Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income (loss) from continuing operations	$ 4,479,586	$ 907,621	$ 657,101
Income (Loss) Attributable to Noncontrolling Interest	(171,491)	(34,226)	(24,771)
Net (income) attributable to Noncontrolling Interests – Partially Owned Properties	(16,430)	(3,657)	(2,544)
Preferred distributions	(3,091)	(3,357)	(4,145)
Preferred Stock Redemption Premium	0	(3,486)	0
Income from continuing operations available to Common Shares, net of Noncontrolling Interests	4,288,574	862,895	625,641
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent	498	382	1,522
Numerator for net income per share – basic	4,289,072	863,277	627,163
Income From Continuing Operations Available To Common Shares	4,460,065	897,121	650,412
Discontinued operations, net	518	397	1,582
Net Income (Loss) Available to Common Stockholders, Diluted	$ 4,460,583	$ 897,518	$ 651,994
Weighted average Common Shares outstanding	365,002	363,498	361,181
Dilutive Op Units	13,827	13,576	13,718
Dilutive Securities Options	3,163	3,546	2,836
Weighted average Common Shares outstanding	381,992	380,620	377,735
Earnings Per Share, Basic	$ 11.75	$ 2.37	$ 1.74
Earnings Per Share, Diluted	11.68	2.36	1.73
Income from continuing operations available to Common Shares	11.75	2.37	1.73
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share	0.00	0.00	0.01
Income from continuing operations available to Common Shares	11.68	2.36	1.72
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share	$ 0.00	$ 0.00	$ 0.01
ERPOP [Member]
Income (loss) from continuing operations	$ 4,479,586	$ 907,621	$ 657,101
Net (income) attributable to Noncontrolling Interests – Partially Owned Properties	(16,430)	(3,657)	(2,544)
Preferred Stock Redemption Premium	0	(3,486)	0
Discontinued operations, net	$ 518	$ 397	$ 1,582
Dilutive Securities Options	3,163	3,546	2,836
Weighted average Common Shares outstanding	381,992	380,620	377,735
Earnings Per Share, Basic	$ 11.75	$ 2.37	$ 1.74
Earnings Per Share, Diluted	11.68	2.36	1.73
Income from continuing operations available to Common Shares	11.75	2.37	1.73
Income from continuing operations available to Common Shares	$ 11.68	$ 2.36	$ 1.72
Allocation to Preference Units	$ (3,091)	$ (3,357)	$ (4,145)
Income Loss From Continuing Operations Available To Units	4,460,065	897,121	650,412
Numerator for net income per Unit – basic and diluted	$ 4,460,583	$ 897,518	$ 651,994
Weighted Average Limited Partnership and General Partnership Units Outstanding, Basic	378,829	377,074	374,899
Income (Loss) from Discontinued Operations, Net of Tax, Per Outstanding Limited Partnership and General Partnership Unit, Basic	$ 0.00	$ 0.00	$ 0.01
Income Loss From Discontinued Operations Net Of Tax Per Outstanding Limited Partnership And General Partnership net Diluted	$ 0.00	$ 0.00	$ 0.01