Stock-Based Compensation (Summary Of Stock Option Transactions) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercised, Shares	(610)	(3,026)	(2,917)	(18,992)	(6,462)	(28,516)
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding at beginning of period, Shares			820,061				820,061
Granted, Shares							74,632
Forfeited, Shares							(2,076)
Expired, Shares							(664)
Exercised, Shares							(6,553)
Outstanding at end of period, Shares	885,400						885,400
Exercisable at end of period, Shares	762,586						762,586
Outstanding at beginning of period, Weighted Average Exercise Price			$ 36.29				$ 36.29
Granted, Weighted Average Exercise Price							45.39
Forfeited, Weighted Average Exercise Price							45.31
Expired, Weighted Average Exercise Price							35.20
Exercised, Weighted Average Exercise Price							34.98
Outstanding at end of period, Weighted Average Exercise Price	$ 37.04						37.04
Exercisable at end of period, Weighted Average Exercise Price	$ 35.72						$ 35.72
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 3 months 18 days
Outstanding at end of period, Aggregate Intrinsic Value	$ 206						$ 206
Exercisable at end of period, Aggregate Intrinsic Value	$ 206						$ 206