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Earnings Per Common Share (Schedule Of Net Income (Loss) Per Common Share) (Details) - USD ($)
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Earnings Per Common Share [Abstract]    
Net income (loss) $ 297,751,000 $ 341,862,000
Less: dividends declared-common shares and unvested common shares (61,097,000) (62,229,000)
Undistributed earnings $ 236,653,000 $ 279,633,000
Percentage allocated to common shareholders 98.70% 98.70%
Net income (loss) available to common stockholders, total $ 233,504,000 $ 276,031,000
Add: dividends declared-common shareholders 60,282,000 61,415,000
Numerator for basic and diluted earnings per common share $ 293,785,000 $ 337,446,000
Denominator for basic earnings per weighted-average common shares 38,823,000 39,543,000
Effect of dilutive securities: Options 14,000 54,000
Denominator for diluted earnings per adjusted weighted-average common shares 38,837,000 39,597,000
Per common share net income (loss)    
Basic $ 7.57 $ 8.53
Diluted $ 7.56 $ 8.52
Basic weighted-average common shares outstanding 38,823,000 39,543,000
Basic weighted-average common shares outstanding and unvested common shares expected to vest 39,347,000 40,059,000