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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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