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Revisions To Financial Statements (Schedule Of Prior Period Financial Statements - Stockholder's Equity) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Error Corrections And Prior Period Adjustments Restatement [Line Items]    
Balance $ 9,132,925  
Net income (loss) 16,612 $ 354,551
Balance 8,580,944 8,389,273
Retained Earnings [Member]    
Error Corrections And Prior Period Adjustments Restatement [Line Items]    
Balance 10,306,571 9,531,433
Net income (loss) 16,612 354,551
Balance $ 10,255,692 9,828,847
As Previously Reported [Member]    
Error Corrections And Prior Period Adjustments Restatement [Line Items]    
Net income (loss)   348,900
As Previously Reported [Member] | Retained Earnings [Member]    
Error Corrections And Prior Period Adjustments Restatement [Line Items]    
Balance   9,574,440
Net income (loss)   348,900
Balance   9,866,203
Impact of Revisions [Member]    
Error Corrections And Prior Period Adjustments Restatement [Line Items]    
Net income (loss)   5,651
Impact of Revisions [Member] | Retained Earnings [Member]    
Error Corrections And Prior Period Adjustments Restatement [Line Items]    
Balance   (43,007)
Net income (loss)   5,651
Balance   $ (37,356)