CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME OF ERP OPERATING LIMITED PARTNERSHIP (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Comprehensive income:
Net income	$ 223,846	$ 144,196	$ 562,804	$ 498,297
Other comprehensive income (loss) – derivative instruments:
Unrealized holding gains (losses) arising during the period	12,026	1,709	24,021	5,216
Losses reclassified into earnings from other comprehensive income	4,595	4,768	13,902	14,019
Other comprehensive income (loss)	16,621	6,477	37,923	19,235
Comprehensive income	240,467	150,673	600,727	517,532
Comprehensive (income) attributable to Noncontrolling Interests – Partially Owned Properties	(9,519)	(6,201)	(23,848)	(20,983)
Comprehensive income attributable to controlling interests	230,948	144,472	576,879	496,549
ERPOP [Member]
Comprehensive income:
Net income	223,846	144,196	562,804	498,297
Other comprehensive income (loss) – derivative instruments:
Unrealized holding gains (losses) arising during the period	12,026	1,709	24,021	5,216
Losses reclassified into earnings from other comprehensive income	4,595	4,768	13,902	14,019
Other comprehensive income (loss)	16,621	6,477	37,923	19,235
Comprehensive income	240,467	150,673	600,727	517,532
Comprehensive (income) attributable to Noncontrolling Interests – Partially Owned Properties	(750)	(801)	(1,939)	(2,354)
Comprehensive income attributable to controlling interests	$ 239,717	$ 149,872	$ 598,788	$ 515,178