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Quarterly Financial Data (Unaudited) (Tables) | 12 Months Ended
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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.

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- Definition Tabular disclosure of quarterly financial data. Includes, but is not limited to, financial information for fiscal quarters, cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a)-(j) -URI http://asc.fasb.org/extlink&oid=68076893&loc=d3e1280-108306 + Details
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