Pension Plan (Details) - Components of net periodic pension cost - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Components of net periodic pension cost [Abstract]
Interest cost	$ 124	$ 144	$ 365	$ 432
Expected return on plan assets	(168)	(169)	(504)	(507)
Amortization of net actuarial loss	53	140	149	420
Net periodic pension cost	$ 9	$ 115	$ 10	$ 345