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Earnings Per Share (Schedule Of Computation Of Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Earnings Per Share [Abstract]
Earnings	$ 64,169	$ 65,400
Diluted earnings	$ 64,169	$ 65,400
Earnings, Shares	14,986	16,010
Dilutive stock options, Shares	165	250
Nonvested stock awards, Shares	41	50
Diluted earnings, Shares	15,192	16,310
Earnings, Earnings per Share	$ 4.28	$ 4.08
Diluted earnings, Earnings per Share	$ 4.22	$ 4.01

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