Stock-Based Compensation (Summary Of Stock Option Transactions) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercised, Shares	(4,971)	(2,917)
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding at beginning of period, Shares	882,442
Granted, Shares	119,548
Expired, Shares	(527)
Exercised, Shares	(4,971)
Outstanding at end of period, Shares	996,492
Exercisable at end of period, Shares	803,853
Outstanding at beginning of period, Weighted Average Exercise Price	$ 37.03
Granted, Weighted Average Exercise Price	35.78
Expired, Weighted Average Exercise Price	35.94
Exercised, Weighted Average Exercise Price	35.25
Outstanding at end of period, Weighted Average Exercise Price	36.89
Exercisable at end of period, Weighted Average Exercise Price	$ 36.29
Outstanding at end of period, Weighted Average Remaining Life (years)	5 years 9 months 18 days
Exercisable at end of period, Weighted Average Remaining Life (years)	5 years
Outstanding at end of period, Aggregate Intrinsic Value	$ 1,380
Exercisable at end of period, Aggregate Intrinsic Value	$ 1,228