CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME OF ERP OPERATING LIMITED PARTNERSHIP (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Comprehensive income
Net income	$ 204,160	$ 228,400	$ 354,101	$ 3,960,231
Other comprehensive income (loss) – derivative instruments:
Unrealized holding gains (losses) arising during the period	3,507	(1,561)	3,507	(4,467)
Losses reclassified into earnings from other comprehensive income	4,668	4,268	9,251	32,922
Other comprehensive income (loss) – foreign currency:
Currency translation adjustments arising during the period		(25)		50
Other comprehensive income	8,175	2,682	12,758	28,505
Comprehensive income	212,335	231,082	366,859	3,988,736
Comprehensive (income) attributable to Noncontrolling Interests – Partially Owned Properties	(8,416)	(9,664)	(14,782)	(154,734)
Comprehensive income attributable to controlling interests	203,919	221,418	352,077	3,834,002
ERPOP [Member]
Comprehensive income
Net income	204,160	228,400	354,101	3,960,231
Other comprehensive income (loss) – derivative instruments:
Unrealized holding gains (losses) arising during the period	3,507	(1,561)	3,507	(4,467)
Losses reclassified into earnings from other comprehensive income	4,668	4,268	9,251	32,922
Other comprehensive income (loss) – foreign currency:
Currency translation adjustments arising during the period		(25)		50
Other comprehensive income	8,175	2,682	12,758	28,505
Comprehensive income	212,335	231,082	366,859	3,988,736
Comprehensive (income) attributable to Noncontrolling Interests – Partially Owned Properties	(765)	(781)	(1,553)	(1,545)
Comprehensive income attributable to controlling interests	$ 211,570	$ 230,301	$ 365,306	$ 3,987,191