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Earnings Per Common Share (Schedule Of Net Income (Loss) Per Common Share) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Earnings Per Common Share [Abstract]    
Net income (loss) $ 348,900 $ 210,318
Less: dividends declared-common shares and nonvested common shares (57,137) (53,240)
Undistributed earnings $ 291,763 $ 157,078
Percentage allocated to common shareholders 99.00% 98.90%
Net income (loss) available to common stockholders, total $ 288,706 $ 155,410
Add: dividends declared-common shareholders 56,531 52,697
Numerator for basic and diluted earnings per common share $ 345,237 $ 208,107
Denominator for basic earnings per weighted-average common shares 40,304 40,469
Effect of dilutive securities: Options 141 220
Denominator for diluted earnings per adjusted weighted-average common shares 40,445 40,689
Basic $ 8.57 $ 5.14
Diluted $ 8.54 $ 5.11
Basic weighted-average common shares outstanding 40,304 40,469
Basic weighted-average common shares outstanding and nonvested common shares expected to vest 40,731 40,903