Pension Plan (Details) - Components of the net periodic pension cost - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Components of the net periodic pension cost [Abstract]
Interest cost	$ 487	$ 573
Expected return on plan assets	(672)	(667)
Amortization of net actuarial loss	199	579
Net periodic pension cost	$ 14	$ 485