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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)