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Earnings Per Share (Schedule Of Computation Of Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Earnings Per Share [Abstract]
Earnings	$ 268,550	$ 319,466	$ 219,923
Diluted earnings	$ 268,550	$ 319,466	$ 219,923
Earnings, Shares	15,671	15,955	15,969
Dilutive stock options, Shares	221	368	480
Nonvested stock awards, Shares	46	75	78
Diluted earnings, Shares	15,938	16,398	16,527
Earnings, Earnings per Share	$ 17.14	$ 20.02	$ 13.77
Diluted earnings, Earnings per Share	$ 16.85	$ 19.48	$ 13.31

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