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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 | 6 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Sep. 30, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Summary Of Significant Accounting Policies [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) | $ 217,644 | $ 104,398 | $ 332,868 | $ 354,551 | $ (385,313) | $ 198,381 | $ 60,787 | $ 215,186 | $ 687,419 | $ 275,973 | $ 474,354 | $ 1,009,461 | $ 89,041 | $ 482,751
Less: dividends declared-common shares and nonvested common shares |  |  |  |  |  |  |  |  |  |  |  | (234,322) | (216,221) | (207,242)
Undistributed earnings |  |  |  |  |  |  |  |  |  |  |  | $ 775,139 | $ (127,180) | $ 275,508
Percentage allocated to common shareholders |  |  |  |  |  |  |  |  |  |  |  | 98.90% | 99.00% | 98.90%
Net income (loss) available to common stockholders, total |  |  |  |  |  |  |  |  |  |  |  | $ 766,386 | $ (125,848) | $ 272,589
Add: dividends declared-common shareholders |  |  |  |  |  |  |  |  |  |  |  | 231,796 | 214,088 | 205,182
Numerator for basic and diluted earnings per common share |  |  |  |  |  |  |  |  |  |  |  | $ 998,182 | $ 88,239 | $ 477,771
Denominator for basic earnings per weighted-average common shares |  |  |  |  |  |  |  |  |  |  |  | 40,291 | 40,388 | 40,595
Effect of dilutive securities: Options |  |  |  |  |  |  |  |  |  |  |  | 129 | 198 | 248
Denominator for diluted earnings per adjusted weighted-average common shares |  |  |  |  |  |  |  |  |  |  |  | 40,420 | 40,586 | 40,843
Basic | $ 5.34 | $ 2.56 | $ 8.17 | $ 8.70 | $ (9.58) | $ 4.87 | $ 1.49 | $ 5.26 | $ 16.88 | $ 6.75 | $ 11.61 | $ 24.77 | $ 2.18 | $ 11.77
Diluted | $ 5.32 | $ 2.56 | $ 8.15 | $ 8.67 | $ (9.58) | $ 4.84 | $ 1.48 | $ 5.23 | $ 16.82 | $ 6.71 | $ 11.55 | $ 24.70 | $ 2.17 | $ 11.70
Basic weighted-average common shares outstanding |  |  |  |  |  |  |  |  |  |  |  | 40,291 | 40,388 | 40,595
Basic weighted-average common shares outstanding and nonvested common shares expected to vest |  |  |  |  |  |  |  |  |  |  |  | 40,751 | 40,816 | 41,030
Anti-dilutive options |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0

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