CONSOLIDATED STATEMENTS OF OPERATIONS OF ERP OPERATING LIMITED PARTNERSHIP (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
REVENUES
Rental income	$ 685,120	$ 652,677	$ 2,016,796	$ 1,925,128
Fee and asset management	$ 25	$ 190	$ 360	$ 563
Type of Revenue [Extensible List]	us-gaap:ManagementServiceMember	us-gaap:ManagementServiceMember	us-gaap:ManagementServiceMember	us-gaap:ManagementServiceMember
Total revenues	$ 685,145	$ 652,867	$ 2,017,156	$ 1,925,691
EXPENSES
Property and maintenance	114,966	110,541	338,497	322,487
Real estate taxes and insurance	87,546	87,388	270,434	268,784
Property management	21,940	22,247	72,705	69,175
General and administrative	11,417	12,640	41,127	41,420
Depreciation	211,478	194,618	616,201	583,869
Total expenses	447,347	427,434	1,338,964	1,285,735
Net gain (loss) on sales of real estate properties	130,565	114,672	269,400	256,834
Impairment		(702)		(702)
Operating income	368,363	339,403	947,592	896,088
Interest and other income	631	7,864	2,221	14,860
Other expenses	(2,813)	(7,661)	(11,205)	(14,871)
Interest:
Expense incurred, net	(85,936)	(111,219)	(289,776)	(321,454)
Amortization of deferred financing costs	(2,881)	(3,276)	(8,664)	(9,054)
Income before income and other taxes, income (loss) from investments in unconsolidated entities and net gain (loss) on sales of land parcels	277,364	225,111	640,168	565,569
Income and other tax (expense) benefit	(265)	(280)	(749)	(767)
Income (loss) from investments in unconsolidated entities	(1,152)	(985)	66,906	(2,993)
Net gain (loss) on sales of land parcels	1,899		2,077	995
Net income	277,846	223,846	708,402	562,804
Partially Owned Properties	(830)	(750)	(2,450)	(1,939)
Net income attributable to controlling interests	$ 267,106	$ 214,937	$ 680,613	$ 540,348
Earnings per Unit – basic:
Net income available to Units	$ 0.72	$ 0.58	$ 1.83	$ 1.46
Earnings per Unit – diluted:
Net income available to Units	$ 0.71	$ 0.58	$ 1.82	$ 1.46
Weighted average Units outstanding	386,896	383,884	386,177	383,433
ERPOP [Member]
REVENUES
Rental income	$ 685,120	$ 652,677	$ 2,016,796	$ 1,925,128
Fee and asset management	$ 25	$ 190	$ 360	$ 563
Type of Revenue [Extensible List]	us-gaap:ManagementServiceMember	us-gaap:ManagementServiceMember	us-gaap:ManagementServiceMember	us-gaap:ManagementServiceMember
Total revenues	$ 685,145	$ 652,867	$ 2,017,156	$ 1,925,691
EXPENSES
Property and maintenance	114,966	110,541	338,497	322,487
Real estate taxes and insurance	87,546	87,388	270,434	268,784
Property management	21,940	22,247	72,705	69,175
General and administrative	11,417	12,640	41,127	41,420
Depreciation	211,478	194,618	616,201	583,869
Total expenses	447,347	427,434	1,338,964	1,285,735
Net gain (loss) on sales of real estate properties	130,565	114,672	269,400	256,834
Impairment		(702)		(702)
Operating income	368,363	339,403	947,592	896,088
Interest and other income	631	7,864	2,221	14,860
Other expenses	(2,813)	(7,661)	(11,205)	(14,871)
Interest:
Expense incurred, net	(85,936)	(111,219)	(289,776)	(321,454)
Amortization of deferred financing costs	(2,881)	(3,276)	(8,664)	(9,054)
Income before income and other taxes, income (loss) from investments in unconsolidated entities and net gain (loss) on sales of land parcels	277,364	225,111	640,168	565,569
Income and other tax (expense) benefit	(265)	(280)	(749)	(767)
Income (loss) from investments in unconsolidated entities	(1,152)	(985)	66,906	(2,993)
Net gain (loss) on sales of land parcels	1,899		2,077	995
Net income	277,846	223,846	708,402	562,804
Partially Owned Properties	(830)	(750)	(2,450)	(1,939)
Net income attributable to controlling interests	277,016	223,096	705,952	560,865
ALLOCATION OF NET INCOME:
Preference Units	773	773	2,318	2,318
General Partner	266,333	214,164	678,295	538,030
Limited Partners	9,910	8,159	25,339	20,517
Net income available to Units	$ 276,243	$ 222,323	$ 703,634	$ 558,547
Earnings per Unit – basic:
Net income available to Units	$ 0.72	$ 0.58	$ 1.83	$ 1.46
Weighted average Units outstanding	383,709	380,912	383,142	380,791
Earnings per Unit – diluted:
Net income available to Units	$ 0.71	$ 0.58	$ 1.82	$ 1.46
Weighted average Units outstanding	386,896	383,884	386,177	383,433