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Stock-Based Compensation (Summary Of Compensation Costs) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Performance Share Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation within operations and maintenance expenses	$ 986	$ 1,039	$ 2,174	$ 5,444
Income tax benefit	248	260	545	1,364
Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation within operations and maintenance expenses	508	746	2,078	2,186
Income tax benefit	128	187	521	548
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation within operations and maintenance expenses	32	181	233	480
Income tax benefit	8	45	58	120
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation within operations and maintenance expenses	13	12	37	37
Income tax benefit	$ 3	$ 3	10	10
Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation within operations and maintenance expenses			840	780
Income tax benefit			$ 233	$ 219

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- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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