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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
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Earnings Per Common Share [Abstract]        
Net income (loss) $ 342,855 $ 69,895 $ 691,755 $ 280,213
Less: dividends declared-common shares and nonvested common shares (56,999) (53,240) (114,136) (106,480)
Undistributed earnings $ 285,856 $ 16,655 $ 577,619 $ 173,733
Percentage allocated to common shareholders 98.90% 98.90% 98.90% 98.90%
Net income (loss) available to common stockholders, total $ 282,624 $ 16,477 $ 571,326 $ 171,881
Add: dividends declared-common shareholders 56,394 52,705 112,925 105,403
Numerator for basic and diluted earnings per common share $ 339,018 $ 69,183 $ 684,251 $ 277,284
Denominator for basic earnings per weighted-average common shares 40,277,000 40,504,000 40,291,000 40,487,000
Effect of dilutive securities: Options 126,000 206,000 134,000 213,000
Denominator for diluted earnings per adjusted weighted-average common shares 40,404,000 40,710,000 40,425,000 40,699,000
Basic $ 8.42 $ 1.71 $ 16.98 $ 6.85
Diluted $ 8.39 $ 1.70 $ 16.93 $ 6.81
Basic weighted-average common shares outstanding 40,277,000 40,504,000 40,291 40,487,000
Basic weighted-average common shares outstanding and nonvested common shares expected to vest 40,738,000 40,943,000 40,735 40,923,000