CONSOLIDATED STATEMENTS OF OPERATIONS OF ERP OPERATING LIMITED PARTNERSHIP - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
REVENUES
Rental income	$ 2,463,997	$ 2,571,705	$ 2,700,691
EXPENSES
Property and maintenance	453,532	440,998	446,845
Real estate taxes and insurance	397,105	381,562	366,139
Property management	98,155	93,825	95,344
General and administrative	56,506	48,305	52,757
Depreciation	838,272	820,832	831,083
Total expenses	1,843,570	1,785,522	1,792,168
Net gain (loss) on sales of real estate properties	1,072,183	531,807	447,637
Impairment	(16,769)
Operating income	1,675,841	1,317,990	1,356,160
Interest and other income	25,666	5,935	3,201
Other expenses	(19,275)	(17,510)	(18,177)
Interest:
Expense incurred, net	(272,473)	(365,073)	(390,076)
Amortization of deferred financing costs	(8,737)	(8,939)	(11,670)
Income before income and other taxes, income (loss) from investments in unconsolidated entities and net gain (loss) on sales of land parcels	1,401,022	932,403	939,438
Income and other tax (expense) benefit	(915)	(852)	2,281
Income (loss) from investments in unconsolidated entities	(3,398)	(3,284)	65,945
Net gain (loss) on sales of land parcels	5	34,234	2,044
Net income	1,396,714	962,501	1,009,708
Partially Owned Properties	(17,964)	(14,855)	(3,297)
Net income attributable to controlling interests	$ 1,332,850	$ 913,636	$ 970,377
Earnings per Unit – basic:
Net income available to Units	$ 3.56	$ 2.45	$ 2.61
Earnings per Unit – diluted:
Net income available to Units	$ 3.54	$ 2.45	$ 2.60
Weighted average Units outstanding	388,089	385,874	386,333
ERPOP [Member]
REVENUES
Rental income	$ 2,463,997	$ 2,571,705	$ 2,700,691
EXPENSES
Property and maintenance	453,532	440,998	446,845
Real estate taxes and insurance	397,105	381,562	366,139
Property management	98,155	93,825	95,344
General and administrative	56,506	48,305	52,757
Depreciation	838,272	820,832	831,083
Total expenses	1,843,570	1,785,522	1,792,168
Net gain (loss) on sales of real estate properties	1,072,183	531,807	447,637
Impairment	(16,769)
Operating income	1,675,841	1,317,990	1,356,160
Interest and other income	25,666	5,935	3,201
Other expenses	(19,275)	(17,510)	(18,177)
Interest:
Expense incurred, net	(272,473)	(365,073)	(390,076)
Amortization of deferred financing costs	(8,737)	(8,939)	(11,670)
Income before income and other taxes, income (loss) from investments in unconsolidated entities and net gain (loss) on sales of land parcels	1,401,022	932,403	939,438
Income and other tax (expense) benefit	(915)	(852)	2,281
Income (loss) from investments in unconsolidated entities	(3,398)	(3,284)	65,945
Net gain (loss) on sales of land parcels	5	34,234	2,044
Net income	1,396,714	962,501	1,009,708
Partially Owned Properties	(17,964)	(14,855)	(3,297)
Net income attributable to controlling interests	1,378,750	947,646	1,006,411
ALLOCATION OF NET INCOME:
Preference Units	3,090	3,090	3,090
General Partner	1,329,760	910,546	967,287
Limited Partners	45,900	34,010	36,034
Net income available to Units	$ 1,375,660	$ 944,556	$ 1,003,321
Earnings per Unit – basic:
Net income available to Units	$ 3.56	$ 2.45	$ 2.61
Weighted average Units outstanding	386,096	384,794	383,368
Earnings per Unit – diluted:
Net income available to Units	$ 3.54	$ 2.45	$ 2.60
Weighted average Units outstanding	388,089	385,874	386,333