CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
REVENUES:
Rental income	$ 1,035,105	$ 984,309	$ 948,461
Joint venture management and other fees	$ 11,754	$ 11,482	$ 11,400
Type of revenue	udr:ManagementAndOtherFeesMember	udr:ManagementAndOtherFeesMember	udr:ManagementAndOtherFeesMember
Total revenues	$ 1,046,859	$ 995,791	$ 959,861
OPERATING EXPENSES:
Property operating and maintenance	169,078	164,660	159,947
Real estate taxes and insurance	133,912	121,146	115,429
Property management	28,465	27,068	26,083
Other operating expenses	12,100	9,060	7,649
Real estate depreciation and amortization	429,006	430,054	419,615
General and administrative	46,983	48,566	49,761
Casualty-related charges/(recoveries), net	2,121	4,335	732
Other depreciation and amortization	6,673	6,408	6,023
Total operating expenses	828,338	811,297	785,239
Gain/(loss) on sale of real estate owned	136,197	43,404	226,199
Operating income	354,718	227,898	400,821
Income/(loss) from unconsolidated entities	(5,055)	31,257	52,234
Interest expense	(134,168)	(128,711)	(123,031)
Interest income and other income/(expense), net	6,735	1,971	1,930
Income/(loss) before income taxes	222,230	132,415	331,954
Tax (provision)/benefit, net	(688)	240	(11,574)
Net income/(loss)	221,542	132,655	320,380
Net (income)/loss attributable to redeemable noncontrolling interests in the Operating Partnership and DownREIT Partnership	(18,215)	(10,933)	(27,282)
Net (income)/loss attributable to noncontrolling interests	(221)	(164)	(380)
Net income/(loss) attributable to UDR, Inc.	203,106	121,558	292,718
Distributions to preferred stockholders — Series E (Convertible)	(3,868)	(3,708)	(3,717)
Net income/(loss) attributable to common stockholders	$ 199,238	$ 117,850	$ 289,001
Income/(loss) per weighted average common share - basic	$ 0.74	$ 0.44	$ 1.09
Income/(loss) per weighted average common share - diluted	$ 0.74	$ 0.44	$ 1.08
Weighted average number of common shares outstanding — Basic	268,179	267,024	265,386
Weighted average number of common shares outstanding — diluted	269,483	268,830	267,311