Benefit Plans (Details 1) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Beginning balance	$ 3,182	$ 2,957	$ 2,760
Expense recorded	445	387	359
Other comprehensive income recorded	(68)	(14)	(39)
Ending balance	3,465	3,182	2,957
Other Postretirement Benefit Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Beginning balance	876	840	856
Expense recorded	23	50	23
Other comprehensive income recorded	(68)	(14)	(39)
Ending balance	$ 831	$ 876	$ 840