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Earnings Per Common Share (Schedule Of Net Income (Loss) Per Common Share) (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Earnings Per Common Share [Abstract]        
Net income (loss) $ (73,468,000) $ 243,057,000 $ 948,376,000 $ 450,549,000
Less: dividends declared-common shares and unvested common shares (61,457,000) (61,910,000) (185,731,000) (187,115,000)
Undistributed earnings $ (134,925,000) $ 181,148,000 $ 762,646,000 $ 263,435,000
Percentage allocated to common shareholders 100.00% 98.80% 98.70% 98.70%
Net income (loss) available to common stockholders, total $ (134,925,000) $ 178,938,000 $ 752,414,000 $ 260,096,000
Add: dividends declared-common shareholders 61,457,000 61,199,000 183,333,000 184,836,000
Numerator for basic and diluted earnings per common share $ (73,468,000) $ 240,138,000 $ 935,748,000 $ 444,931,000
Denominator for basic earnings per weighted-average common shares 39,161,000 39,483,000 39,409,000 39,711,000
Effect of dilutive securities: Options 36,000 74,000 44,000 79,000
Denominator for diluted earnings per adjusted weighted-average common shares 39,197,000 39,557,000 39,452,000 39,790,000
Per common share net income (loss)        
Basic $ (1.88) $ 6.08 $ 23.74 $ 11.20
Diluted $ (1.88) $ 6.07 $ 23.72 $ 11.18
Basic weighted-average common shares outstanding 39,161,000 39,483,000 39,409,000 39,711,000
Basic weighted-average common shares outstanding and unvested common shares expected to vest 39,161,000 39,971,000 39,945,000 40,221,000