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Summary Of Significant Accounting Policies (Net Income (Loss) Per Common Share) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Summary Of Significant Accounting Policies [Abstract]      
Net income (loss) $ 1,379,083 $ 514,151 $ 1,009,461
Less: dividends declared-common shares and unvested common shares (246,699) (249,056) (234,322)
Undistributed earnings $ 1,132,384 $ 265,094 $ 775,139
Percentage Allocated To Common Shareholders 98.70% 98.70% 98.90%
Net income (loss) available to common stockholders, total $ 1,117,318 $ 261,770 $ 766,386
Add: dividends declared-common shareholders 243,569 246,054 231,796
Numerator for basic and diluted earnings per common share $ 1,360,887 $ 507,824 $ 998,182
Denominator for basic earnings per weighted-average common shares 39,263 39,656 40,291
Effect of dilutive securities: Options 41 77 129
Denominator for diluted earnings per adjusted weighted-average common shares 39,304 39,734 40,420
Basic $ 34.66 $ 12.81 $ 24.77
Diluted $ 34.62 $ 12.78 $ 24.70
Basic weighted-average common shares outstanding 39,263 39,656 40,291
Basic weighted-average common shares outstanding and unvested common shares expected to vest 39,792 40,160 40,751