CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME OF ERP OPERATING LIMITED PARTNERSHIP (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Comprehensive income:
Net income	$ 321,299	$ 118,410	$ 430,556	$ 338,958
Other comprehensive income (loss) – derivative instruments:
Unrealized holding gains (losses) arising during the period	(19,345)	5,908	(33,765)	11,995
Losses reclassified into earnings from other comprehensive income	4,509	4,516	8,902	9,307
Other comprehensive income (loss)	(14,836)	10,424	(24,863)	21,302
Comprehensive income	306,463	128,834	405,693	360,260
Comprehensive (income) attributable to Noncontrolling Interests – Partially Owned Properties	(11,797)	(5,190)	(16,150)	(14,329)
Comprehensive income attributable to controlling interests	294,666	123,644	389,543	345,931
ERPOP [Member]
Comprehensive income:
Net income	321,299	118,410	430,556	338,958
Other comprehensive income (loss) – derivative instruments:
Unrealized holding gains (losses) arising during the period	(19,345)	5,908	(33,765)	11,995
Losses reclassified into earnings from other comprehensive income	4,509	4,516	8,902	9,307
Other comprehensive income (loss)	(14,836)	10,424	(24,863)	21,302
Comprehensive income	306,463	128,834	405,693	360,260
Comprehensive (income) attributable to Noncontrolling Interests – Partially Owned Properties	(821)	(509)	(1,620)	(1,189)
Comprehensive income attributable to controlling interests	$ 305,642	$ 128,325	$ 404,073	$ 359,071