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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
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Jun. 30, 2019
Jun. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
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 $ 8,208,613 $ 8,320,552 $ 8,340,736 $ 7,860,797 $ 8,340,736 $ 7,860,797 $ 8,340,736 $ 8,340,736  
Net income (loss) 104,398 332,868 354,551 198,381 60,787 215,186 687,419 275,973 791,817 474,354 89,041 $ 482,751
Balance 8,983,258 8,836,817 8,389,273 8,289,045 8,208,613 8,320,552 8,836,817 8,208,613 8,983,258 8,289,045 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 9,828,106 9,820,559 9,657,412 9,531,433 9,657,412 9,531,433 9,657,412 9,657,412 9,380,653
Net income (loss) 104,398 332,868 354,551 198,381 60,787 215,186   275,973   474,354 89,041 482,751
Balance 10,152,118 10,104,716 9,828,847 9,973,624 9,828,106 9,820,559 10,104,716 9,828,106 10,152,118 9,973,624 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 8,241,349 8,344,180 8,369,232 7,903,804 8,369,232 7,903,804 8,369,232 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 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 9,860,842 9,844,187 9,685,908 9,574,440 9,685,908 9,574,440 9,685,908 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 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) (32,736) (23,628) (28,496) (43,007) (28,496) (43,007) (28,496) (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) (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) (32,736) (23,628) (28,496) (43,007) (28,496) $ (43,007) (28,496) (28,496) (42,279)
Net income (loss)   (9,987) 5,651 (7,232) (9,108) 4,868 (9,987) (4,240)   (11,472) (14,511) 13,783
Balance   $ (47,343) $ (37,356) $ (39,968) $ (32,736) $ (23,628) $ (47,343) $ (32,736)   $ (39,968) $ (43,007) $ (28,496)