOtherFeesMember	udr:ManagementAndOtherFeesMember	udr:ManagementAndOtherFeesMember
Total revenues	$ 307,256	$ 281,308	$ 628,737	$ 551,981
OPERATING EXPENSES:
Property operating and maintenance	48,717	42,894	98,200	84,833
Real estate taxes and insurance	45,012	35,834	90,157	72,134
Property management	8,797	8,006	18,000	15,709
Other operating expenses	6,100	2,735	11,066	8,381
Real estate depreciation and amortization	155,056	117,934	310,532	230,402
General and administrative	10,971	12,338	25,949	24,805
Casualty-related charges/(recoveries), net	102	246	1,353	246
Other depreciation and amortization	2,027	1,678	4,052	3,334
Total operating expenses	276,782	221,665	559,309	439,844
Gain/(loss) on sale of real estate owned	61,303	5,282	61,303	5,282
Operating income	91,777	64,925	130,731	117,419
Income/(loss) from unconsolidated entities	8,021	6,625	11,388	6,674
Interest expense	(38,597)	(34,417)	(77,914)	(67,959)
Interest income and other income/(expense), net	2,421	1,310	5,121	11,123
Income/(loss) before income taxes	63,622	38,443	69,326	67,257
Tax (provision)/benefit, net	(1,526)	(125)	(1,690)	(2,337)
Net income/(loss)	62,096	38,318	67,636	64,920
Net (income)/loss attributable to redeemable noncontrolling interests in the Operating Partnership and DownREIT Partnership	(4,291)	(2,652)	(4,604)	(4,709)
Net (income)/loss attributable to noncontrolling interests	(34)	(47)	(40)	(89)
Net income/(loss) attributable to UDR, Inc.	57,771	35,619	62,992	60,122
Distributions to preferred stockholders - Series E (Convertible)	(1,062)	(1,031)	(2,128)	(2,042)
Net income/(loss) attributable to common stockholders	$ 56,709	$ 34,588	$ 60,864	$ 58,080
Income/(loss) per weighted average common share - basic	$ 0.19	$ 0.12	$ 0.21	$ 0.21
Income/(loss) per weighted average common share - diluted	$ 0.19	$ 0.12	$ 0.21	$ 0.21
Weighted average number of common shares outstanding - Basic	294,710	281,960	294,584	279,494
Weighted average number of common shares outstanding - diluted	295,087	282,575	295,083	280,081