Stock-Based Compensation and Directors Stock Purchase Plan (Summary Of SAR Activity) (Details) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($) $ / shares shares
Stock Appreciation Rights, Shares [Roll Forward]
Outstanding, Shares, Beginning Balance | shares	995,591
Granted, Shares | shares	94,173
Forfeited, Shares | shares	(5,250)
Expired, Shares | shares	(6,114)
Exercised, Shares | shares	(55,079)
Outstanding, Shares, Ending Balance | shares	1,023,321
Exercisable, Shares, Ending Balance | shares	786,452
Stock Appreciation Rights, Weighted Average Exercise Price [Roll Forward]
Outstanding, Weighted Average Exercise Price, Beginning Balance | $ / shares	$ 44.59
Share based compensation arrangement by share based payment award equity instruments other than options grants in period weighted average exercise price | $ / shares	62.52
Share-based Compensation Arrangement by Share-based Payment Award, Other than Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price | $ / shares	60.99
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Expired In Period Weighted Average Exercise Price | $ / shares	49.63
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Exercised In Period Weighted Average Exercise Price | $ / shares	26.33
Outstanding, Weighted Average Exercise Price, Ending Balance | $ / shares	47.10
Exercisable, Weighted Average Exercise Price, Ending Balance | $ / shares	$ 42.66
Outstanding, Weighted Average Remaining Contractual Term (in years)	4 years 9 months 18 days
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Outstanding | $	$ 9,189
Exercisable, Weighted Average Remaining Contractual Term (in years)	3 years 10 months 24 days
Exercisable, Aggregate Intrinsic Value, Ending Balance | $	$ 9,132