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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME OF ERP OPERATING LIMITED PARTNERSHIP - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Comprehensive income:
Net income	$ 685,192	$ 628,381	$ 4,480,104
Other comprehensive income (loss) – derivative instruments:
Unrealized holding gains (losses) arising during the year	5,174	6,439	(3,915)
Losses reclassified into earnings from other comprehensive income	18,452	18,858	41,758
Other comprehensive income (loss) – foreign currency:
Currency translation adjustments arising during the year	0	0	264
Other comprehensive income (loss)	23,626	25,297	38,107
Comprehensive income	708,818	653,678	4,518,211
Comprehensive (income) attributable to Noncontrolling Interests – Partially Owned Properties	(28,526)	(25,845)	(189,411)
Comprehensive income attributable to controlling interests	680,292	627,833	4,328,800
ERPOP [Member]
Comprehensive income:
Net income	685,192	628,381	4,480,104
Other comprehensive income (loss) – derivative instruments:
Unrealized holding gains (losses) arising during the year	5,174	6,439	(3,915)
Losses reclassified into earnings from other comprehensive income	18,452	18,858	41,758
Other comprehensive income (loss) – foreign currency:
Currency translation adjustments arising during the year			264
Other comprehensive income (loss)	23,626	25,297	38,107
Comprehensive income	708,818	653,678	4,518,211
Comprehensive (income) attributable to Noncontrolling Interests – Partially Owned Properties	(2,718)	(2,323)	(16,430)
Comprehensive income attributable to controlling interests	$ 706,100	$ 651,355	$ 4,501,781

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