Pension Plan (Details) - Components of the net periodic pension cost - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Components of the net periodic pension cost [Abstract]
Interest cost	$ 144	$ 140	$ 432	$ 422
Expected return on plan assets	(169)	(150)	(507)	(449)
Amortization of net actuarial loss	140	90	420	268
Net periodic pension cost	$ 115	$ 80	$ 345	$ 241