Stock-Based Compensation (Summary Of Nonvested Share Activity) (Details) - $ / shares	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	Sep. 30, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted, Number of Share Units	133	17,054	222,782	6,555	4,736	57,052
Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Nonvested share units at beginning of period, Number of Share Units
Granted, Number of Share Units							18,676
Actual vested, Number of share Units							(18,676)
Nonvested share units at end of period, Number of Share Units
Nonvested share units at beginning of period, Weighted Average Fair Value
Granted, Weighted Average Fair Value							41.78	$ 46.40
Actual vested, Weighted Average Fair Value							(41.78)
Nonvested share units at end of period, Weighted Average Fair Value