Pension Plan (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Components of net periodic pension cost [Abstract]
Interest cost	$ 67	$ 70
Expected return on plan assets	(94)	(98)
Amortization of actuarial loss	122	140
Net Periodic Pension Plan Cost	$ 95	$ 112