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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, 2021	Mar. 31, 2020
Earnings Per Share[Abstract]
Earnings	$ 65,400	$ 55,891
Diluted earnings	$ 65,400	$ 55,891
Earnings, Shares	16,010	15,991
Dilutive stock options, Shares	250	446
Nonvested stock awards, Shares	50	79
Diluted earnings, Shares	16,310	16,516
Earnings, Earnings per Share	$ 4.08	$ 3.50
Diluted earnings, Earnings per Share	$ 4.01	$ 3.38

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