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Quarterly Financial Data (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2019
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 |
2019 (1) |  | 3/31 |  |  | 6/30 |  |  | 9/30 |  |  | 12/31 |
Total revenues |  | $ | 662,494 |  |  | $ | 669,517 |  |  | $ | 685,145 |  |  | $ | 683,919 |
Operating income |  |  | 209,969 |  |  |  | 369,260 |  |  |  | 368,363 |  |  |  | 408,952 |
Net income * |  |  | 109,257 |  |  |  | 321,299 |  |  |  | 277,846 |  |  |  | 301,306 |
Net income available to Common Shares |  |  | 103,766 |  |  |  | 308,196 |  |  |  | 266,333 |  |  |  | 288,992 |
Earnings per share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income available to Common Shares - basic |  | $ | 0.28 |  |  | $ | 0.83 |  |  | $ | 0.72 |  |  | $ | 0.78 |
Net income available to Common Shares - diluted |  | $ | 0.28 |  |  | $ | 0.83 |  |  | $ | 0.71 |  |  | $ | 0.77 |
|  | First Quarter |  |  | Second Quarter |  |  | Third Quarter |  |  | Fourth Quarter |
2018 (1) |  | 3/31 |  |  | 6/30 |  |  | 9/30 |  |  | 12/31 |
Total revenues |  | $ | 633,016 |  |  | $ | 639,808 |  |  | $ | 652,867 |  |  | $ | 652,743 |
Operating income |  |  | 339,082 |  |  |  | 217,603 |  |  |  | 339,403 |  |  |  | 219,282 |
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: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income available to Common Shares - basic |  | $ | 0.57 |  |  | $ | 0.31 |  |  | $ | 0.58 |  |  | $ | 0.32 |
Net income available to Common Shares - diluted |  | $ | 0.57 |  |  | $ | 0.31 |  |  | $ | 0.58 |  |  | $ | 0.31 |
* The Company did not have any discontinued operations, extraordinary items or cumulative effect of change in accounting principle during the periods presented. 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.
| (1) | Amounts may not equal full year results due to rounding.
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 |
2019 (1) |  | 3/31 |  |  | 6/30 |  |  | 9/30 |  |  | 12/31 |
Total revenues |  | $ | 662,494 |  |  | $ | 669,517 |  |  | $ | 685,145 |  |  | $ | 683,919 |
Operating income |  |  | 209,969 |  |  |  | 369,260 |  |  |  | 368,363 |  |  |  | 408,952 |
Net income * |  |  | 109,257 |  |  |  | 321,299 |  |  |  | 277,846 |  |  |  | 301,306 |
Net income available to Units |  |  | 107,685 |  |  |  | 319,706 |  |  |  | 276,243 |  |  |  | 299,687 |
Earnings per Unit: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income available to Units - basic |  | $ | 0.28 |  |  | $ | 0.83 |  |  | $ | 0.72 |  |  | $ | 0.78 |
Net income available to Units - diluted |  | $ | 0.28 |  |  | $ | 0.83 |  |  | $ | 0.71 |  |  | $ | 0.77 |
|  | First Quarter |  |  | Second Quarter |  |  | Third Quarter |  |  | Fourth Quarter |
2018 (1) |  | 3/31 |  |  | 6/30 |  |  | 9/30 |  |  | 12/31 |
Total revenues |  | $ | 633,016 |  |  | $ | 639,808 |  |  | $ | 652,867 |  |  | $ | 652,743 |
Operating income |  |  | 339,082 |  |  |  | 217,603 |  |  |  | 339,403 |  |  |  | 219,282 |
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: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income available to Units - basic |  | $ | 0.57 |  |  | $ | 0.31 |  |  | $ | 0.58 |  |  | $ | 0.32 |
Net income available to Units - diluted |  | $ | 0.57 |  |  | $ | 0.31 |  |  | $ | 0.58 |  |  | $ | 0.31 |
* The Operating Partnership did not have any discontinued operations, extraordinary items or cumulative effect of change in accounting principle during the periods presented. 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.
| (1) | Amounts may not equal full year results due to rounding.

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