CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($) $ in Thousands	Preferred Stock	Common Stock	Paid-in Capital	Distributions in Excess of Net Income	Accumulated Other Comprehensive Income/(Loss), net	Noncontrolling Interests	Total
Beginning Balance at Dec. 31, 2018	$ 46,201	$ 2,755	$ 4,920,732	$ (2,063,996)	$ (67)	$ 17,152	$ 2,922,777
Consolidated Statements of Changes in Equity
Net income/(loss) attributable to UDR, Inc.				24,503			24,503
Net income/(loss) attributable to noncontrolling interests						30	30
Contribution of noncontrolling interests in consolidated real estate						125	125
Long Term Incentive Plan Unit grants/(vestings), net						(3,925)	(3,925)
Other comprehensive income/(loss)					(2,903)		(2,903)
Issuance/(forfeiture) of common and restricted shares, net			(1,499)				(1,499)
Issuance of common shares through public offering, net		44	192,135				192,179
Adjustment for conversion of noncontrolling interest of unitholders in the Operating Partnership and DownREIT Partnership		19	72,827				72,846
Common stock distributions declared				(96,561)			(96,561)
Preferred stock distributions declared-Series E				(1,011)			(1,011)
Adjustment to reflect redemption value of redeemable noncontrolling interests				(144,197)			(144,197)
Ending Balance at Mar. 31, 2019	46,201	2,818	5,184,195	(2,281,262)	(2,970)	13,382	2,962,364
Beginning Balance at Dec. 31, 2019	46,201	2,946	5,781,975	(2,462,132)	(10,448)	30,772	3,389,314
Consolidated Statements of Changes in Equity
Net income/(loss) attributable to UDR, Inc.				5,221			5,221
Net income/(loss) attributable to noncontrolling interests						(10)	(10)
Long Term Incentive Plan Unit grants/(vestings), net						(16,487)	(16,487)
Other comprehensive income/(loss)					(2,422)		(2,422)
Issuance/(forfeiture) of common and restricted shares, net		1	(1,332)				(1,331)
Adjustment for conversion of noncontrolling interest of unitholders in the Operating Partnership and DownREIT Partnership		2	7,828				7,830
Common stock distributions declared				(106,190)			(106,190)
Preferred stock distributions declared-Series E				(1,066)			(1,066)
Adjustment to reflect redemption value of redeemable noncontrolling interests				205,713			205,713
Ending Balance at Mar. 31, 2020	$ 46,201	$ 2,949	$ 5,788,471	(2,360,636)	$ (12,870)	$ 14,275	3,478,390
Consolidated Statements of Changes in Equity
Cumulative effect upon adoption of ASC 326				$ (2,182)			$ (2,182)