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Earnings Per Common Share (Schedule Of Net Income (Loss) Per Common Share) (Details) - USD ($)
$ / shares in Units, $ 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
Earnings Per Common Share [Abstract]                        
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
Less: dividends declared-common shares and nonvested common shares (56,995)     (52,863)         (171,131) (159,343)    
Undistributed earnings $ 47,403     $ 145,519         $ 620,687 $ 315,012    
Percentage allocated to common shareholders 98.90%     99.00%         98.90% 98.90%    
Net income (loss) available to common stockholders, total $ 46,869     $ 144,024         $ 613,847 $ 311,695    
Add: dividends declared-common shareholders 56,403     52,356         169,329 157,759    
Numerator for basic and diluted earnings per common share $ 103,273     $ 196,379         $ 783,176 $ 469,454    
Denominator for basic earnings per weighted-average common shares 40,287,000     40,350,000         40,289,000 40,441,000    
Effect of dilutive securities: Options 125,000     192,000         131,000 206,000    
Denominator for diluted earnings per adjusted weighted-average common shares 40,411,000     40,542,000         40,421,000 40,646,000    
Basic $ 2.56 $ 8.17 $ 8.70 $ 4.87 $ 1.49 $ 5.26 $ 16.88 $ 6.75 $ 19.44 $ 11.61 $ 2.18 $ 11.77
Diluted $ 2.56 $ 8.15 $ 8.67 $ 4.84 $ 1.48 $ 5.23 $ 16.82 $ 6.71 $ 19.38 $ 11.55 $ 2.17 $ 11.70
Basic weighted-average common shares outstanding 40,287,000     40,350,000         40,289 40,441,000    
Basic weighted-average common shares outstanding and nonvested common shares expected to vest 40,746,000     40,769,000         40,738 40,871,000