Quarterly Financial Data (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2017

Quarterly Financial Data [Line Items]

Schedule of Quarterly Financial Information

The following unaudited quarterly data has been prepared on the basis of a December 31 year-end.  Amounts are in thousands, except for per share amounts.

	First Quarter		Second Quarter		Third Quarter		Fourth Quarter
2017	3/31		6/30		9/30		12/31
Total revenues	$	604,100	$	612,480	$	624,122	$	630,704
Operating income		204,371		210,550		217,786		214,764
Income from continuing operations		149,941		204,160		144,196		130,084
Net income *		149,941		204,160		144,196		130,084
Net income available to Common Shares		142,969		195,268		137,457		124,669
Earnings per share – basic:
Net income available to Common Shares	$	0.39	$	0.53	$	0.37	$	0.34
Weighted average Common Shares outstanding		366,605		366,820		366,996		367,442
Earnings per share – diluted:
Net income available to Common Shares	$	0.39	$	0.53	$	0.37	$	0.34
Weighted average Common Shares outstanding		382,280		382,692		382,945		383,105

	First Quarter			Second Quarter			Third Quarter			Fourth Quarter
2016	3/31			6/30			9/30			12/31
Total revenues	$	619,083			$	595,154		$	606,074		$	605,489
Operating income		216,625				206,018			209,373			224,070
Income from continuing operations		3,731,988				228,365			217,246			301,987
Discontinued operations, net		(157	)			35			246			394
Net income *		3,731,831				228,400			217,492			302,381
Net income available to Common Shares		3,586,985				218,067			207,543			276,477
Earnings per share – basic:
Net income available to Common Shares	$	9.84			$	0.60		$	0.57		$	0.76
Weighted average Common Shares outstanding		364,592				365,047			365,109			365,256
Earnings per share – diluted:
Net income available to Common Shares	$	9.76			$	0.59		$	0.56		$	0.75
Weighted average Common Shares outstanding		382,243				382,065			382,373			381,860

* The Company did not have any extraordinary items or cumulative effect of change in accounting principle during the years ended December 31, 2017 and 2016.  Therefore, income before extraordinary items and cumulative effect of change in accounting principle is not shown as it was equal to the net income amounts disclosed above.

ERPOP [Member]

Quarterly Financial Data [Line Items]

Schedule of Quarterly Financial Information

The following unaudited quarterly data has been prepared on the basis of a December 31 year-end.  Amounts are in thousands, except for per Unit amounts.

	First Quarter		Second Quarter		Third Quarter		Fourth Quarter
2017	3/31		6/30		9/30		12/31
Total revenues	$	604,100	$	612,480	$	624,122	$	630,704
Operating income		204,371		210,550		217,786		214,764
Income from continuing operations		149,941		204,160		144,196		130,084
Net income *		149,941		204,160		144,196		130,084
Net income available to Units		148,380		202,622		142,623		129,342
Earnings per Unit – basic:
Net income available to Units	$	0.39	$	0.53	$	0.37	$	0.34
Weighted average Units outstanding		379,504		379,733		379,906		380,325
Earnings per Unit – diluted:
Net income available to Units	$	0.39	$	0.53	$	0.37	$	0.34
Weighted average Units outstanding		382,280		382,692		382,945		383,105

	First Quarter			Second Quarter			Third Quarter			Fourth Quarter
2016	3/31			6/30			9/30			12/31
Total revenues	$	619,083			$	595,154		$	606,074		$	605,489
Operating income		216,625				206,018			209,373			224,070
Income from continuing operations		3,731,988				228,365			217,246			301,987
Discontinued operations, net		(157	)			35			246			394
Net income *		3,731,831				228,400			217,492			302,381
Net income available to Units		3,730,294				226,847			215,896			287,546
Earnings per Unit – basic:
Net income available to Units	$	9.84			$	0.60		$	0.57		$	0.76
Weighted average Units outstanding		378,289				378,934			379,008			379,081
Earnings per Unit – diluted:
Net income available to Units	$	9.76			$	0.59		$	0.56		$	0.75
Weighted average Units outstanding		382,243				382,065			382,373			381,860

* The Operating Partnership did not have any extraordinary items or cumulative effect of change in accounting principle during the years ended December 31, 2017 and 2016.  Therefore, income before extraordinary items and cumulative effect of change in accounting principle is not shown as it was equal to the net income amounts disclosed above.