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Pension Benefits (Schedule Of Components Of Pension Cost) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Retirement Benefits [Abstract]
Service cost	$ 49	$ 75	$ 151	$ 212
Interest cost	69	72	212	205
Amortization of actuarial loss	44	64	134	182
Total periodic cost	$ 162	$ 211	$ 497	$ 599

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