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, 2024	Mar. 31, 2023
Earnings Per Share [Abstract]
Earnings	$ 65,017	$ 54,121
Diluted earnings	$ 65,017	$ 54,121
Earnings, Shares	15,121	14,966
Dilutive stock options, Shares	162	94
Nonvested stock awards, Shares	56	50
Diluted earnings, Shares	15,339	15,110
Earnings, Earnings per Share	$ 4.30	$ 3.62
Diluted earnings, Earnings per Share	$ 4.24	$ 3.58