Stock-Based Compensation (Summary Of Stock Option Transactions) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercised, Shares	(3,026)	(2,917)	(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					(5,943)
Outstanding at end of period, Shares	886,010				886,010
Exercisable at end of period, Shares	763,196				763,196
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					35.21
Outstanding at end of period, Weighted Average Exercise Price	$ 37.04				37.04
Exercisable at end of period, Weighted Average Exercise Price	$ 35.71				$ 35.71
Outstanding at end of period, Weighted Average Remaining Life (years)					6 years
Exercisable at end of period, Weighted Average Remaining Life (years)					5 years 6 months
Outstanding at end of period, Aggregate Intrinsic Value	$ 3,347				$ 3,347
Exercisable at end of period, Aggregate Intrinsic Value	$ 3,347				$ 3,347