Benefit Plans (Details 1) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Beginning balance	$ 2,760	$ 2,549	$ 2,396
Expense recorded	359	369	308
Other comprehensive loss (income) recorded	(39)	108	(45)
Ending balance	2,957	2,760	2,549
Other Postretirement Benefit Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Beginning balance	856	616	614
Expense recorded	23	132	47
Other comprehensive loss (income) recorded	(39)	108	(45)
Ending balance	$ 840	$ 856	$ 616