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Pension And Postretirement Benefit Plans (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($) employee	Sep. 30, 2016 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Retired employees receiving health care and life insurance benefits \| employee			9
Post retirement benefits, age eligibility requirement			65 years
Post retirement benefits, service eligibility requirement			15 years
Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Net periodic benefit cost \| $	$ (1)	$ (1)	$ (3)	$ (2)