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Earnings Per Common Share (Schedule Of Net Income (Loss) Per Common Share) (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Earnings Per Common Share [Abstract]        
Net income (loss) $ 679,982,000 $ 190,880,000 $ 1,021,844,000 $ 207,492,000
Less: dividends declared-common shares and nonvested common shares (62,045,000) (61,927,000) (124,274,000) (125,205,000)
Undistributed earnings $ 617,937,000 $ 128,953,000 $ 897,570,000 $ 82,287,000
Percentage allocated to common shareholders 98.60% 98.70% 98.70% 98.70%
Net income (loss) available to common stockholders, total $ 609,411,000 $ 127,233,000 $ 885,595,000 $ 81,224,000
Add: dividends declared-common shareholders 61,245,000 61,148,000 122,659,000 123,637,000
Numerator for basic and diluted earnings per common share $ 670,656,000 $ 188,381,000 $ 1,008,254,000 $ 204,861,000
Denominator for basic earnings per weighted-average common shares 39,527,000 39,449,000 39,535,000 39,827,000
Effect of dilutive securities: Options 41,000 69,000 48,000 81,000
Denominator for diluted earnings per adjusted weighted-average common shares 39,567,000 39,519,000 39,582,000 39,908,000
Per common share net income (loss)        
Basic $ 16.97 $ 4.78 $ 25.50 $ 5.14
Diluted $ 16.95 $ 4.77 $ 25.47 $ 5.13
Basic weighted-average common shares outstanding 39,527,000 39,449,000 39,535,000 39,827,000
Basic weighted-average common shares outstanding and nonvested common shares expected to vest 40,080,000 39,983,000 40,069,000 40,348,000