CONSOLIDATED STATEMENTS OF OPERATIONS (UNITED DOMINION REALTY, L.P.) - 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
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
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)
Net income/(loss)	221,542	132,655	320,380
United Dominion Reality L.P.
REVENUES:
Rental income	431,920	419,377	404,415
OPERATING EXPENSES:
Property operating and maintenance	67,400	67,493	65,562
Real estate taxes and insurance	47,140	45,043	41,732
Property management	11,878	11,533	11,122
Other operating expenses	8,864	6,833	6,059
Real estate depreciation and amortization	143,481	152,473	147,074
General and administrative	16,889	17,875	18,808
Casualty-related charges/(recoveries), net	951	1,922	484
Total operating expenses	296,603	303,172	290,841
Gain/(loss) on sale of real estate owned	75,507	41,272	33,180
Operating income	210,824	157,477	146,754
Income/(loss) from unconsolidated entities	43,496	(19,256)	(37,425)
Interest expense	(8,733)	(18,156)	(17,855)
Interest expense on notes payable due to the General Partner	(14,102)	(12,210)	(12,212)
Net income/(loss)	231,485	107,855	79,262
Net (income)/loss attributable to noncontrolling interests	(1,722)	(1,548)	(1,444)
Net income/(loss) attributable to OP unitholders	$ 229,763	$ 106,307	$ 77,818
Income/(loss) per OP unit- basic and diluted:
Net income/(loss) per weighted average OP Unit - basic and diluted	$ 1.25	$ 0.58	$ 0.42
Weighted average OP Units outstanding - basic and diluted	183,609	183,344	183,279