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Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Unaudited Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | $ 2,578,434 | $ 2,471,406 | $ 2,425,800
Operating income |  |  |  |  |  |  |  |  | 858,560 | 847,471 | 856,086
Net income |  |  |  |  |  |  |  |  | 685,192 | 628,381 | 4,480,104
Net income available to Common Shares |  |  |  |  |  |  |  |  | $ 654,445 | $ 600,363 | $ 4,289,072
Earnings per share – basic: |  |  |  |  |  |  |  |  |  |  |
Net income available to Common Shares |  |  |  |  |  |  |  |  | $ 1.78 | $ 1.64 | $ 11.75
Weighted average Common Shares outstanding |  |  |  |  |  |  |  |  | 368,052 | 366,968 | 365,002
Earnings per share – diluted: |  |  |  |  |  |  |  |  |  |  |
Net income available to Common Shares |  |  |  |  |  |  |  |  | $ 1.77 | $ 1.63 | $ 11.68
Weighted average Common Shares outstanding |  |  |  |  |  |  |  |  | 383,695 | 382,678 | 381,992
ERPOP [Member] |  |  |  |  |  |  |  |  |  |  |
Unaudited Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | $ 2,578,434 | $ 2,471,406 | $ 2,425,800
Operating income |  |  |  |  |  |  |  |  | 858,560 | 847,471 | 856,086
Net income |  |  |  |  |  |  |  |  | 685,192 | 628,381 | 4,480,104
Net income available to Units |  |  |  |  |  |  |  |  | $ 679,384 | $ 622,967 | $ 4,460,583
Earnings per share – basic: |  |  |  |  |  |  |  |  |  |  |
Net income available to Common Shares |  |  |  |  |  |  |  |  | $ 1.78 | $ 1.64 | $ 11.75
Weighted average Units outstanding |  |  |  |  |  |  |  |  | 380,921 | 379,869 | 378,829
Earnings per share – diluted: |  |  |  |  |  |  |  |  |  |  |
Net income available to Common Shares |  |  |  |  |  |  |  |  | $ 1.77 | $ 1.63 | $ 11.68
Weighted average Common Shares outstanding |  |  |  |  |  |  |  |  | 383,695 | 382,678 | 381,992
Scenario, Previously Reported [Member] |  |  |  |  |  |  |  |  |  |  |
Unaudited Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues | $ 652,743 | $ 652,867 | $ 639,808 | $ 633,016 | $ 630,704 | $ 624,122 | $ 612,480 | $ 604,100 |  |  |
Operating income | 219,306 | 224,731 | 217,654 | 196,869 | 214,764 | 217,786 | 210,550 | 204,371 |  |  |
Net income | 122,388 | 223,846 | 118,410 | 220,548 | 130,084 | 144,196 | 204,160 | 149,941 |  |  |
Net income available to Common Shares | $ 116,415 | $ 214,164 | $ 112,830 | $ 211,036 | $ 124,669 | $ 137,457 | $ 195,268 | $ 142,969 |  |  |
Earnings per share – basic: |  |  |  |  |  |  |  |  |  |  |
Net income available to Common Shares | $ 0.32 | $ 0.58 | $ 0.31 | $ 0.57 | $ 0.34 | $ 0.37 | $ 0.53 | $ 0.39 |  |  |
Weighted average Common Shares outstanding | 368,445 | 368,028 | 367,930 | 367,800 | 367,442 | 366,996 | 366,820 | 366,605 |  |  |
Earnings per share – diluted: |  |  |  |  |  |  |  |  |  |  |
Net income available to Common Shares | $ 0.31 | $ 0.58 | $ 0.31 | $ 0.57 | $ 0.34 | $ 0.37 | $ 0.53 | $ 0.39 |  |  |
Weighted average Common Shares outstanding | 384,296 | 383,884 | 383,423 | 383,018 | 383,105 | 382,945 | 382,692 | 382,280 |  |  |
Scenario, Previously Reported [Member] | ERPOP [Member] |  |  |  |  |  |  |  |  |  |  |
Unaudited Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues | $ 652,743 | $ 652,867 | $ 639,808 | $ 633,016 | $ 630,704 | $ 624,122 | $ 612,480 | $ 604,100 |  |  |
Operating income | 219,306 | 224,731 | 217,654 | 196,869 | 214,764 | 217,786 | 210,550 | 204,371 |  |  |
Net income | 122,388 | 223,846 | 118,410 | 220,548 | 130,084 | 144,196 | 204,160 | 149,941 |  |  |
Net income available to Units | $ 120,837 | $ 222,323 | $ 117,129 | $ 219,095 | $ 129,342 | $ 142,623 | $ 202,622 | $ 148,380 |  |  |
Earnings per share – basic: |  |  |  |  |  |  |  |  |  |  |
Net income available to Common Shares | $ 0.32 | $ 0.58 | $ 0.31 | $ 0.57 | $ 0.34 | $ 0.37 | $ 0.53 | $ 0.39 |  |  |
Weighted average Units outstanding | 381,306 | 380,912 | 380,795 | 380,663 | 380,325 | 379,906 | 379,733 | 379,504 |  |  |
Earnings per share – diluted: |  |  |  |  |  |  |  |  |  |  |
Net income available to Common Shares | $ 0.31 | $ 0.58 | $ 0.31 | $ 0.57 | $ 0.34 | $ 0.37 | $ 0.53 | $ 0.39 |  |  |
Weighted average Units outstanding | 384,296 | 383,884 | 383,423 | 383,018 | 383,105 | 382,945 | 382,692 | 382,280 |  |  |

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