CONSOLIDATED STATEMENTS OF OPERATIONS OF ERP OPERATING LIMITED PARTNERSHIP (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
REVENUES
Rental income	$ 682,305	$ 662,302
Fee and asset management	$ 24	$ 192
Type of Revenue [Extensible List]	us-gaap:ManagementServiceMember	us-gaap:ManagementServiceMember
Total revenues	$ 682,329	$ 662,494
EXPENSES
Property and maintenance	115,816	115,070
Real estate taxes and insurance	97,732	91,442
Property management	27,709	26,396
General and administrative	14,518	15,381
Depreciation	212,422	204,215
Total expenses	468,197	452,504
Net gain (loss) on sales of real estate properties	207,977	(21)
Operating income	422,109	209,969
Interest and other income	1,936	581
Other expenses	(2,533)	(3,275)
Interest:
Expense incurred, net	(85,590)	(94,938)
Amortization of deferred financing costs	(2,041)	(2,136)
Income before income and other taxes, income (loss) from investments in unconsolidated entities and net gain (loss) on sales of land parcels	333,881	110,201
Income and other tax (expense) benefit	(53)	(238)
Income (loss) from investments in unconsolidated entities	(1,157)	(707)
Net gain (loss) on sales of land parcels		1
Net income	332,671	109,257
Partially Owned Properties	(12,530)	(799)
Net income attributable to controlling interests	$ 308,606	$ 104,539
Earnings per Unit – basic:
Net income available to Units	$ 0.83	$ 0.28
Earnings per Unit – diluted:
Net income available to Units	$ 0.83	$ 0.28
Weighted average Units outstanding	386,949	385,184
ERPOP [Member]
REVENUES
Rental income	$ 682,305	$ 662,302
Fee and asset management	$ 24	$ 192
Type of Revenue [Extensible List]	us-gaap:ManagementServiceMember	us-gaap:ManagementServiceMember
Total revenues	$ 682,329	$ 662,494
EXPENSES
Property and maintenance	115,816	115,070
Real estate taxes and insurance	97,732	91,442
Property management	27,709	26,396
General and administrative	14,518	15,381
Depreciation	212,422	204,215
Total expenses	468,197	452,504
Net gain (loss) on sales of real estate properties	207,977	(21)
Operating income	422,109	209,969
Interest and other income	1,936	581
Other expenses	(2,533)	(3,275)
Interest:
Expense incurred, net	(85,590)	(94,938)
Amortization of deferred financing costs	(2,041)	(2,136)
Income before income and other taxes, income (loss) from investments in unconsolidated entities and net gain (loss) on sales of land parcels	333,881	110,201
Income and other tax (expense) benefit	(53)	(238)
Income (loss) from investments in unconsolidated entities	(1,157)	(707)
Net gain (loss) on sales of land parcels		1
Net income	332,671	109,257
Partially Owned Properties	(12,530)	(799)
Net income attributable to controlling interests	320,141	108,458
ALLOCATION OF NET INCOME:
Preference Units	773	773
General Partner	307,833	103,766
Limited Partners	11,535	3,919
Net income available to Units	$ 319,368	$ 107,685
Earnings per Unit – basic:
Net income available to Units	$ 0.83	$ 0.28
Weighted average Units outstanding	384,586	382,477
Earnings per Unit – diluted:
Net income available to Units	$ 0.83	$ 0.28
Weighted average Units outstanding	386,949	385,184