Pension Plan (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Components of net periodic pension cost [Abstract]
Interest cost	$ 67	$ 70	$ 134	$ 140
Expected return on plan assets	(94)	(98)	(188)	(196)
Amortization of actuarial loss	123	140	245	280
Net Periodic Pension Plan Cost	$ 96	$ 112	$ 191	$ 224