Pension And Postretirement Benefit Plans (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($) employee	Sep. 30, 2015 USD ($)
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)	$ 0	$ (2)	$ (1)