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Quarterly Financial Data (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2018
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 |
2018 |  | 3/31 |  |  | 6/30 |  |  | 9/30 |  |  | 12/31 |
Total revenues |  | $ | 633,016 |  |  | $ | 639,808 |  |  | $ | 652,867 |  |  | $ | 652,743 |
Operating income |  |  | 196,869 |  |  |  | 217,654 |  |  |  | 224,731 |  |  |  | 219,306 |
Net income * |  |  | 220,548 |  |  |  | 118,410 |  |  |  | 223,846 |  |  |  | 122,388 |
Net income available to Common Shares |  |  | 211,036 |  |  |  | 112,830 |  |  |  | 214,164 |  |  |  | 116,415 |
Earnings per share – basic: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income available to Common Shares |  | $ | 0.57 |  |  | $ | 0.31 |  |  | $ | 0.58 |  |  | $ | 0.32 |
Weighted average Common Shares outstanding |  |  | 367,800 |  |  |  | 367,930 |  |  |  | 368,028 |  |  |  | 368,445 |
Earnings per share – diluted: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income available to Common Shares |  | $ | 0.57 |  |  | $ | 0.31 |  |  | $ | 0.58 |  |  | $ | 0.31 |
Weighted average Common Shares outstanding |  |  | 383,018 |  |  |  | 383,423 |  |  |  | 383,884 |  |  |  | 384,296 |
|  | 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 |
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 |
* The Company did not have any discontinued operations, extraordinary items or cumulative effect of change in accounting principle during the years ended December 31, 2018 and 2017. Therefore, income from continuing operations and income before extraordinary items and cumulative effect of change in accounting principle are not shown as they were both 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 |
2018 |  | 3/31 |  |  | 6/30 |  |  | 9/30 |  |  | 12/31 |
Total revenues |  | $ | 633,016 |  |  | $ | 639,808 |  |  | $ | 652,867 |  |  | $ | 652,743 |
Operating income |  |  | 196,869 |  |  |  | 217,654 |  |  |  | 224,731 |  |  |  | 219,306 |
Net income * |  |  | 220,548 |  |  |  | 118,410 |  |  |  | 223,846 |  |  |  | 122,388 |
Net income available to Units |  |  | 219,095 |  |  |  | 117,129 |  |  |  | 222,323 |  |  |  | 120,837 |
Earnings per Unit – basic: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income available to Units |  | $ | 0.57 |  |  | $ | 0.31 |  |  | $ | 0.58 |  |  | $ | 0.32 |
Weighted average Units outstanding |  |  | 380,663 |  |  |  | 380,795 |  |  |  | 380,912 |  |  |  | 381,306 |
Earnings per Unit – diluted: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income available to Units |  | $ | 0.57 |  |  | $ | 0.31 |  |  | $ | 0.58 |  |  | $ | 0.31 |
Weighted average Units outstanding |  |  | 383,018 |  |  |  | 383,423 |  |  |  | 383,884 |  |  |  | 384,296 |
|  | 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 |
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 |
* The Operating Partnership did not have any discontinued operations, extraordinary items or cumulative effect of change in accounting principle during the years ended December 31, 2018 and 2017. Therefore, income from continuing operations and income before extraordinary items and cumulative effect of change in accounting principle are not shown as they were both 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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109225645&loc=d3e1280-108306 + Details
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