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Revisions To Financial Statements (Schedule Of Prior Period Financial Statements - Stockholder's Equity) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Sep. 30, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Error Corrections And Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance |  | $ 8,836,817 | $ 8,389,273 | $ 7,860,797 | $ 8,289,045 | $ 8,208,613 | $ 8,320,552 | $ 8,340,736 | $ 7,860,797 | $ 8,340,736 | $ 8,340,736 | $ 7,860,797 | $ 8,340,736 |
Net income (loss) | $ 217,644 | 104,398 | 332,868 | 354,551 | (385,313) | 198,381 | 60,787 | 215,186 | 687,419 | 275,973 | 474,354 | 1,009,461 | 89,041 | $ 482,751
Balance | 9,132,925 |  | 8,836,817 | 8,389,273 | 7,860,797 | 8,289,045 | 8,208,613 | 8,320,552 | 8,836,817 | 8,208,613 | 8,289,045 | 9,132,925 | 7,860,797 | 8,340,736
Retained Earnings [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Error Corrections And Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance |  | 10,104,716 | 9,828,847 | 9,531,433 | 9,973,624 | 9,828,106 | 9,820,559 | 9,657,412 | 9,531,433 | 9,657,412 | 9,657,412 | 9,531,433 | 9,657,412 | 9,380,653
Net income (loss) |  |  | 332,868 | 354,551 |  | 198,381 | 60,787 | 215,186 |  | 275,973 | 474,354 | 1,009,461 | 89,041 | 482,751
Balance | $ 10,306,571 |  | 10,104,716 | 9,828,847 | 9,531,433 | 9,973,624 | 9,828,106 | 9,820,559 | 10,104,716 | 9,828,106 | 9,973,624 | 10,306,571 | 9,531,433 | 9,657,412
As Previously Reported [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Error Corrections And Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance |  | 8,884,160 | 8,426,629 | 7,903,804 | 8,329,013 | 8,241,349 | 8,344,180 | 8,369,232 | 7,903,804 | 8,369,232 | 8,369,232 | 7,903,804 | 8,369,232 |
Net income (loss) |  |  | 342,855 | 348,900 |  | 205,613 | 69,895 | 210,318 | 691,755 | 280,213 | 485,826 |  | 103,552 | 468,968
Balance |  |  | 8,884,160 | 8,426,629 | 7,903,804 | 8,329,013 | 8,241,349 | 8,344,180 | 8,884,160 | 8,241,349 | 8,329,013 |  | 7,903,804 | 8,369,232
As Previously Reported [Member] | Retained Earnings [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Error Corrections And Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance |  | 10,152,059 | 9,866,203 | 9,574,440 | 10,013,592 | 9,860,842 | 9,844,187 | 9,685,908 | 9,574,440 | 9,685,908 | 9,685,908 | 9,574,440 | 9,685,908 | 9,422,932
Net income (loss) |  |  | 342,855 | 348,900 |  | 205,613 | 69,895 | 210,318 |  | 280,213 | 485,826 |  | 103,552 | 468,968
Balance |  |  | 10,152,059 | 9,866,203 | 9,574,440 | 10,013,592 | 9,860,842 | 9,844,187 | 10,152,059 | 9,860,842 | 10,013,592 |  | 9,574,440 | 9,685,908
Impact of Revisions [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Error Corrections And Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance |  | (47,343) | (37,356) | (43,007) | (39,968) | (32,736) | (23,628) | (28,496) | (43,007) | (28,496) | (28,496) | (43,007) | (28,496) |
Net income (loss) |  |  | (9,987) | 5,651 |  | (7,232) | (9,108) | 4,868 | (4,336) | (4,240) | (11,472) |  | (14,511) | 13,783
Balance |  |  | (47,343) | (37,356) | (43,007) | (39,968) | (32,736) | (23,628) | (47,343) | (32,736) | (39,968) |  | (43,007) | (28,496)
Impact of Revisions [Member] | Retained Earnings [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Error Corrections And Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance |  | $ (47,343) | (37,356) | (43,007) | (39,968) | (32,736) | (23,628) | (28,496) | (43,007) | (28,496) | (28,496) | $ (43,007) | (28,496) | (42,279)
Net income (loss) |  |  | (9,987) | 5,651 |  | (7,232) | (9,108) | 4,868 |  | (4,240) | (11,472) |  | (14,511) | 13,783
Balance |  |  | $ (47,343) | $ (37,356) | $ (43,007) | $ (39,968) | $ (32,736) | $ (23,628) | $ (47,343) | $ (32,736) | $ (39,968) |  | $ (43,007) | $ (28,496)

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