CONSOLIDATED STATEMENTS OF OPERATIONS OF ERP OPERATING LIMITED PARTNERSHIP (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
REVENUES
Rental income	$ 669,374	$ 639,620	$ 1,331,676	$ 1,272,451
Fee and asset management	$ 143	$ 188	$ 335	$ 373
Type of Revenue [Extensible List]	us-gaap:ManagementServiceMember	us-gaap:ManagementServiceMember	us-gaap:ManagementServiceMember	us-gaap:ManagementServiceMember
Total revenues	$ 669,517	$ 639,808	$ 1,332,011	$ 1,272,824
EXPENSES
Property and maintenance	108,461	103,744	223,531	211,946
Real estate taxes and insurance	91,446	89,482	182,888	181,396
Property management	24,369	23,484	50,765	46,928
General and administrative	14,329	12,502	29,710	28,780
Depreciation	200,508	192,942	404,723	389,251
Total expenses	439,113	422,154	891,617	858,301
Net gain (loss) on sales of real estate properties	138,856	(51)	138,835	142,162
Operating income	369,260	217,603	579,229	556,685
Interest and other income	1,009	1,116	1,590	6,996
Other expenses	(5,117)	(3,769)	(8,392)	(7,210)
Interest:
Expense incurred, net	(108,902)	(94,131)	(203,840)	(210,235)
Amortization of deferred financing costs	(3,647)	(2,099)	(5,783)	(5,778)
Income before income and other taxes, income (loss) from investments in unconsolidated entities and net gain (loss) on sales of land parcels	252,603	118,720	362,804	340,458
Income and other tax (expense) benefit	(246)	(274)	(484)	(487)
Income (loss) from investments in unconsolidated entities	68,765	(1,031)	68,058	(2,008)
Net gain (loss) on sales of land parcels	177	995	178	995
Net income	321,299	118,410	430,556	338,958
Partially Owned Properties	(821)	(509)	(1,620)	(1,189)
Net income attributable to controlling interests	$ 308,968	$ 113,602	$ 413,507	$ 325,411
Earnings per Unit – basic:
Net income available to Units	$ 0.83	$ 0.31	$ 1.11	$ 0.88
Earnings per Unit – diluted:
Net income available to Units	$ 0.83	$ 0.31	$ 1.11	$ 0.88
Weighted average Units outstanding	386,107	383,423	385,644	383,224
ERPOP [Member]
REVENUES
Rental income	$ 669,374	$ 639,620	$ 1,331,676	$ 1,272,451
Fee and asset management	$ 143	$ 188	$ 335	$ 373
Type of Revenue [Extensible List]	us-gaap:ManagementServiceMember	us-gaap:ManagementServiceMember	us-gaap:ManagementServiceMember	us-gaap:ManagementServiceMember
Total revenues	$ 669,517	$ 639,808	$ 1,332,011	$ 1,272,824
EXPENSES
Property and maintenance	108,461	103,744	223,531	211,946
Real estate taxes and insurance	91,446	89,482	182,888	181,396
Property management	24,369	23,484	50,765	46,928
General and administrative	14,329	12,502	29,710	28,780
Depreciation	200,508	192,942	404,723	389,251
Total expenses	439,113	422,154	891,617	858,301
Net gain (loss) on sales of real estate properties	138,856	(51)	138,835	142,162
Operating income	369,260	217,603	579,229	556,685
Interest and other income	1,009	1,116	1,590	6,996
Other expenses	(5,117)	(3,769)	(8,392)	(7,210)
Interest:
Expense incurred, net	(108,902)	(94,131)	(203,840)	(210,235)
Amortization of deferred financing costs	(3,647)	(2,099)	(5,783)	(5,778)
Income before income and other taxes, income (loss) from investments in unconsolidated entities and net gain (loss) on sales of land parcels	252,603	118,720	362,804	340,458
Income and other tax (expense) benefit	(246)	(274)	(484)	(487)
Income (loss) from investments in unconsolidated entities	68,765	(1,031)	68,058	(2,008)
Net gain (loss) on sales of land parcels	177	995	178	995
Net income	321,299	118,410	430,556	338,958
Partially Owned Properties	(821)	(509)	(1,620)	(1,189)
Net income attributable to controlling interests	320,478	117,901	428,936	337,769
ALLOCATION OF NET INCOME:
Preference Units	772	772	1,545	1,545
General Partner	308,196	112,830	411,962	323,866
Limited Partners	11,510	4,299	15,429	12,358
Net income available to Units	$ 319,706	$ 117,129	$ 427,391	$ 336,224
Earnings per Unit – basic:
Net income available to Units	$ 0.83	$ 0.31	$ 1.11	$ 0.88
Weighted average Units outstanding	383,227	380,795	382,854	380,729
Earnings per Unit – diluted:
Net income available to Units	$ 0.83	$ 0.31	$ 1.11	$ 0.88
Weighted average Units outstanding	386,107	383,423	385,644	383,224