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Benefit Plans (Schedule Of Benefit Plans) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Pension Costs
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 574	$ 498	$ 1,724	$ 1,494
Interest cost	1,316	1,239	3,948	3,721
Expected return on plan assets	(1,339)	(1,502)	(4,015)	(4,506)
Net cost	551	235	1,657	709
Postretirement Costs
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	3	0	3
Interest cost	236	229	717	731
Net cost	$ 236	$ 232	$ 717	$ 734

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Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan.

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