- Components of Net Period Benefit Cost (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Compensation and Retirement Disclosure [Abstract]
Service cost	$ 83	$ 75
Interest cost	2	3
Amortization of transition obligation	4	4
Prior service cost	(43)	(39)
Total pension expense	$ 46	$ 43