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Pension Benefits (Schedule Of Components Of Pension Cost) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Retirement Benefits [Abstract]
Service cost	$ 50	$ 70	$ 102	$ 137
Interest cost	70	68	143	133
Amortization of actuarial loss	46	60	92	118
Total periodic cost	$ 166	$ 198	$ 337	$ 388

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