Pension Plan (Details) - Components of the net periodic pension cost - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Components of the net periodic pension cost [Abstract]
Interest cost	$ 121	$ 144	$ 241	$ 288
Expected return on plan assets	(168)	(169)	(336)	(338)
Amortization of net actuarial loss	48	140	96	280
Net periodic pension cost	$ 1	$ 115	$ 1	$ 230