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Quarterly Financial Data (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2015
Schedule of Quarterly Financial Information [Table Text Block] |
|  | 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 |  | 218,171 |  |  | 246,184 |  |  | 257,501 |  |  | 286,964 |
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 |
|  | First Quarter |  | Second Quarter |  | Third Quarter |  | Fourth Quarter
2014 |  | 3/31 |  | 6/30 |  | 9/30 |  | 12/31
Total revenues |  | $ | 633,442 |  |  | $ | 652,568 |  |  | $ | 664,078 |  |  | $ | 664,660 |
Operating income |  | 199,259 |  |  | 228,310 |  |  | 243,274 |  |  | 250,532 |
Income from continuing operations |  | 81,680 |  |  | 117,210 |  |  | 231,252 |  |  | 226,959 |
Discontinued operations, net |  | 1,052 |  |  | 510 |  |  | (62 | ) |  | 82 |
Net income * |  | 82,732 |  |  | 117,720 |  |  | 231,190 |  |  | 227,041 |
Net income available to Common Shares |  | 78,099 |  |  | 111,654 |  |  | 220,707 |  |  | 216,703 |
Earnings per share – basic: |  |  |  |  |  |  |  |
Net income available to Common Shares |  | $ | 0.22 |  |  | $ | 0.31 |  |  | $ | 0.61 |  |  | $ | 0.60 |
Weighted average Common Shares outstanding |  | 360,470 |  |  | 360,809 |  |  | 361,409 |  |  | 362,018 |
Earnings per share – diluted: |  |  |  |  |  |  |  |
Net income available to Common Shares |  | $ | 0.22 |  |  | $ | 0.31 |  |  | $ | 0.61 |  |  | $ | 0.59 |
Weighted average Common Shares outstanding |  | 376,384 |  |  | 377,118 |  |  | 377,954 |  |  | 378,886 |
* The Company did not have any extraordinary items or cumulative effect of change in accounting principle during the years ended December 31, 2015 and 2014. 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] |
|  | 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 |  | 218,171 |  |  | 246,184 |  |  | 257,501 |  |  | 286,964 |
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 |
|  | First Quarter |  | Second Quarter |  | Third Quarter |  | Fourth Quarter
2014 |  | 3/31 |  | 6/30 |  | 9/30 |  | 12/31
Total revenues |  | $ | 633,442 |  |  | $ | 652,568 |  |  | $ | 664,078 |  |  | $ | 664,660 |
Operating income |  | 199,259 |  |  | 228,310 |  |  | 243,274 |  |  | 250,532 |
Income from continuing operations |  | 81,680 |  |  | 117,210 |  |  | 231,252 |  |  | 226,959 |
Discontinued operations, net |  | 1,052 |  |  | 510 |  |  | (62 | ) |  | 82 |
Net income * |  | 82,732 |  |  | 117,720 |  |  | 231,190 |  |  | 227,041 |
Net income available to Units |  | 81,192 |  |  | 116,096 |  |  | 229,445 |  |  | 225,261 |
Earnings per Unit – basic: |  |  |  |  |  |  |  |  |  |  |  |
Net income available to Units |  | $ | 0.22 |  |  | $ | 0.31 |  |  | $ | 0.61 |  |  | $ | 0.60 |
Weighted average Units outstanding |  | 374,201 |  |  | 374,551 |  |  | 375,116 |  |  | 375,711 |
Earnings per Unit – diluted: |  |  |  |  |  |  |  |  |  |  |  |
Net income available to Units |  | $ | 0.22 |  |  | $ | 0.31 |  |  | $ | 0.61 |  |  | $ | 0.59 |
Weighted average Units outstanding |  | 376,384 |  |  | 377,118 |  |  | 377,954 |  |  | 378,886 |
* The Operating Partnership did not have any extraordinary items or cumulative effect of change in accounting principle during the years ended December 31, 2015 and 2014. 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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