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Summary Of Significant Accounting Policies (Net Income (Loss) Per Common Share) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Summary Of Significant Accounting Policies [Abstract]                      
Net income (loss) $ 63,601 $ 243,057 $ 190,880 $ 16,612 $ 217,644 $ 104,398 $ 332,868 $ 354,551 $ 514,151 $ 1,009,461 $ 89,041
Less: dividends declared-common shares and nonvested common shares                 (249,056) (234,322) (216,221)
Undistributed earnings                 $ 265,094 $ 775,139 $ (127,180)
Percentage allocated to common shareholders                 98.70% 98.90% 99.00%
Net income (loss) available to common stockholders, total                 $ 261,770 $ 766,386 $ (125,848)
Add: dividends declared-common shareholders                 246,054 231,796 214,088
Numerator for basic and diluted earnings per common share                 $ 507,824 $ 998,182 $ 88,239
Denominator for basic earnings per weighted-average common shares                 39,656 40,291 40,388
Effect of dilutive securities: Options                 77 129 198
Denominator for diluted earnings per adjusted weighted-average common shares                 39,734 40,420 40,586
Basic $ 1.59 $ 6.08 $ 4.78 $ 0.41 $ 5.34 $ 2.56 $ 8.17 $ 8.70 $ 12.81 $ 24.77 $ 2.18
Diluted $ 1.59 $ 6.07 $ 4.77 $ 0.41 $ 5.32 $ 2.56 $ 8.15 $ 8.67 $ 12.78 $ 24.70 $ 2.17
Basic weighted-average common shares outstanding                 39,656 40,291 40,388
Basic weighted-average common shares outstanding and nonvested common shares expected to vest                 40,160 40,751 40,816