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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		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Earnings Per Share [Abstract]
Earnings	$ 74,958	$ 56,873	$ 182,456	$ 187,498
Diluted earnings	$ 74,958	$ 56,873	$ 182,456	$ 187,498
Earnings, Shares	15,075	14,888	15,034	14,935
Dilutive stock options, Shares	82	118	98	140
Nonvested stock awards, Shares	43	36	46	39
Diluted earnings, Shares	15,200	15,042	15,178	15,114
Earnings, Earnings per Share	$ 4.97	$ 3.82	$ 12.14	$ 12.55
Diluted earnings, Earnings per Share	$ 4.93	$ 3.78	$ 12.02	$ 12.41

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