Pension Plan (Details) - Components of the net periodic pension cost - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Components of the net periodic pension cost [Abstract]
Interest cost	$ 144	$ 158	$ 288	$ 282
Expected return on plan assets	(169)	(174)	(338)	(299)
Amortization of net actuarial loss	140	47	280	178
Net periodic pension cost	$ 115	$ 31	$ 230	$ 161