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, 2017	$ 46,201	$ 2,678	$ 4,651,205	$ (1,871,603)	$ (2,681)	$ 9,564	$ 2,835,364
Consolidated Statements of Changes in Equity
Net income/(loss) attributable to UDR, Inc.				102,357			102,357
Net income/(loss) attributable to noncontrolling interests						86	86
Contribution of noncontrolling interests in consolidated real estate						108	108
Repurchase of common shares		(6)	(19,982)				(19,988)
Long Term Incentive Plan Unit grants/(vestings), net						1,498	1,498
Other comprehensive income/(loss)					1,274		1,274
Issuance/(forfeiture) of common and restricted shares, net			(4,731)				(4,731)
Adjustment for conversion of noncontrolling interest of unitholders in the Operating Partnership and DownREIT Partnership		5	12,655				12,660
Common stock distributions declared ($0.3425, $0.3225 per share for the three months ended June 30, 2019 and 2018 and $0.685, $0.6450 per share for the six months ended June 30, 2019 and 2018, respectively)				(172,654)			(172,654)
Preferred stock distributions declared-Series E ($0.3708, $0.3492 per share for the three months ended June 30, 2019 and 2018 and $0.7416, $0.6984 per share for the six months ended June 30, 2019 and 2018, respectively)				(1,926)			(1,926)
Adjustment to reflect redemption value of redeemable noncontrolling interests				14,702			14,702
Ending Balance at Jun. 30, 2018	46,201	2,677	4,639,147	(1,929,124)	(1,407)	11,256	2,768,750
Beginning Balance at Mar. 31, 2018	46,201	2,676	4,638,766	(1,808,907)	(1,276)	8,318	2,885,778
Consolidated Statements of Changes in Equity
Net income/(loss) attributable to UDR, Inc.				20,601			20,601
Net income/(loss) attributable to noncontrolling interests						16	16
Long Term Incentive Plan Unit grants/(vestings), net						2,922	2,922
Other comprehensive income/(loss)					(131)		(131)
Issuance/(forfeiture) of common and restricted shares, net			(583)				(583)
Adjustment for conversion of noncontrolling interest of unitholders in the Operating Partnership and DownREIT Partnership		1	964				965
Common stock distributions declared ($0.3425, $0.3225 per share for the three months ended June 30, 2019 and 2018 and $0.685, $0.6450 per share for the six months ended June 30, 2019 and 2018, respectively)				(86,332)			(86,332)
Preferred stock distributions declared-Series E ($0.3708, $0.3492 per share for the three months ended June 30, 2019 and 2018 and $0.7416, $0.6984 per share for the six months ended June 30, 2019 and 2018, respectively)				(971)			(971)
Adjustment to reflect redemption value of redeemable noncontrolling interests				(53,515)			(53,515)
Ending Balance at Jun. 30, 2018	46,201	2,677	4,639,147	(1,929,124)	(1,407)	11,256	2,768,750
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.				60,122			60,122
Net income/(loss) attributable to noncontrolling interests						57	57
Contribution of noncontrolling interests in consolidated real estate						125	125
Long Term Incentive Plan Unit grants/(vestings), net						1,277	1,277
Other comprehensive income/(loss)					(7,771)		(7,771)
Issuance/(forfeiture) of common and restricted shares, net			(298)				(298)
Issuance of common shares through public offering, net		49	212,823				212,872
Adjustment for conversion of noncontrolling interest of unitholders in the Operating Partnership and DownREIT Partnership		27	111,562				111,589
Common stock distributions declared ($0.3425, $0.3225 per share for the three months ended June 30, 2019 and 2018 and $0.685, $0.6450 per share for the six months ended June 30, 2019 and 2018, respectively)				(193,523)			(193,523)
Preferred stock distributions declared-Series E ($0.3708, $0.3492 per share for the three months ended June 30, 2019 and 2018 and $0.7416, $0.6984 per share for the six months ended June 30, 2019 and 2018, respectively)				(2,042)			(2,042)
Adjustment to reflect redemption value of redeemable noncontrolling interests				(137,170)			(137,170)
Ending Balance at Jun. 30, 2019	46,201	2,831	5,244,819	(2,336,609)	(7,838)	18,611	2,968,015
Beginning Balance at Mar. 31, 2019	46,201	2,818	5,184,195	(2,281,262)	(2,970)	13,382	2,962,364
Consolidated Statements of Changes in Equity
Net income/(loss) attributable to UDR, Inc.				35,619			35,619
Net income/(loss) attributable to noncontrolling interests						27	27
Long Term Incentive Plan Unit grants/(vestings), net						5,202	5,202
Other comprehensive income/(loss)					(4,868)		(4,868)
Issuance/(forfeiture) of common and restricted shares, net			1,201				1,201
Issuance of common shares through public offering, net		5	20,688				20,693
Adjustment for conversion of noncontrolling interest of unitholders in the Operating Partnership and DownREIT Partnership		8	38,735				38,743
Common stock distributions declared ($0.3425, $0.3225 per share for the three months ended June 30, 2019 and 2018 and $0.685, $0.6450 per share for the six months ended June 30, 2019 and 2018, respectively)				(96,962)			(96,962)
Preferred stock distributions declared-Series E ($0.3708, $0.3492 per share for the three months ended June 30, 2019 and 2018 and $0.7416, $0.6984 per share for the six months ended June 30, 2019 and 2018, respectively)				(1,031)			(1,031)
Adjustment to reflect redemption value of redeemable noncontrolling interests				7,027			7,027
Ending Balance at Jun. 30, 2019	$ 46,201	$ 2,831	$ 5,244,819	$ (2,336,609)	$ (7,838)	$ 18,611	$ 2,968,015