Quarterly Financial Data (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2016

Schedule of Quarterly Financial Information [Table Text Block]

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
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

	First Quarter		Second Quarter		Third Quarter		Fourth Quarter
2015	3/31		6/30		9/30		12/31
Total revenues	$	666,371	$	679,112	$	696,289	$	703,193
Operating income	218,331		246,255		257,594		287,058
Income from continuing operations	190,069		298,504		205,375		213,673
Discontinued operations, net	155		114		81		47
Net income *	190,224		298,618		205,456		213,720
Net income available to Common Shares	178,842		285,587		195,859		202,989
Earnings per share – basic:
Net income available to Common Shares	$	0.49	$	0.79	$	0.54	$	0.56
Weighted average Common Shares outstanding	363,098		363,476		363,579		363,828
Earnings per share – diluted:
Net income available to Common Shares	$	0.49	$	0.78	$	0.53	$	0.55
Weighted average Common Shares outstanding	380,327		380,491		380,663		381,220

* The Company did not have any extraordinary items or cumulative effect of change in accounting principle during the years ended December 31, 2016 and 2015. 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]

Schedule of Quarterly Financial Information [Table Text Block]

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
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

	First Quarter		Second Quarter		Third Quarter		Fourth Quarter
2015	3/31		6/30		9/30		12/31
Total revenues	$	666,371	$	679,112	$	696,289	$	703,193
Operating income	218,331		246,255		257,594		287,058
Income from continuing operations	190,069		298,504		205,375		213,673
Discontinued operations, net	155		114		81		47
Net income *	190,224		298,618		205,456		213,720
Net income available to Units	185,901		296,941		203,637		211,039
Earnings per Unit – basic:
Net income available to Units	$	0.49	$	0.79	$	0.54	$	0.56
Weighted average Units outstanding	376,696		377,063		377,147		377,380
Earnings per Unit – diluted:
Net income available to Units	$	0.49	$	0.78	$	0.53	$	0.55
Weighted average Units outstanding	380,327		380,491		380,663		381,220

* The Operating Partnership did not have any extraordinary items or cumulative effect of change in accounting principle during the years ended December 31, 2016 and 2015. 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.