Earnings Per Share (Tables)

12 Months Ended

Dec. 31, 2016

Schedule of Calculation of Numerator and Denominator in Earnings Per Share [Table Text Block]

The following tables set forth the computation of net income per share – basic and net income per share – diluted for the Company (amounts in thousands except per share amounts):

	Year Ended December 31,
	2016			2015			2014
Numerator for net income per share – basic:
Income from continuing operations	$	4,479,586		$	907,621		$	657,101
Allocation to Noncontrolling Interests – Operating Partnership, net	(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		)
Premium on redemption of Preferred Shares	—			(3,486		)	—
Income from continuing operations available to Common Shares, net of   Noncontrolling Interests	4,288,574			862,895			625,641
Discontinued operations, net of Noncontrolling Interests	498			382			1,522
Numerator for net income per share – basic	$	4,289,072		$	863,277		$	627,163
Numerator for net income per share – diluted:
Income 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 distributions	(3,091		)	(3,357		)	(4,145		)
Premium on redemption of Preferred Shares	—			(3,486		)	—
Income from continuing operations available to Common Shares	4,460,065			897,121			650,412
Discontinued operations, net	518			397			1,582
Numerator for net income per share – diluted	$	4,460,583		$	897,518		$	651,994
Denominator for net income per share – basic and diluted:
Denominator for net income per share – basic	365,002			363,498			361,181
Effect of dilutive securities:
OP Units	13,827			13,576			13,718
Long-term compensation shares/units	3,163			3,546			2,836
Denominator for net income per share – diluted	381,992			380,620			377,735
Net income per share – basic	$	11.75		$	2.37		$	1.74
Net income per share – diluted	$	11.68		$	2.36		$	1.73
Net income per share – basic:
Income from continuing operations available to Common Shares, net of Noncontrolling Interests	$	11.75		$	2.37		$	1.73
Discontinued operations, net of Noncontrolling Interests	—			—			0.01
Net income per share – basic	$	11.75		$	2.37		$	1.74
Net income per share – diluted:
Income from continuing operations available to Common Shares	$	11.68		$	2.36		$	1.72
Discontinued operations, net	—			—			0.01
Net income per share – diluted	$	11.68		$	2.36		$	1.73

ERPOP [Member]

Schedule of Calculation of Numerator and Denominator in Earnings Per Share [Table Text Block]

The following tables set forth the computation of net income per Unit – basic and net income per Unit – diluted for the Operating Partnership (amounts in thousands except per Unit amounts):

	Year Ended December 31,
	2016			2015			2014
Numerator for net income per Unit – basic and diluted:
Income 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		)
Allocation to Preference Units	(3,091		)	(3,357		)	(4,145		)
Allocation to premium on redemption of Preference Units	—			(3,486		)	—
Income from continuing operations available to Units	4,460,065			897,121			650,412
Discontinued operations, net	518			397			1,582
Numerator for net income per Unit – basic and diluted	$	4,460,583		$	897,518		$	651,994
Denominator for net income per Unit – basic and diluted:
Denominator for net income per Unit – basic	378,829			377,074			374,899
Effect of dilutive securities:
Dilution for Units issuable upon assumed exercise/vesting of the Company's     long-term compensation shares/units	3,163			3,546			2,836
Denominator for net income per Unit – diluted	381,992			380,620			377,735
Net income per Unit – basic	$	11.75		$	2.37		$	1.74
Net income per Unit – diluted	$	11.68		$	2.36		$	1.73
Net income per Unit – basic:
Income from continuing operations available to Units	$	11.75		$	2.37		$	1.73
Discontinued operations, net	—			—			0.01
Net income per Unit – basic	$	11.75		$	2.37		$	1.74
Net income per Unit – diluted:
Income from continuing operations available to Units	$	11.68		$	2.36		$	1.72
Discontinued operations, net	—			—			0.01
Net income per Unit – diluted	$	11.68		$	2.36		$	1.73